Hi there.<br /><br />A friend of mine has a New Yamaha 60 4 stroke on my Buster M. It's brand new with injection. Previuosly, he had Suzuki 50 (4 stroke) but changed it on Yamaha to get the higher speed. <br />With Suzuki the top speed was 62 on 6000 prm with 16 pitch stainless prop. <br />Now the top speed 61.5 on 5800 with the 15 prop. <br />But the problem is that the engine gets 5800 and not more. And never mind it's 11*15, 13*10 or 10 3/4*15 pitch. <br /><br />I wonder what's the problem? <br />Someone advised to change the program that drives the engine. If it's real how can I do that?<br /><br />I appreciate if you can help me.<br /><br />Regards, Sl.
