Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Was blow to the crankshaft end with the pulleys? You can have a bent crankshaft! Has to be perfectly round, with clutch removed, use a dial indicator to check crankshaft or without one, use a pointer clamped the the frame, and touching the crankshaft and teun crank to see any deviation, that would indicate bent shaft! Has to be less than .002 out of round!
I suspect the blade spindle shaft that hit the root is bent, and it is causing the vibration and is transmitted to the rest of the system. letting the crank bolt come loose!
Log back on , there should be a link in your email to get back.
I see question is still open. Did you find problem? Please rate to close.