can't remember exactly what it was but I had a fan-cooled 1972 yamaha ,think it was a GP433? Kinda dating myself but in 1980 it was clocked at 108 by radar on the canal. Untill the liquid cooled Kawasakis came out there was not many sleds would stay w/ it. no fun to ride; only wanted to run WIDE open- only way the twin carbs would stay in sync...