end of the klr experience nklr

[spike55_bmw]

I just returned from a 2,500 mile trip from PA (home base) to the Upper Peninsula of Michigan / Wisconsin. As the trip progressed my '06 KLR seemed like it developed a miss / on-off surging sensation (at steady throttle position) and got worse near the end of the trip. MPG were always 48+ to 53 - no deterioation as the trip progressed. I did look into some possible issues but no change so far. What I have noticed lately is that it seems like it is running out of gas at 5,500 rpms. I'll run 3rd gear up to that and maybe a little past, shift into 4th and the engine 'flutters' at 5,500 rpms at full throttle, it continues to flutter in 5th and the rpms will very slowly creep up still at full throttle. Not awe inspiring at this point - something is noticably wrong and slowly getting worse. 1.) I checked the valve clearances - all were well within spec 2.) I did take apart the carb but only to look at the major components (no jets removed) - nothing obviously broken / dirty / etc 3.) I did adjust the fuel / air mixture screw one-half turn more rich - no change - still backfiring on decel 4.) I cleaned an already clean air filter - no change 5.) I ran the bike with the cleaned air filter with the airbox hatch off - very load but no change 6.) I replaced the spark plug with standard and verified the gap - no change 7.) I made sure that the exhaust header bolts where tight - no change 8.) I checked the fuel tank breather tube system and it was free flowing 9.) While the engine was fluttering, I opened the gas cap - no change 10.) While the engine was fluttering, I opened and closed the choke - no change 11.) I ran the bike with the petcock set to reserve - no change I'm open for suggestions. I'm thinking: fuel or air, not timing because the engine will initially rev up and over 5,500 rpms but then seems to become 'starved' until you leave off the throttle and it can catch up. I still have the original vacuum line between the carb and petcock - maybe it is now leaking / collapsing under higher stress, thereby restricting fuel flow. I have not taken apart the petcock but maybe it isn't as free-flowing as it should be - not holding the vacuum to stay open or it has a partially clogged filter. I have not modified the carb other than making the fuel / air more rich but maybe more is needed. Don R100, A6F

[Dennis Griffin]

Sounds like lean surge to me. The worsening you mentioned could be due to gradual carbon buildup in the combustion chamber. This can lead to slightly higher compression and possibly some preignition that may or may not be audibly detected. I have always liked using a proper dose of Berrymans B12 in the fuel on occasion to combat this. Makes a good fuel dryer and helps keep the entire fuel system clean. Item 3 - Should affect low speed only. No effect to the air/fuel ratio at cruising speeds, which is determined by the main jet/needle sizes & relationship. Item 10 - I think the choke only works by supplying additional fuel in the idle circuit, not by restricting air flow like the old chokes did, so it doesn't surprise me that you didn't see a difference at highway speed with it actuated. You say you can accelerate up to the speed where the "flutter" is occurring in a lower gear without experiencing it. This says you are getting enough fuel under acceleration or loaded throttle. Lean surge at neutral to slightly loaded throttle and a moderate cruise speed, especially with a good tailwind, isn't uncommon on a current stock jetted bike. This condition is only aggravated by removing the filter door (Item 5) or using less restrictive air filters, including freshly cleaned. I would suggest putting a .020" shim under the needle clip as a cheap first step. R/C car shock washers are good for this . This would give you the opportunity to examine the diaphragm while you are in there, as a slightly torn or perforated one could be causing what you're experiencing (not lifting needle out of main jet enough). Also, while you have the slide in your hand is a good time to open up the small equalization hole in it. I seem to recall I went up by 1/32" over the existing hole size on my '06, which was only half the step up some recommended. Doing this will help the throttle response, but has nothing to do with the steady state air/fuel ratio. May be time to consider a DynoJet kit. Darn, I just reread your post and saw the full throttle part - I was thinking (and mostly addressing) neutral to light throttle condition. So I would definitely pull the carb and check the condition of the diaphragm and check for restriction or roughness in the action of the slide. Probably should double check your float level as well, and look for restriction in the fuel delivery path. Happy diagnosing, Dennis

