In the years that it was produced many remarkable items were offered, as you can read on the "Brochures" pages. There was a real "race-kitted" version. Yamaha supplied the "GYT" kits for the YL1 with nice chromed upswept exhaustpipes. Yamaha made these kits for many bikes, you will get a list later. A friend of mine in the UK had one of these (unused kits). One of the British dealers who offered complete "race" YL1 bikes were "Finch Brothers" of Manchester.

Yamaha YL1, GYT kit

Sorry guys, I do not have the Partnumber and the Computer will surely say: "NA" or not available anymore......!