I have just found a on-line store which has a listing for the 1966 Yamaha YG1TK bike. From what I can see from the pictures, this is the same engine (or pretty close) to that fitted to the Gemini 50. The site is:
NW Vintage Cycle Parts - New Old Stock (NOS) - Vintage parts for Yamaha and Kawasaki motorcycles.
I don't know what their stock levels are but parts are at least listed. I am about to order some bits for the gear shifter.
NW Vintage Cycle Parts - New Old Stock (NOS) - Vintage parts for Yamaha and Kawasaki motorcycles.
I don't know what their stock levels are but parts are at least listed. I am about to order some bits for the gear shifter.