sprockets - was drilling the carb slide
Posted: Sun Feb 24, 2008 11:45 pm
Hey all;
A guy once told me that if I wanted to gear my bike down a little for going into the really snarly stuff, it was better to buy a back sprocket with two or three teeth more, rather than go down one tooth on the counter sprocket. His reasoning made sense to me: If you go a smaller counter sprocket, you are bending the chain into a tighter loop there and putting the same power into one fewer links. Obviously, this would increase the strain and wear. With a larger rear sprocket that is not so.
Of course, if you want to ride the freeway to a location, then do a quck change along the road, it would be more practical to change the countershaft sprocket. *Duhh!* However, if you do most of your riding at slower speeds, and you stay at the lower sprocket gearing, his point makes good sense to me.
For me, moving in the opposite direction is indicated because I do almost all my riding at highway speeds, or at least very fast dirt roads. (usually 40+ MPH.) Therefor, a higher gearing makes sense. When my original chain and sprockets are shot I could try to find a 44 tooth rear sprocket which is almost a perfect match for going up one tooth on the counter sprocket. I would expect that I would need a chain which is a link or two shorter, but maybe not. Why not go up one on the counter sprocket to get more links into the action instead? I may, but first I need to look at clearance issues. This is my first KLR and I'm not sure how much room there is down there and some bikes I've had over the years was a little too close for that. If there is plenty of room, I may very well do it that way. I suspect it will be fine since many of you have been doing it that way for a long time.
Lash
----- Original Message ----
From: GMac999
To: Luc Legrain
Cc: DSN_klr650@yahoogroups.com
Sent: Sunday, February 24, 2008 8:13:46 PM
Subject: RE: [DSN_KLR650] KLR650 : Drilling the carb slide
Luc,
I think it's the opposite. The smaller in front and larger in rear,
the
faster the engine turns for the same speed. The 14/47 is great for
off-road. The 16/47 extremely close to the factory 15/43. I use the
15/47
as a compromise between added torque/power at lower speeds and the
capability to maintain 65 down the interstate. I don't usually try
to run
75-85 down the interstate, but if I need to, I go to the 16/47
combination.
On my '95 it's 5 screws to change the countershaft sprocket, 3 for
the cover
and 2 for the sprocket, then adjust the chain if I'm going from the
16 to
the 14. If going from the 14 to the 16, then I have to loosen it
before I
start.
GregM
-----Original Message-----
From: Luc Legrain [mailto:zrislois2klr@ yahoo.com]
Sent: Sunday, February 24, 2008 5:38 PM
To: GMac999; 'Jeff Saline'
Cc: DSN_klr650@yahoogro ups.com
Subject: RE: [DSN_KLR650] KLR650 : Drilling the carb slide
Thanks y'all for the fantastic, hands on, " been there,done that
"feed
back on the carb. Now, for some reasons the conversation switched to
sprockets..
That's good.. 'cause I'm kind of lost when it comes to teeth. On my
childhood bicycle, the smaller the sprocket in front and the bigger
in the
rear the faster you would go depending on how strong your muscles
were. On a
35-40 HP ( ?) engine what would be
the "Ideal " combination?
--- GMac999 wrote:
road> Jeff, > > I have the 14/47 combo also. You're right, it's great in the tight > stuff. > I'd even considered the 13/47, but couldn't locate one for the two > bolt earlier models. I use it when it's a weekend of mostly off
run> riding. > When I have to run short commutes, less than 150 miles, I'll just
16/47.> the > 15/47 as an all around. Longer runs, 4 -500 miles, I go to the
> > GregM > > > > -----Original Message----- > From: Jeff Saline [mailto:salinej1@juno. com] > Sent: Sunday, February 24, 2008 4:38 PM > To: gmac999@yahoo. com > Cc: DSN_klr650@yahoogro ups.com > Subject: Re: [DSN_KLR650] KLR650 : Drilling the carb slide > > On Sun, 24 Feb 2008 08:53:48 -0800 (PST) GMac999
mid-point> writes: > > Jeff, > > > > I drilled the slide out to 1/8" on my '95. What > it took care of > for > > me was a slight lag at lower rpms when you twisted > the throttle. I > > > can't tell any difference with the middle and > upper rpms. > > > > SNIP > > > > GregM > <><><><><><> <><><><>< > > <><><><><><> <><><><>< > > > Greg, > > Thanks for another very good explanation. First it was a tire > evaluation and now it's performance based on an internal carb > modification. > You're on > a roll. : ) > > It sure looks like you scored well with drilling the slide. > > I'm running a 14/46 combo in the dirt. Your 15/47 is about
____________ _________ _________ _________ _________ _________ _ ________> between my 14/46 and 15/46 combos. Looks like it would be pretty > comparable to a 14/44 combo. I know it's a significant improvement > compared to the stock 15/43 combo. I bet you'd really like a 14/47 > combo in the dirt. It might be a bit slow in twisties. > > I sure appreciate your detailed and complete comments. > > 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 > > > > > > >
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