ul flywheels

[markcoc]

I am debating on whether to use the stepped crankpin in my 39 Ul, or having flywheels machined to take the larger (41-84) crankpins. Are the stepped pins ok?
Anyone have any comments, ideas, or experience with this, I would like to hear from you.

Thanks,
Mark

[Rubone]

They have worked fine for 60+ years. Your results may vary!
And be aware that Indian chief pins are even smaller!
Robbie

[koanes]

Nothing to be gained if your tapers are good. Crankpin bearing surface diameter is the same as the late pin.