--- In DSN_KLR650@yahoogroups.com, Rick Brown wrote: > > Hi Mark and All, > > I hadn't considered re-jeting for my bike. I was just having a couple of problems I figured I could get some advice on to make it easier to start and maybe get a little better power at higher altitude. > > It looks to me that I might want to open up the air cleaner box so the bike breaths better and maybe adjust the carburator to run a little leaner on idle. > > I might even experiment w/ a hotter plug (mindfull of the heat). > > However I'm like most of the other guys on this site, I'd rather be riding on the bike rather than working on it. > > I do thank everybody for their input on this matter, it has been a help both for the simple fixes to try on the performance end and the fishing rod holder. > > I hope to report on the results on the performance tweaks and maybe some pictures of the rack in the next couple of weeks. > > Sounds like great riding you're getting in! > Rick > > > > > ________________________________ > From: Mark Harfenist > To: DSN_KLR650@yahoogroups.com > Sent: Wed, April 28, 2010 5:40:34 AM > Subject: [DSN_KLR650] high altitude > > > This is the part I can't seem to grasp about jetting for altitude. A couple of months ago I rode through various iterations of the Andes (Colombia, Peru, Bolivia, then back and forth between Argentina and Chile). Altitude on any given day could range from 15k feet down to 5k.....or even to sea level, before climbing back to 15k. This went on for a couple of months. At high altitudes the bike ran crummy, but it hardly even fouled my spark plug and all returned to KLR-normal whenever I descended. > > > If I'd changed out jets, I'd be spending all my time by the side of the road fiddling with my carburator.. ..or I'd be shipping my bike home in a crate for engine repairs. Perhaps it's different if you ride only in Colorado and Wyoming, but what do you do if you decide to visit your cousin in Phoenix or your great Aunt in Iowa City? Are people really this methodical? Or is the changing of jets appropriate to a certain kind of usage, perhaps less applicable to long-distance travel through major mountain ranges? > > Not a criticism, but rather genuine curiosity. > > Mark > > (from Brasilia, a surreal, master-planned city built in just three years from scratch back in the fabulous sixties, now fraying a bit around the edges) > > > > >high altitude > >Posted by: "beachmike1" beachmike1@yahoo. com beachmike1 > >Tue Apr 27, 2010 9:56 pm (PDT) > >"DO NOT OVER LEAN JETTING. By that. do not rejet to a elevation higher than you plan to ride. IE if >you jet to 6000 ft and ride at say 4000, expect a LARGE repair bill. " >
high altitude
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high altitude
First of all, your bike is not going to run really badly at higher elevations. The vacuum slide carb compensates to some extent for the thinner air, so the only place where your mixture might be way off is at idle. If you have not done anything with the pilot mixture screw, even that is likely to be pretty close, as it come lean from the factory. Turning that screw in will lean out your idle mixture, and may make your bike easier to start.
Some loss of power is inevitable at high elevations, no matter what you do with your jetting. If your bike seems too rich even after leaning out the idle mixture, you could try removing your airbox door, but don't ride through any tarns.
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