Motor sounds like a chain saw

[beachbum]

I bought a new 150cc motor. I had to change the axle out and put my old one in along with changing the Stator. I installed it and it started and runs well. But, it sounds like a chain saw. I cannot figure out where the noise is coming from.

Starter clutch? Cam chain, variator or clutch?

It runs great; good accerlation, smooth throughout...but the noise is just bugging me.