How to shim the cush drive: Difference between revisions

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The rear sprocket carrier is not rigidly coupled to the rear wheel; it "floats", with a piece of hard rubber taking up the slack. If there is too much slack, you'll feel excessive drive lash when applying and releasing throttle. Adding shims takes up some free play and reduces the lash.

A new cush drive is $42 plus S&H at Ron Ayers, but ~~reports state that~~ even a new one can have more play than desired.

A new cush drive is $42 plus S&H at Ron Ayers, but even a new one can have more play than desired.

With the rear wheel [[Removing/replacing the rear wheel|off the bike]] and properly supported (put it up on some 2x4s or an old 13" auto tire to avoid damaging the brake rotor on the other side) wiggle the sprocket carrier off. If you've never taken it off, gunk may be holding it on. Just twist and wiggle, and it'll come off.

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[[Image:Cush drive 3.jpg|150px]]

Put the sprocket carrier back in place (it may be a little tight now; simply press and wiggle) and reinstall the wheel. You should notice a much smoother ride. Members report that the difference is noticeable. Acceleration and deceleration are a lot smoother and not as "jerky." It's a good modification to do, and ~~it's~~ very easy to perform.

Put the sprocket carrier back in place (it may be a little tight now; simply press and wiggle) and reinstall the wheel. You should notice a much smoother ride. Members report that the difference is noticeable. Acceleration and deceleration are a lot smoother and not as "jerky." It's a good modification to do and very easy to perform.

@@ Line 2: / Line 2: @@
 The rear sprocket carrier is not rigidly coupled to the rear wheel; it "floats", with a piece of hard rubber taking up the slack. If there is too much slack, you'll feel excessive drive lash when applying and releasing throttle. Adding shims takes up some free play and reduces the lash.
-A new cush drive is $42 plus S&H at Ron Ayers, but reports state that even a new one can have more play than desired.
+A new cush drive is $42 plus S&H at Ron Ayers, but even a new one can have more play than desired.
 With the rear wheel [[Removing/replacing the rear wheel|off the bike]] and properly supported (put it up on some 2x4s or an old 13" auto tire to avoid damaging  the brake rotor on the other side) wiggle the sprocket carrier off. If you've never taken it off, gunk may be holding it on. Just twist and wiggle, and it'll come off.
@@ Line 18: / Line 18: @@
 [[Image:Cush drive 3.jpg|150px]]
-Put the sprocket carrier back in place (it may be a little tight now; simply press and wiggle) and reinstall the wheel. You should notice a much smoother ride. Members report that the difference is noticeable. Acceleration and deceleration are a lot smoother and not as "jerky." It's a good modification to do, and it's very easy to perform.
+Put the sprocket carrier back in place (it may be a little tight now; simply press and wiggle) and reinstall the wheel. You should notice a much smoother ride. Members report that the difference is noticeable. Acceleration and deceleration are a lot smoother and not as "jerky." It's a good modification to do and very easy to perform.