You'll need to check if the bore is still the standard 2.125", before ordering rings. The usual oversizes are +0.020", +0.040" and +0.060" on this diameter.

Some useful specs docos are available for download HERE - those in the numbered sections are free, while the 'Attachments' section requires paying a subscription.

The ODK Shop can supply all of the parts you will need, too.

Rings, seals and bearings: HERE

Gaskets: HERE

If your machine has the metal G3 carburettor, I don't recommend stripping it down completely, as some parts are now unavailable. Removal of the float bowl, cleaning out, and inspection of the float and needle are as far as I'd go. Along with checking that the gear drive from the governor flag to the throttle butterfly works OK.

Again, some pics would help us determine exactly what you have.

Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."