Opti-2 claims "single mix", yet ratio varies depending on package size. WHY???

[slowcar281]

RTEK's do the same thing. I drill the jet out on them to the next size larger.

Are you drilling the pilot jet as well as the main jet?

I’ve had decent luck using the # 40 Suzuki pilot jet and the larger hole throttle plate in most of the duraforce mowers I’ve worked on. I haven’t had to enlarge a main jet yet.