With out seeing what ya got as for pistons and not knowing what the ing. timing is set at or if the centrifugal advance is sticking or not and like Pete said plug heat range and one other small little thing here your gas . If the timing is set tofar advance or to retarded to far and low octane fuel and idle set to high will cause this. So first check what plugs ya got in it ya do not want HOT plugs like D21's or D18's I have the best results from either 3116 or 386 Autolites or C86 A/C's Next check timing and see where it is at and do this at full throttle and set for 27-29 degrees.Check engine idle and set low idle at 450 -475 . While ya got the plugs out look in the hole and see how far up the piston comes , If the dome stops half way up in the spark plug how ya got normal domed pistons IF that dome goes way on put ya have the hight alt. pistons and here your going to need to up the octane rating of the gas ya burn . Check the cent. advance and make sure that it is working and not sticking in retard .
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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