On Sep 20, 2009, at 8:58 AM, spike55_bmw wrote: > I just returned from a 2,500 mile trip from PA (home base) to the > Upper Peninsula of Michigan / Wisconsin. As the trip progressed my > '06 KLR seemed like it developed a miss / on-off surging sensation > (at steady throttle position) and got worse near the end of the > trip. MPG were always 48+ to 53 - no deterioation as the trip > progressed. > > I did look into some possible issues but no change so far. What I > have noticed lately is that it seems like it is running out of gas > at 5,500 rpms. I'll run 3rd gear up to that and maybe a little past, > shift into 4th and the engine 'flutters' at 5,500 rpms at full > throttle, it continues to flutter in 5th and the rpms will very > slowly creep up still at full throttle. Not awe inspiring at this > point - something is noticably wrong and slowly getting worse. > > 1.) I checked the valve clearances - all were well within spec > 2.) I did take apart the carb but only to look at the major > components (no jets removed) - nothing obviously broken / dirty / etc > 3.) I did adjust the fuel / air mixture screw one-half turn more > rich - no change - still backfiring on decel > 4.) I cleaned an already clean air filter - no change > 5.) I ran the bike with the cleaned air filter with the airbox hatch > off - very load but no change > 6.) I replaced the spark plug with standard and verified the gap - > no change > 7.) I made sure that the exhaust header bolts where tight - no change > 8.) I checked the fuel tank breather tube system and it was free > flowing > 9.) While the engine was fluttering, I opened the gas cap - no change > 10.) While the engine was fluttering, I opened and closed the choke > - no change > 11.) I ran the bike with the petcock set to reserve - no change > > I'm open for suggestions. I'm thinking: fuel or air, not timing > because the engine will initially rev up and over 5,500 rpms but > then seems to become 'starved' until you leave off the throttle and > it can catch up. > > I still have the original vacuum line between the carb and petcock - > maybe it is now leaking / collapsing under higher stress, thereby > restricting fuel flow. I have not taken apart the petcock but maybe > it isn't as free-flowing as it should be - not holding the vacuum to > stay open or it has a partially clogged filter. > > I have not modified the carb other than making the fuel / air more > rich but maybe more is needed. > > Don R100, A6F [Non-text portions of this message have been removed]

[spike55_bmw]

Den: I did have the carb apart to look for a torn diaphragm and it seemed OK. I used some 'grease in the groove' to seat the diaphragm (BMW Airhead trick on the Bing carbs). I had the bowl off to look at the floats' action and that seemed OK too. I shot carb cleaner up & down all of the pin holes in the carb body - all passed the fluid. Again, inside & out looked very clean. I routinely (about every 5 tank-fills) use some Seafoam, or Marvel Mystery Oil, or some gas-line antifreeze (not together) to keep the fuel system and top end in shape. It seems like that regiment has done a good job so far. I truely am satisfied with the stock carb that matches the stock exhaust. I just want to get back to normal. Maybe I'll call the Harley dealer tomorrow to see if they have any carb parts (supposedly less expensive that going through Kawi - hard to believe considering its HD). But I really don't want to Dyna-Jet or drill anything out. Again, I seem to have enough fuel delivered to get up to 5,500 rpms in 3rd gear but by then I get this flutter / flat / very slow response at that same rpm in 4th and 5th gears with the throttle on full. Don R100, A6F

