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He is talking about his V65.This clutch and gearbox is very different from the Tonti models.But - remove the gearbox and check out the clutch first.The gearbox can not be checked on the bench - you can only check it by revolving the inlet and the outlet axels with different speed - at the same time while changing gears.
Tweaked shifting fork? If the other gears are shifting Ok might not be the clutch. Just a thought.kk