thanks to all your replies.
timo i´m not sure if carb balance affects at so high revolutions, but will check it anyway.
fritz with respect to the shaft, could be the cause but it´s not a rythmic vibration, it´s a constant vibration, same as a buzzer.
my problem is that when i´d rebuilt my tranny my clutch plate hadn´t any mark, then i did my own marks for mounting it same way that it was.
anybody know how can i find the heavier point on the clutch plate?
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