Originally Posted by Egor
This is the motor mount I made for the Kings/Schwinn. I sill don't like the way the one on the Raw bike vibrates. It might be the engine, I think the latest batch are the worst for vibration. Are the needle bearing in the wrist pin helping? I hear a lot of noise in the top end!
I would take the time to slip the head and jug off, and have a look! As you know if something lets go while it's running...The engine will more than likely be ruined.
Does it subside somewhat when the engine is hot? You may be hearing piston slap.