Even though Yamaha had a water cooled 250 for 1982 most racers opted to use the air cooled 81 motor in the new frame because of the poor handling and reliability of the radiator on the handlebars.....look closely and you can see the air cooled heads on Bells and Glover’s bikes, and no radiator on the bars. Yamaha fixed this for 1983 and they were a much improved machine.