Reply To: 1959 Lark flywheel hanging up on magneto

[billw]

Do you have another flywheel? That would be the best test. If not, check the taper to see if it was over-torqued. Turn it and see if it’s warped. Then, there is what I just went through: I had the same problem on a ’55 15. As it turned out, the upper part of the crank and the upper bearing were badly worn, which allowed enough lateral movement to let the flywheel hit stuff. I never really saw that happen before. The crank itself was .002″ worn and the bearing was worse. With the nut snug on the flywheel, try rocking the whole flywheel side to side and see how much play there is, in the upper bearing.

Long live American manufacturing!