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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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Old 03-23-2012, 11:01 PM
3hunerd 3hunerd is offline
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Default Countershaft sprocket shim

Hey all,

So, what type of shim should I use for the countershaft to minimize movement of the front sprocket? Where can I get one once I get the measurements? Will the thin metal washers that are used on the rear linkage work?? They seem prone to corrosion though.

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Old 03-23-2012, 11:04 PM
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stainlesscycle stainlesscycle is offline
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are you trying to shim it outboard to the sprocket - to load against the circlip??
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Old 03-23-2012, 11:51 PM
3hunerd 3hunerd is offline
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Presuming the inside to keep the seal tight - which side is typically shimmed to accomplish that?
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Old 03-24-2012, 07:06 AM
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the seal is press fit, and shouldn't go anywhere. is everything right in there? seal, bushing and 2 o-rings. is your seal pushing out? it's all splash lubrication in there, i would think the only way the seal would push out is if there is extra pressure in there (leaking centercase gasket, or maybe waterpump seal?)
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Old 03-24-2012, 10:05 AM
3hunerd 3hunerd is offline
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Hmmm - well, not sure it is pressing out necessarily. I just saw that GMP recommended this if you're changing things out. I also heard that people tend to shim it if they are using the iron man sprockets, as they are slightly thinner - at least on the KTMs this is the case. The difference in thickness of the iron man to a Renthal looked negligible. I didn't put a caliper on them, but put them on a level surface, and put a level across them. Interesting points - what about overfill in the crankcase??
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Old 03-24-2012, 10:29 AM
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i don't shim the ironman sprocket - haven't had an issue, although gmp has a point..

overfill crankcase would probably cause pressure too, but you'd have to really really overfill it....
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