--- In DSN_KLR650@yahoogroups.com, Dennis Griffin wrote: > > Sounds like lean surge to me. The worsening you mentioned could be due > to gradual carbon buildup in the combustion chamber. This can lead to > slightly higher compression and possibly some preignition that may or > may not be audibly detected. I have always liked using a proper dose > of Berrymans B12 in the fuel on occasion to combat this. Makes a good > fuel dryer and helps keep the entire fuel system clean. > > Item 3 - Should affect low speed only. No effect to the air/fuel ratio > at cruising speeds, which is determined by the main jet/needle sizes & > relationship. > > Item 10 - I think the choke only works by supplying additional fuel in > the idle circuit, not by restricting air flow like the old chokes did, > so it doesn't surprise me that you didn't see a difference at highway > speed with it actuated. > > You say you can accelerate up to the speed where the "flutter" is > occurring in a lower gear without experiencing it. This says you are > getting enough fuel under acceleration or loaded throttle. Lean surge > at neutral to slightly loaded throttle and a moderate cruise speed, > especially with a good tailwind, isn't uncommon on a current stock > jetted bike. This condition is only aggravated by removing the filter > door (Item 5) or using less restrictive air filters, including freshly > cleaned. > > I would suggest putting a .020" shim under the needle clip as a cheap > first step. R/C car shock washers are good for this . This would give > you the opportunity to examine the diaphragm while you are in there, > as a slightly torn or perforated one could be causing what you're > experiencing (not lifting needle out of main jet enough). Also, while > you have the slide in your hand is a good time to open up the small > equalization hole in it. I seem to recall I went up by 1/32" over the > existing hole size on my '06, which was only half the step up some > recommended. Doing this will help the throttle response, but has > nothing to do with the steady state air/fuel ratio. > > May be time to consider a DynoJet kit. > > Darn, I just reread your post and saw the full throttle part - I was > thinking (and mostly addressing) neutral to light throttle condition. > So I would definitely pull the carb and check the condition of the > diaphragm and check for restriction or roughness in the action of the > slide. Probably should double check your float level as well, and look > for restriction in the fuel delivery path. > > Happy diagnosing, > > Dennis > > > > On Sep 20, 2009, at 8:58 AM, spike55_bmw wrote: > > > I just returned from a 2,500 mile trip from PA (home base) to the > > Upper Peninsula of Michigan / Wisconsin. As the trip progressed my > > '06 KLR seemed like it developed a miss / on-off surging sensation > > (at steady throttle position) and got worse near the end of the > > trip. MPG were always 48+ to 53 - no deterioation as the trip > > progressed. > > > > I did look into some possible issues but no change so far. What I > > have noticed lately is that it seems like it is running out of gas > > at 5,500 rpms. I'll run 3rd gear up to that and maybe a little past, > > shift into 4th and the engine 'flutters' at 5,500 rpms at full > > throttle, it continues to flutter in 5th and the rpms will very > > slowly creep up still at full throttle. Not awe inspiring at this > > point - something is noticably wrong and slowly getting worse. > > > > 1.) I checked the valve clearances - all were well within spec > > 2.) I did take apart the carb but only to look at the major > > components (no jets removed) - nothing obviously broken / dirty / etc > > 3.) I did adjust the fuel / air mixture screw one-half turn more > > rich - no change - still backfiring on decel > > 4.) I cleaned an already clean air filter - no change > > 5.) I ran the bike with the cleaned air filter with the airbox hatch > > off - very load but no change > > 6.) I replaced the spark plug with standard and verified the gap - > > no change > > 7.) I made sure that the exhaust header bolts where tight - no change > > 8.) I checked the fuel tank breather tube system and it was free > > flowing > > 9.) While the engine was fluttering, I opened the gas cap - no change > > 10.) While the engine was fluttering, I opened and closed the choke > > - no change > > 11.) I ran the bike with the petcock set to reserve - no change > > > > I'm open for suggestions. I'm thinking: fuel or air, not timing > > because the engine will initially rev up and over 5,500 rpms but > > then seems to become 'starved' until you leave off the throttle and > > it can catch up. > > > > I still have the original vacuum line between the carb and petcock - > > maybe it is now leaking / collapsing under higher stress, thereby > > restricting fuel flow. I have not taken apart the petcock but maybe > > it isn't as free-flowing as it should be - not holding the vacuum to > > stay open or it has a partially clogged filter. > > > > I have not modified the carb other than making the fuel / air more > > rich but maybe more is needed. > > > > Don R100, A6F > > > [Non-text portions of this message have been removed] >

