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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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