bought a 1956 Yamaha 100cc TwinJet that my son is rebuilding for me.
New points and correct timing got it running kinda OK but not altogether reliable.
Symptoms indicated bad crankshaft seals which means a complete engine teardown
to replace them. All apart except we needed a puller to take the rotor off the crankshaft.
Photos show a simple threaded thing that screws into the rotor and pushes it off the
crankshaft. But what thread is it, eh?
M8 is too small, M10 is too big and there ain't no M9.
E-mailed a fellow CVMG member who's had TwinJets for years and he sez:-
Those cunning bastards at Yamaha used an inch-sized thread for that puller.
Sure enough a 3/8"NC bolt threads right in there.
WTF, EH?
New points and correct timing got it running kinda OK but not altogether reliable.
Symptoms indicated bad crankshaft seals which means a complete engine teardown
to replace them. All apart except we needed a puller to take the rotor off the crankshaft.
Photos show a simple threaded thing that screws into the rotor and pushes it off the
crankshaft. But what thread is it, eh?
M8 is too small, M10 is too big and there ain't no M9.
E-mailed a fellow CVMG member who's had TwinJets for years and he sez:-
Those cunning bastards at Yamaha used an inch-sized thread for that puller.
Sure enough a 3/8"NC bolt threads right in there.
WTF, EH?