[rosslindberg]

Just out of curiousity, are you running a fuel filter and have you inspected the inside of the fuel line hoses. I kind of sounds like you have enough fuel to get up to speed, but as the engine load increases, demand is outstripping the fuel supply. Ross Lindberg Fertile, MN

--- In DSN_KLR650@yahoogroups.com, "spike55_bmw" wrote: > > Den: > I did have the carb apart to look for a torn diaphragm and it seemed OK. I used some 'grease in the groove' to seat the diaphragm (BMW Airhead trick on the Bing carbs). I had the bowl off to look at the floats' action and that seemed OK too. I shot carb cleaner up & down all of the pin holes in the carb body - all passed the fluid. Again, inside & out looked very clean. I routinely (about every 5 tank-fills) use some Seafoam, or Marvel Mystery Oil, or some gas-line antifreeze (not together) to keep the fuel system and top end in shape. It seems like that regiment has done a good job so far. > > I truely am satisfied with the stock carb that matches the stock exhaust. I just want to get back to normal. Maybe I'll call the Harley dealer tomorrow to see if they have any carb parts (supposedly less expensive that going through Kawi - hard to believe considering its HD). But I really don't want to Dyna-Jet or drill anything out. > > Again, I seem to have enough fuel delivered to get up to 5,500 rpms in 3rd gear but by then I get this flutter / flat / very slow response at that same rpm in 4th and 5th gears with the throttle on full. > > Don R100, A6F > > --- In DSN_KLR650@yahoogroups.com, Dennis Griffin wrote: > > > > Sounds like lean surge to me. The worsening you mentioned could be due > > to gradual carbon buildup in the combustion chamber. This can lead to > > slightly higher compression and possibly some preignition that may or > > may not be audibly detected. I have always liked using a proper dose > > of Berrymans B12 in the fuel on occasion to combat this. Makes a good > > fuel dryer and helps keep the entire fuel system clean. > > > > Item 3 - Should affect low speed only. No effect to the air/fuel ratio > > at cruising speeds, which is determined by the main jet/needle sizes & > > relationship. > > > > Item 10 - I think the choke only works by supplying additional fuel in > > the idle circuit, not by restricting air flow like the old chokes did, > > so it doesn't surprise me that you didn't see a difference at highway > > speed with it actuated. > > > > You say you can accelerate up to the speed where the "flutter" is > > occurring in a lower gear without experiencing it. This says you are > > getting enough fuel under acceleration or loaded throttle. Lean surge > > at neutral to slightly loaded throttle and a moderate cruise speed, > > especially with a good tailwind, isn't uncommon on a current stock > > jetted bike. This condition is only aggravated by removing the filter > > door (Item 5) or using less restrictive air filters, including freshly > > cleaned. > > > > I would suggest putting a .020" shim under the needle clip as a cheap > > first step. R/C car shock washers are good for this . This would give > > you the opportunity to examine the diaphragm while you are in there, > > as a slightly torn or perforated one could be causing what you're > > experiencing (not lifting needle out of main jet enough). Also, while > > you have the slide in your hand is a good time to open up the small > > equalization hole in it. I seem to recall I went up by 1/32" over the > > existing hole size on my '06, which was only half the step up some > > recommended. Doing this will help the throttle response, but has > > nothing to do with the steady state air/fuel ratio. > > > > May be time to consider a DynoJet kit. > > > > Darn, I just reread your post and saw the full throttle part - I was > > thinking (and mostly addressing) neutral to light throttle condition. > > So I would definitely pull the carb and check the condition of the > > diaphragm and check for restriction or roughness in the action of the > > slide. Probably should double check your float level as well, and look > > for restriction in the fuel delivery path. > > > > Happy diagnosing, > > > > Dennis > > > > > > > > On Sep 20, 2009, at 8:58 AM, spike55_bmw wrote: > > > > > I just returned from a 2,500 mile trip from PA (home base) to the > > > Upper Peninsula of Michigan / Wisconsin. As the trip progressed my > > > '06 KLR seemed like it developed a miss / on-off surging sensation > > > (at steady throttle position) and got worse near the end of the > > > trip. MPG were always 48+ to 53 - no deterioation as the trip > > > progressed. > > > > > > I did look into some possible issues but no change so far. What I > > > have noticed lately is that it seems like it is running out of gas > > > at 5,500 rpms. I'll run 3rd gear up to that and maybe a little past, > > > shift into 4th and the engine 'flutters' at 5,500 rpms at full > > > throttle, it continues to flutter in 5th and the rpms will very > > > slowly creep up still at full throttle. Not awe inspiring at this > > > point - something is noticably wrong and slowly getting worse. > > > > > > 1.) I checked the valve clearances - all were well within spec > > > 2.) I did take apart the carb but only to look at the major > > > components (no jets removed) - nothing obviously broken / dirty / etc > > > 3.) I did adjust the fuel / air mixture screw one-half turn more > > > rich - no change - still backfiring on decel > > > 4.) I cleaned an already clean air filter - no change > > > 5.) I ran the bike with the cleaned air filter with the airbox hatch > > > off - very load but no change > > > 6.) I replaced the spark plug with standard and verified the gap - > > > no change > > > 7.) I made sure that the exhaust header bolts where tight - no change > > > 8.) I checked the fuel tank breather tube system and it was free > > > flowing > > > 9.) While the engine was fluttering, I opened the gas cap - no change > > > 10.) While the engine was fluttering, I opened and closed the choke > > > - no change > > > 11.) I ran the bike with the petcock set to reserve - no change > > > > > > I'm open for suggestions. I'm thinking: fuel or air, not timing > > > because the engine will initially rev up and over 5,500 rpms but > > > then seems to become 'starved' until you leave off the throttle and > > > it can catch up. > > > > > > I still have the original vacuum line between the carb and petcock - > > > maybe it is now leaking / collapsing under higher stress, thereby > > > restricting fuel flow. I have not taken apart the petcock but maybe > > > it isn't as free-flowing as it should be - not holding the vacuum to > > > stay open or it has a partially clogged filter. > > > > > > I have not modified the carb other than making the fuel / air more > > > rich but maybe more is needed. > > > > > > Don R100, A6F > > > > > > [Non-text portions of this message have been removed] > > >

