Clutch
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@Ricky How bad is the vibration??
As said the clutch is weighted and needs to be balanced properly.
If the clutch is REALLY bad, then sounds like it hasn't been timed correctly with the balancer shaft.
Has the engine been rebuilt?
Remember, it is a two stroke, expect vibrations. Again it comes down to how bad.
Could be lose engine mounts...
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@Ricky Well if it's original internals then it could be knocking, which will mean it'll need a rebuild.
if it's been rebuilt then it could be that it hasn't been assembled properly, and the engine hasn't been timed up properly. But the vibration when the engine isn't timed up is really bad!
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Go back in and check the torque on the nuts, is it noisy? like a continuous ticking sound? Clutch plates are slipping if the revs are dying, Re-adjust the clutch action on the clutch itself.
Mine did this once, but vibration suggests bearing, or loose plates, which seems unlikely.
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A video as promised please ignore the tapping lol
https://youtu.be/BdgV44NU6D8 -
So what's the tapping?
The fact the idle goes down with the clutch in doesn't really bother me. I see that a lot, usually the thrust bearings going on the clutch, however we don't have those.
What we do have is a primary drive bearing, which if it's on its way out, will vibrate and probably cause this sort of issue.
With that sort of mileage on a two stroke, and an uncertainty of the engines age, I'd be stripping it down for a rebuild...
I don't think we're going to diagnose it really.
If it isn't what I've been suggesting then I really think it might just be an engine rebuild jobby, or paranoia.
If it was really bad then you would know. Again it all comes back to how much vibration. If it's a lot, then it's for a reason. But two strokes rattle a lot anyway so it's really hard to tell.