My 1983 Yamaha seca has bigger jets ...racing 4to1 exhaust its got dead spots between 2-3 an 5-8 .it seem to run better with stock jets and stock 4to2 exhaust... But I want as much power as I can get out of it....
Question 2 ways the difference in the 750 and the 900 ......is the 900 just a stroked 750