[spike55_bmw]

No additional fuel filters have been used. I haven't specifically inspected the fuel line (petcock to carb). Don R100, A6F

--- In DSN_KLR650@yahoogroups.com, "rosslindberg" wrote: > > Just out of curiousity, are you running a fuel filter and have you inspected the inside of the fuel line hoses. I kind of sounds like you have enough fuel to get up to speed, but as the engine load increases, demand is outstripping the fuel supply. > > Ross Lindberg > Fertile, MN > > --- In DSN_KLR650@yahoogroups.com, "spike55_bmw" wrote: > > > > Den: > > I did have the carb apart to look for a torn diaphragm and it seemed OK. I used some 'grease in the groove' to seat the diaphragm (BMW Airhead trick on the Bing carbs). I had the bowl off to look at the floats' action and that seemed OK too. I shot carb cleaner up & down all of the pin holes in the carb body - all passed the fluid. Again, inside & out looked very clean. I routinely (about every 5 tank-fills) use some Seafoam, or Marvel Mystery Oil, or some gas-line antifreeze (not together) to keep the fuel system and top end in shape. It seems like that regiment has done a good job so far. > > > > I truely am satisfied with the stock carb that matches the stock exhaust. I just want to get back to normal. Maybe I'll call the Harley dealer tomorrow to see if they have any carb parts (supposedly less expensive that going through Kawi - hard to believe considering its HD). But I really don't want to Dyna-Jet or drill anything out. > > > > Again, I seem to have enough fuel delivered to get up to 5,500 rpms in 3rd gear but by then I get this flutter / flat / very slow response at that same rpm in 4th and 5th gears with the throttle on full. > > > > Don R100, A6F > > > > --- In DSN_KLR650@yahoogroups.com, Dennis Griffin wrote: > > > > > > Sounds like lean surge to me. The worsening you mentioned could be due > > > to gradual carbon buildup in the combustion chamber. This can lead to > > > slightly higher compression and possibly some preignition that may or > > > may not be audibly detected. I have always liked using a proper dose > > > of Berrymans B12 in the fuel on occasion to combat this. Makes a good > > > fuel dryer and helps keep the entire fuel system clean. > > > > > > Item 3 - Should affect low speed only. No effect to the air/fuel ratio > > > at cruising speeds, which is determined by the main jet/needle sizes & > > > relationship. > > > > > > Item 10 - I think the choke only works by supplying additional fuel in > > > the idle circuit, not by restricting air flow like the old chokes did, > > > so it doesn't surprise me that you didn't see a difference at highway > > > speed with it actuated. > > > > > > You say you can accelerate up to the speed where the "flutter" is > > > occurring in a lower gear without experiencing it. This says you are > > > getting enough fuel under acceleration or loaded throttle. Lean surge > > > at neutral to slightly loaded throttle and a moderate cruise speed, > > > especially with a good tailwind, isn't uncommon on a current stock > > > jetted bike. This condition is only aggravated by removing the filter > > > door (Item 5) or using less restrictive air filters, including freshly > > > cleaned. > > > > > > I would suggest putting a .020" shim under the needle clip as a cheap > > > first step. R/C car shock washers are good for this . This would give > > > you the opportunity to examine the diaphragm while you are in there, > > > as a slightly torn or perforated one could be causing what you're > > > experiencing (not lifting needle out of main jet enough). Also, while > > > you have the slide in your hand is a good time to open up the small > > > equalization hole in it. I seem to recall I went up by 1/32" over the > > > existing hole size on my '06, which was only half the step up some > > > recommended. Doing this will help the throttle response, but has > > > nothing to do with the steady state air/fuel ratio. > > > > > > May be time to consider a DynoJet kit. > > > > > > Darn, I just reread your post and saw the full throttle part - I was > > > thinking (and mostly addressing) neutral to light throttle condition. > > > So I would definitely pull the carb and check the condition of the > > > diaphragm and check for restriction or roughness in the action of the > > > slide. Probably should double check your float level as well, and look > > > for restriction in the fuel delivery path. > > > > > > Happy diagnosing, > > > > > > Dennis > > > > > > > > > > > > On Sep 20, 2009, at 8:58 AM, spike55_bmw wrote: > > > > > > > I just returned from a 2,500 mile trip from PA (home base) to the > > > > Upper Peninsula of Michigan / Wisconsin. As the trip progressed my > > > > '06 KLR seemed like it developed a miss / on-off surging sensation > > > > (at steady throttle position) and got worse near the end of the > > > > trip. MPG were always 48+ to 53 - no deterioation as the trip > > > > progressed. > > > > > > > > I did look into some possible issues but no change so far. What I > > > > have noticed lately is that it seems like it is running out of gas > > > > at 5,500 rpms. I'll run 3rd gear up to that and maybe a little past, > > > > shift into 4th and the engine 'flutters' at 5,500 rpms at full > > > > throttle, it continues to flutter in 5th and the rpms will very > > > > slowly creep up still at full throttle. Not awe inspiring at this > > > > point - something is noticably wrong and slowly getting worse. > > > > > > > > 1.) I checked the valve clearances - all were well within spec > > > > 2.) I did take apart the carb but only to look at the major > > > > components (no jets removed) - nothing obviously broken / dirty / etc > > > > 3.) I did adjust the fuel / air mixture screw one-half turn more > > > > rich - no change - still backfiring on decel > > > > 4.) I cleaned an already clean air filter - no change > > > > 5.) I ran the bike with the cleaned air filter with the airbox hatch > > > > off - very load but no change > > > > 6.) I replaced the spark plug with standard and verified the gap - > > > > no change > > > > 7.) I made sure that the exhaust header bolts where tight - no change > > > > 8.) I checked the fuel tank breather tube system and it was free > > > > flowing > > > > 9.) While the engine was fluttering, I opened the gas cap - no change > > > > 10.) While the engine was fluttering, I opened and closed the choke > > > > - no change > > > > 11.) I ran the bike with the petcock set to reserve - no change > > > > > > > > I'm open for suggestions. I'm thinking: fuel or air, not timing > > > > because the engine will initially rev up and over 5,500 rpms but > > > > then seems to become 'starved' until you leave off the throttle and > > > > it can catch up. > > > > > > > > I still have the original vacuum line between the carb and petcock - > > > > maybe it is now leaking / collapsing under higher stress, thereby > > > > restricting fuel flow. I have not taken apart the petcock but maybe > > > > it isn't as free-flowing as it should be - not holding the vacuum to > > > > stay open or it has a partially clogged filter. > > > > > > > > I have not modified the carb other than making the fuel / air more > > > > rich but maybe more is needed. > > > > > > > > Don R100, A6F > > > > > > > > > [Non-text portions of this message have been removed] > > > > > >

