Don’t know if anyone else has had this happen but a few weeks ago lost power with my HuaSheng 4 stoke and started knocking. After a tear down found they use no locking device on the connecting rod bolts. So broke down all my motors and wired the bolt heads together. That’s the last time that will happen. See picture, sorry for the bad shot didn’t no till the motors were back together but some will know what I did and others should get the idea. Just keep mind that pulling direction of the wire should always be in the bolt tightening direction.
Yodabob legal in PA
YouTube - Motorized bike street legal in PA 2
Yodabob legal in PA
YouTube - Motorized bike street legal in PA 2