Engine vibrates above 33kmh

That makes sense. Glad you figured it out
Yeah once i had an air leak that was so bad that when i would pull the throttle and release the clutch the front tire would come off the ground its not quite that bad but i know where it is i am pretty sure where the intake manifold screws to the engine head well one of the ports for the screws is stripped on the engine head so im pretty sure that is where the air leak is because the hex head screw will not tighten at all
 
Can’t tell from the pic…
On my rear coaster hub I ran my bearings tight. It never did give me problems after this tightening.
At first I had issues with it running it where it felt normal. Whacked out a couple sets of bearings.
Someone here told me to run it tight and it did help.
Did not have to replace any from that point on.
 
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