[SM]

It sure sounds like valves, but you say you have checked them....I bet it's something simple, probably the vacuum side of the petcock. I had a similar situation... After I took the carb apart 3 times, I found out it was just some bad gas. Fresh gas and the bike ran fine. Try hooking up a temporary tank and throwing some fresh gas through there... Couldn't hurt... Thanks CA Stu --- In DSN_KLR650@yahoogroups.com, Dennis Griffin

> > > On Sep 20, 2009, at 8:58 AM, spike55_bmw wrote: > > > I just returned from a 2,500 mile trip from PA (home base) to the > > Upper Peninsula of Michigan / Wisconsin. As the trip progressed my > > '06 KLR seemed like it developed a miss / on-off surging sensation > > (at steady throttle position) and got worse near the end of the > > trip. MPG were always 48+ to 53 - no deterioation as the trip > > progressed. > >

[spike55_bmw]

I'd believe the bad gas scenario but this has slowly gotten worse over the last 1,000 miles (new gas every 150 - 200 miles over a 3 day period). Valves adjusted before trip and checked after return - all good. I have come to the conclusion that the petcock is my next stop. Had every intention to do it today but family stuff changed my plans. I'm half thinking that a slight vacuum leak could limit fuel flow to something less than 100%. I did verify that my local Harley dealer does in fact have CVK40 parts for less than my local Kawi dealer. For example, the diaphragm / slide assembly from HD is $46, from Kawi $132. Don R100, A6F

--- In DSN_KLR650@yahoogroups.com, "SM" wrote: > > It sure sounds like valves, but you say you have checked them....I bet it's something simple, probably the vacuum side of the petcock. > > I had a similar situation... > After I took the carb apart 3 times, I found out it was just some bad gas. > Fresh gas and the bike ran fine. > > Try hooking up a temporary tank and throwing some fresh gas through there... Couldn't hurt... > > Thanks > CA Stu > > > > > --- In DSN_KLR650@yahoogroups.com, Dennis Griffin > > > > > > On Sep 20, 2009, at 8:58 AM, spike55_bmw wrote: > > > > > I just returned from a 2,500 mile trip from PA (home base) to the > > > Upper Peninsula of Michigan / Wisconsin. As the trip progressed my > > > '06 KLR seemed like it developed a miss / on-off surging sensation > > > (at steady throttle position) and got worse near the end of the > > > trip. MPG were always 48+ to 53 - no deterioation as the trip > > > progressed. > > > >

[Jeff Saline]

