Sunl90 insane vibration

Flipem · 10-03-2021, 05:41 PM

Hi guys. I have been wrenching on 50cc "Coolster" style atvs for the last couple months. I recently picked up a Sunl90 and got it running. It runs fine and has great power but the vibration at mid to high rpm is insane. This setup only uses the rear and top motor mounts, they were loose at first and I tightened them up as the motor moved sideways a lot under load. The whole quad shakes and you can hear it growling when this happens. I have read that motor mounts could be an issue but is that the case when they are tightened right up? Are these more prone to vibration than the 50ccs that use the lower mounting plate? I have lots of spare engines to swap in and try as well.

10-03-2021, 05:41 PM	#1
Flipem Join Date: Oct 2021 Location: Alberta Posts: 2	Sunl90 insane vibration Hi guys. I have been wrenching on 50cc "Coolster" style atvs for the last couple months. I recently picked up a Sunl90 and got it running. It runs fine and has great power but the vibration at mid to high rpm is insane. This setup only uses the rear and top motor mounts, they were loose at first and I tightened them up as the motor moved sideways a lot under load. The whole quad shakes and you can hear it growling when this happens. I have read that motor mounts could be an issue but is that the case when they are tightened right up? Are these more prone to vibration than the 50ccs that use the lower mounting plate? I have lots of spare engines to swap in and try as well.
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