Sprocket set-up - Kawasaki KLR 650 Forum
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post #1 of 5 Old 08-08-2013, 12:38 PM Thread Starter
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Sprocket set-up

I'm not the techtype smartest guy in the world(but I did buy a KLR)..
My 2008 has 17 teeth in the front and 42 in the rear. I'm 6'4 and weight 320 lbs. I don't know if I am missing anything performance wise. The guy who set it up is pretty savvy but He is gone now, he was tall but not heavy. I'm not sure if weight has anything to do with anything but at over 300lbs I assume it may. It seems to run fine, old adage, if it's not broke don't fix it may apply.
I'm getting 54 miles a gallon. I don't seem to have a lot of power on freeway but that could be the weight thing. Any help would really be appreciated. Thank you
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post #2 of 5 Old 08-08-2013, 12:54 PM
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17/42 raises the final gear ratio to 14% over stock. That's a good thing, as it reduces your rpm by 14%. Good for oil consumption and good for fuel economy.

It's a bad thing in that it reduces the bike's ability to accelerate quickly. The KLR first gear is already tall, so increasing the final drive ratio by 14% is going to make the bike feel gutless and slow. Even more gutless and slow than it already was. It also makes slow going in the off-road very difficult without a lot of clutch slipping.

If you're happy with it, leave it.

If you want to have some performance back, then switch over to the stock ratio of 15/43. That will make accelerating easier. You gas mileage may suffer a bit. Most people find the KLR delivers about 45mpg. That's what you may see.

T

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Last edited by Tom Schmitz; 08-08-2013 at 01:47 PM. Reason: Where'd the '17' go? Meh.
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post #3 of 5 Old 08-08-2013, 01:45 PM
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Quote:
Originally Posted by rlamp4040 View Post
I'm not the techtype smartest guy in the world(but I did buy a KLR).
Suggested alternate parenthetical phrase:

(but I did sleep in a Holiday Inn Express last night)



Your drivetrain, whose final effective gear ratio is determined by relative numbers of sprocket teeth, MULTIPLIES engine torque.

The larger the countershaft sprocket, and the smaller the rear sprocket, the lower the torque multiplication factor.

Regardless, you must decide what satisfies you most. Closer to the stock ratio (15/43), more acceleration and hill-climbing ability is found. Toward your "high" (17/42) gearing, lower rpm per mph.

Name your poison!
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post #4 of 5 Old 08-08-2013, 02:08 PM
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Quote:
Originally Posted by rlamp4040 View Post
I'm not the techtype smartest guy in the world(but I did buy a KLR)..
My 2008 has 17 teeth in the front and 42 in the rear. I'm 6'4 and weight 320 lbs. I don't know if I am missing anything performance wise. The guy who set it up is pretty savvy but He is gone now, he was tall but not heavy. I'm not sure if weight has anything to do with anything but at over 300lbs I assume it may. It seems to run fine, old adage, if it's not broke don't fix it may apply.
I'm getting 54 miles a gallon. I don't seem to have a lot of power on freeway but that could be the weight thing. Any help would really be appreciated. Thank you

Front sprockets are cheap. 1 tooth in the front is about 3 in the rear. 15 is stock I like a 16 with the OEM rear size.

The power on the freeway is more of a horsepower issue than gearing IMHO. By the time you are up to 65+ mph there's not much left regardless of how the bike is geared. My old mini-van would pull my KLR at passing speeds I bet.

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #5 of 5 Old 08-08-2013, 04:40 PM Thread Starter
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thank you all very much
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