Shaking violently is usually a failure of the counterbalance.
Some are 2 pieces with a bolt holding both sides together.
Most of the bottom end failures I have come across are from this bolt coming loose or breaking all together.
When an engine over revs these are the first things to go , as all of the potential mower racers find out if they don't pull it out of the engine.
Generally it is 4000 rpm then boom.
so Like I said I believed the 1st motor was on me with the stuck float and filling the crankcase... but it was set at whatever rpm it was set from new. This new one ran weird from the start where unless it was loaded... it did not fun at full throttle, one of the members here researched that for me and I was told to set the rpms to 3600, which when I looked back at that post I end up setting it at 3500. Would you say the possibility exists that I should have gone more conservative? maybe going from the 3200 to 3400 and see if the governor stopped kicking in?
I am going to try an arrange for warranty work, however I have a question... what would you think is the chance that one of the 20hp b&s vtwins would work? Like this one?
http://www.smallenginewarehouse.com/40N877-0003.html The only issue I see with it is, that I would have to buy a muffler or possibly adapt a muffler to it that would also work on my country clipper. I am wondering if it would last longer... possibly the life of the mower? I am really tired of dealing with eng issues! I love everything about this country clipper, the joystick steering , the flip up deck, it is perfect for my yard and my needs... if it will just stay running.