You probably want to go into town, and find a up to date Jap Bike store, With a full spares department, a clean workshop, and kean young mechanics. And ask them if theres a Grumpy Old Bloke out in the Hills, who knows how to fix Real Motorcycles.
Some of these miniature aircraft folks have some pretty impressive small engines too. Someone had a tiny V12 that was IC. There is a miniature Ford flathead V8 that even sounds the business...