On Sun, 20 Sep 2009 22:28:37 -0000 "spike55_bmw" writes: SNIP

> Again, I seem to have enough fuel delivered to get up to 5,500 rpms > in 3rd gear but by then I get this flutter / flat / very slow > response at that same rpm in 4th and 5th gears with the throttle on > full. > > Don R100, A6F

<><><><><><><><> <><><><><><><><> Don, Are you absolutely sure it's not the chain? Folks often experience a surging/shutter when the chain is on it's way out. Best, Jeff Saline ABC # 4412 South Dakota Airmarshal Airheads Beemer Club www.airheads.org The Beautiful Black Hills of South Dakota 75 R90/6, 03 KLR650, 79 R100RT . ____________________________________________________________ Best Weight Loss Program - Click Here! http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTFoYe00hbMgeNIu5uiVyjH0zw9jbr11YwgdOS3LqpJL8Lo1eLmM5C/

[spike55_bmw]

I have in hand a new EK 520 X-ring, new OEM 15T, and a new JT 44T. I'll get those on tonight. Will go out for a test run between the rain drops. Petcock parts are ordered, so I have new to install if chain / sprockets aren't the issue. The original OEM 15T has 20K+ on it and is thin but the teeth aren't bent over. Again, the engine problem seems more related to rpm not mph. Further testing is scheduled. Don R100, A6F

--- In DSN_KLR650@yahoogroups.com, Jeff Saline wrote: > > On Sun, 20 Sep 2009 22:28:37 -0000 "spike55_bmw" > writes: > > SNIP > > > Again, I seem to have enough fuel delivered to get up to 5,500 rpms > > in 3rd gear but by then I get this flutter / flat / very slow > > response at that same rpm in 4th and 5th gears with the throttle on > > full. > > > > Don R100, A6F > <><><><><><><><> > <><><><><><><><> > > Don, > > Are you absolutely sure it's not the chain? > > Folks often experience a surging/shutter when the chain is on it's way > out. > > Best, > > Jeff Saline > ABC # 4412 South Dakota Airmarshal > Airheads Beemer Club www.airheads.org > The Beautiful Black Hills of South Dakota > 75 R90/6, 03 KLR650, 79 R100RT > > . > ____________________________________________________________ > Best Weight Loss Program - Click Here! > http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTFoYe00hbMgeNIu5uiVyjH0zw9jbr11YwgdOS3LqpJL8Lo1eLmM5C/ >

[spike55_bmw]

I just posted some pics in "20,411 Miles - Chain & Sprockets". I took it out for a 'slow' test ride after completing. It still seems like it is 'hunting'. Maybe tomorrow I take it out for a high speed test run. As you can see from the pics, there was some wear on all parts but nothing was near to a catastophic failure. Might have gotten a little wild with the RTV on the Master Link. I guess I'll move on to the petcock tomorrow night. Don R100, A6F

--- In DSN_KLR650@yahoogroups.com, Jeff Saline wrote: > > On Sun, 20 Sep 2009 22:28:37 -0000 "spike55_bmw" > writes: > > SNIP > > > Again, I seem to have enough fuel delivered to get up to 5,500 rpms > > in 3rd gear but by then I get this flutter / flat / very slow > > response at that same rpm in 4th and 5th gears with the throttle on > > full. > > > > Don R100, A6F > <><><><><><><><> > <><><><><><><><> > > Don, > > Are you absolutely sure it's not the chain? > > Folks often experience a surging/shutter when the chain is on it's way > out. > > Best, > > Jeff Saline > ABC # 4412 South Dakota Airmarshal > Airheads Beemer Club www.airheads.org > The Beautiful Black Hills of South Dakota > 75 R90/6, 03 KLR650, 79 R100RT > > . > ____________________________________________________________ > Best Weight Loss Program - Click Here! > http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTFoYe00hbMgeNIu5uiVyjH0zw9jbr11YwgdOS3LqpJL8Lo1eLmM5C/ >