2003 40 HP Yamaha

[j nye]

change the exhaust tuner to a 50 hp yamaha will give more speed they choke the 40 down to 40 hp this way the carbs are larger to but you dont have to change them the tuner will free that bad boy up . go up 3 thousants on your main jets if you change the tuner to the 50 hp .it cost about 50 bucks new from yamaha.

[RECONER]

Thanks for that info J yne