I have a Yahama YT5700 mower, 16HP rated, 573cc. The 18Hp engine is also 573cc. The only difference I see in the specs is the main jet size in carburetor...
16Hp Main jet is #102, Air jet is #56; 18Hp Main jet is #132, Air jet #56. Will just changing the jet provide 2 more HP? If so what is the drill size of #132 jet so I may drill out the #102 jet?
