Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Have you taken a look at the belt that is between the engine and the flywheel assembly. I have seen these belts become damaged and cause a lot of vibration. I would look at it prior to anything else because normally the flywheel doesn't get out of balance unless you jam something in the machine and damage the flywheel. I have seen the belt get damaged just from engaging and disengaging the system. Normally what you will find is side wear on the belt in spots that cause the belt to fall deeper into the pulleys as is goes around them which will cause the vibration.
If it is not in the belt, which since you replaced it and didn't solve the problem then I would think that the belt would not be an issue the the only other place it could be is in the impeller or flywheel. You could remove the impeller and try to find someone that could spin balance it but it will be hard to find them unless maybe you have a good machine shop nearby that can do it. The other option would be to replace the impeller if you can find a new one since this is an older machine it may be difficult to find a replacement. It is odd however that it would become damaged or out of balance unless something was jammed into it. I have no other suggestions, I will opt out and maybe one of the other experts here will have something to add that will help to solve your issue.
Check the blades on the drum axle, for missing blades or stuck blade that is not flinging out. Just like a fan blade, when it looses one blade, it shakes the whole engine.
OK,are all the blades free to move, and not stuck? Thanks,
Ok, just know that a single blade can cause the vibration!