Start on the top end and verify that the exhaust valve is closing and seating. Then go from there, removing the head if you find it necessary. If the engine has been allowed to get water into the valves, there could be rust or carbon on the valve and seat. Try taking the valve rocker arm assembly off, turn the engine until this piston is up, put something into the cylinder against the valve and remove the valve spring by removing the keepers, being careful to not let the valve drop into the engine. Then chuck the valve stem firmly in a small drill motor and turn the valve while pulling and releasing against the valve seat. Apply a little WD 40 through the spark plug hole to the valve seat area. Then clamp and hold the valve shut with Vice Grips and see if compression is improved. May save a head removal. Problem could also be piston or rings damaged or connecting rod broken?
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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