Need set of rings for stock art 78.5 piston

Good luck, rings in that size range are as rare as hen's teeth.

Rand

Do you have a lathe ??
If you can't find any rings then you got nothing to lose. Your going to have to re-bore anyways so why not try this: https://www.youtube.com/watch?v=-t-Fo9oqxzs
and then this: https://www.youtube.com/watch?v=lCLIP56sKaU

Edit: I would

Guess time to go 80 mm wiesco

Even if you go 80mm, you still have 4 more bores after that.... all the way to 82mm.

Rand

If you have a good Honda dealer local, they can do a search on the P/N and see if any other dealers have it in stock, I was able to locate hard to find rings that way, called the dealer, ordered, paid with a card and they put them in the mail.

HEY Speedchaser...

i have a place that can make rings. i can check & see if that size can be made or if they have them on hand. i got some 80.00mm ones in stock and 80.50 in stock. they just need the piston pin notch taken out of them.

I think I can make them easy enough too.
Might have to try that one day just for fun.
Busy making a bending die for 1 1/2" tube.