RE: G-62 engine
Contact Ralph Cunningham in Whitetail, AZ.
His RCU username is RCIGN1
He is the Zenoah guru. He makes electronic ignitions for them and engine mounts. His work is top notch and he's honorable to deal with. He won't screw ya or rip ya off.
Just find one of his posts here--mostly in the Gas Engines forum or the Conversions forum. Click on PM or Email and you can contact him. I think he may even post his phone # in his posts.
He's the man.
I don't know if he stocks the G-62 engines. You might buy a NIB engine on ebay and send it to him. I've picked up NIB G-62 engines on Ebay for $325--$350. You gotta watch and keep your eyes open. It takes time--but you can find them cheap.