If its a four stroke engine, my clymers manual gives the following specs:<br />Main jet number : 104<br />Pilot Jet number : 45<br />Float height ; 9.5-10.5 mmMy 15 hp yamaha 1990 electric is flooding , i looked in yamaha parts catalog for carb kit and it lists 2 different carb assembly, 2 diff main jets. # 104 and # 136 . which one should i get and why? thanks