Fitting/filing oversize rings to a standard bore I believe would be preferred over boring. leaving an end gap of .012"-.018" would have best results. That is unless of course you're replacing the piston with an oversize. Don't forget to chamfer ports and break the sharp edge ever so slightly, I susp...

part numbers 51747 std, 51748=.010" O/S, 51749=.020" O/S and 51750= .030".
2.000 inch standard bore.

That I D is a reference to the IPL listed on this site indicating a revised "R" illustration that was created.
Just drop the R.

The 2J fan car used a JLO 760cc twin carb, fan cooled snowmobile (Arctic Cat Panther) engine, which was plagued with reliability problems. Never saw it run but did get to see the Pennzoil Chaparral run in 79, 80 and 81. It was also another great Jim Hall innovation.

let me know if you are still interested as I think maybe the PM I sent, didn't send, its in the outbox and not in the sent box.

Dave,
As I recall from talking with Jim at E.Avon way back, he could do the Hartman belt drive drums as well, correct?
He also stated that the inner side of sprocket area shouldn't be machined or altered in anyway for it to be a good usable core drum.

It has been discussed on ebay discussion forums that soon a 180 day return program will go into effect in Nov-Jan 2015 on all items, including all these vintage kart items. It would seem that one could run your rebuilt kart engine a full season and return it for a full refund in oct. 2015. I know it...

I see he's move his location but still in Pa. He skunked me on a 58128 McC crank years ago, turned out to have a turned undersized rod journal and It wasn't discovered in time to do anything about it, but I didn't forget, I know Jeff got hosed by this FRAUD, as for me, never again with this Alpha Ho...