Reply To: 6039 Speeditwin Piston Removal

[jacksonm29]

I think that the pins are supposed to have the open side down, maybe to keep from holding fuel?
Just my opinion, and I recall that the Speeditwin/ Speedifours I have worked on were that way also.
No big deal, is just install them correctly after cleaning, etc.

Keep the pistons matched with their respective bores.

As for rings, PN200576 is for standard size. If you can find em. I think new ones can be had from the piston ring guy. Make sure you get the ones with the notch for the little pin in the piston groove.

And yes that crank taper and key way look horrible. If it were mine, I’d be on the search for a good replacement. A good crank taper and key is extremely important with these opposed twins.

Mark