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OK , So now that it is apart take the opportunity to check out some other things which have been a problem for others in the past.  If you look back to the Bushman thread , you can test your balance shaft bearings this way.  Essentially remove the oil pump and the balance shaft gear .  This will allow you to rotate the balance shaft from either end (oil pump or drive side) . Do this by hand , listen and feel for any noise or roughness.  The shaft should revolve smoothly and quietly.    Don't forget to check motor mount bolts for tightness and the exhaust system .   Can you recall if this was sudden or a gradual change ?