[David a Calkins]

to me the engine can be repaired ,with out pulling it down ,and to [mic] all parts you don,t what you have ,i have rebuilt many of the kohler engines ,,and found that none of them are very true inside ,,meaningthey were never machined true to begain with ,i have found the cam thrust faces to be off as much as ,008 on one end and .005 on the other end ,as well as in the block as well ,i machine the cam and re set up the clearance ,and have made a lapping tool to repair the block as well ,to be sure the cam is not the problem any longer ,.and if the crank is out of round ,its time to have it turned ,and new rod installed ,and i balance my engines as well .no i dont do this for a living ,just as a hobby ,i,m a retired machinist ,and restore old tractors ,the first tractor i did was a 125 cub ,and it knocked when i sold it .and i never wanted that to happend,so i found out why ,hope this helps .David