Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I sent a message to Jin asking him to reply and he did. I told him I heard you had an updated camshaft for the R31. So waiting on a response.

You’re the man! You’ve given me nothing but good advice! The engines love the new fuel mix.

Have you noticed the floating wrist pins have no retainer so the pin comes out and scores the cylinder wall? Just wondering what your fix is for this bugga boo.

That’s awesome man!   Yep, I’ve noticed the floating wrist pins, but haven’t yet done anything just yet… glad you reminded me. 

My plan is to get an extremely thin sheet of Teflon or ptfe, and use a small leather punch to punch out some tiny discs I can use on each side of the piston pin.  I know someone on the forum has done something similar on their H74 or H75.   

I’d planned on doing this for my Knucklehead once it needed the o rings replaced, but since using MMO the o rings definitely don’t need to be replaced… if anything the compression is much stronger than when it was new.  And I’ve put a lot of hours on my little knucklehead