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Clutch chatter

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After my yz426 warms up or u ride it hard or for a good amount of time when u let the clucth out to take of its like it grabs n releases again off and on until the clutch is fully let out...what would cause this?

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Worn plates? Grooved clutch basket?

Or your oil causing it to slip

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Probably an improperly assembled clutch.  The OEM plate set includes one friction plate with a larger ID in order to accommodate a small Belleville spring and a thrust ring.  These serve to make the clutch engage more smoothly.  Items 12, 13, and 14 here: https://www.thumpertalk.com/shop/oem/images/Yamaha/2002/Motorcycles/51640_clutch.gif

 

The driven gear/basket assembly has a torsional damper built into the hub of the gear.  If there is any rotational free travel between the gear and the basket, that damper is bad, and could be contributing.

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I had the same problem on my 99. My problem was the basket taking a beating and the groves were .03-.080 deep lol

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