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#1
03-11-2024, 10:47 PM
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Kohler K Crankshaft Balancing.
I just put the engine back into the 149 today. I rebuilt it a couple years ago, not long after getting the tractor and I left the balance gears out at that time. It does seem to shake a lot, but I don't really remember how bad it shook before. I've just found some info on a crank balance kit from an outfit called Kirk Engines. Its basically a weight you add to the crank, particularly if you leave the balance gears out. In his article he discusses differing weights in oversize pistons and pins. I did not compare the complete weight of my oversize piston to the stock one I replaced. He claims the added weight will definitely reduce vibration as they are "poorly" balanced to start with. I can make and install my own weight kit patterned after the Kirk one.
Has anybody static balanced a crank and piston set from a K series, particularly after boring oversize? I'm probably going to fire it up tomorrow and if the vibration seems excessive, I may just pull the engine again and take it apart. Just wish I had come across this a week ago when the engine was stripped and the pan and flywheel were off anyway. 
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