I have a 21 SP that is basically stock. With the chain tension adjusted properly, and the transmission in gear, it seems that the bike can rock excessively forward and backwards (compared to some other bikes).

Is there a specification for how many degrees the output shaft should normally be able to rotate when in gear? Mine seems to have the same amount of (excessive?)play, irrespective of which gear is engaged.

I don't think there is a spec.

It could be worked out I'm sure but the end result would depend on final gearing of the bike so might be a little pointless.

Mine do tend to rock forward and back a fair amount when in gear. I've never worried about it to be honest.
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If I have to take the carbs off once more...

perhaps the front sproket is worn, i replaced the front one on mine recently, gear teeth were fine but the the internal ones were well wornand there was loads of play, new sproket on and all is perfect

o o


Last edited by DifferentStrokes on Mon Sep 28, 2009 6:25 pm; edited 1 time in total

There is normaly very little backlash (slop to you) in the NSR's to the point where often they are hard to get on.

I've never seen a clutch gear or primary gear worn on one but there is always I first I guess.
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If I have to take the carbs off once more...

o o


Last edited by DifferentStrokes on Mon Sep 28, 2009 6:24 pm; edited 1 time in total

Has Yamaha ever made a decent clutch?! I've even heard the R1 boys bitching about clutches before!
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Andy.
NSR-WORLD.COM

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Thanks for your input. I'll be looking more carefully at the splines on the front sprocket/output shaft and the clutch assembly where it mates to the main shaft. Will follow up later if I find anything.