G'day folks,
Your comments are appreciated. If worst comes to worst I have a few mates who are into their karting. One of their engine builders has a shop about 20 minutes away from me. Maybe they can blueprint and balance my engine while I'm there...!!! I'll check with my local mower shop. They're pretty bloody good, so I'll see.
They'll have the gear to give your barrel a hone, so get that done. If this cleans up the bore OK, and the bore is not worn 'oval' near the base, no need to rebore it!
Edit: the Garfield bloke I mentioned earlier charges $90, for a rebore and hone only. Customer has to source and supply the piston kit. Not bad value; the GA Spares kit for your motor seems to run $140-180 [changeover basis] from online dealers.
I had half thought of putting on EI. That would require removing the flywheel? I don't have a whole lot at my disposal to get that off, let alone the correct tools. I'd hate to crack it, it's in really good nick.
Flywheel removal on a Victa full crank doesn't require many tools anyway [unless the rust gremlin has been to visit] - just two flat blade screwdrivers, and a 13/16" AF socket to undo the retaining nut. It doesn't seat on a shaft taper; the shaft is parallel, and has a keyway for a square section steel key cut in it.
The later external coil full crank engines didn't even have a key, just a flat machined on the shaft, and a 'D' shaped flywheel bore to match.
PS: Haven't used 'vapour blasting', but my bike mechanic recommends soda blasting for alloy components; and bead or grit blasting for steel components, depending on the surface finish desired.
