Let me say I had a customer that had bought a tune up kit from me brought his motor in a week later. It was because He and his "Old mechanic" neighbor could not get the flywheel off. It seems his neighbor had been using a big screwdriver and hammer to remove the flywheel on his antique Johnson for 30 yeas and never had a problem. Evidence showed he was prying on the magneto base hard enough to push in the rear mount for the rewind starter and crack the water jacket when he hit the top of the crankshaft with the heavy hammer. Yes, he needed a new magneto base as well as several other parts.
Lesson – never under estimate the amount of damage a lack of knowledge may cause. That is why we are here to answer your questions. . . 😉
