Modern Vespa

What are your thoughts? Ok to use as is with new rings or overbore or replace? TIA.

does it catch a fingernail? you can always run a ball hone over it if it does.

what cylinder is that? I had to ask.

Honda moped? It looks like what was on my Express SR.

Or maybe an Suzuki FA50?

If Honda, order a "B" piston and hone it.

the ball hones are great but once you get too much clearance it's over. that's what happened on my Malossi 166 kit - I cleaned it up great but then it was piston slapping so hard that it needed to go first over. not too much work to try and clean it up though.

Honda NC50. In signature. Honda Express, same cylinder as Express SR.

Here's a bad influence:

https://www.treatland.tv/SearchResults.asp?Search=Nc50

Treats is a great stateside source for moped/moped parts.

So, if I hone out the scratches and can keep the ring end gap in spec, I'm ok with the standard piston size? And yes, its an NC50.

it will be ring gap and piston to bore that say you made it or you failed

So many modes of failure, so few IQ points. Thanks. More to follow.

Give it a quick bone with the ball hone, bud.

Same here, and replace rings.

Insert new ring into the cylinder, push it down a few inches using the piston upside down, to makes sure the ring is straight, then measure the open gap of the ring with a filler gauge et check if within factory specs

Also should measure piston to cylinder wall clearance, to much and piston will rattle in cylinder.

Thanks guys for all of the insights. Hoping to get to it this weekend.

I ran a 240 grit ball hone through and while I can still see the scratches I can't feel them. No glaze anymore and a nice 45 degree crosshatching now. Installed new rings, clips and gaskets. The piston diameter, cylinder bore and ring gap are all within specs. Going to run a compression test later today. Fingers crossed.

Hone looks great. Text book cross hatch. That should do it.

There's a real good chance that will work. Nice hone job!