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[CAPT]

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[elite_dub]

I would go 2 sizes down on both main and pilot and try that if not the go 3 sizes lower on the pilot and 2 sizes lower on the main ... smaller induction less air, way less ...

[elitedio]

Smaller carb equals higher vacuum and smaller jetting. Be sure that your 28 has the jetting you want if you want to lean your jetting down by an exact amount. If it is four stroking lean it. If it is not, richen it till it does then lean it. It is an art the way I do it. What are you doing with the 28? I could be interested.

[CAPT]

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[Bear45-70]

I am changing carbs from a 28mm to a 21mm OKO. The current jetting is 52pilot and 132 main, with 50:1 oil mixture... Overall, I like how it works out..

I am installing a 21mm which may be better for throttle response... Anyone have a very good handle on what the jetting would work out to be?

Thanks,

CAPT

The jetting has nothing whatsoever to do with the fuel to oil ratio, or at least next to nothing. The jetting has to do with the air to fuel ratio (way more important to your engine's survival than whether you have a 32 to 1 or a 60 to 1 oil ratio), from which you want about 14 to 1. That's 14 parts air to 1 part fuel.