"C.O.M.E Racing" wrote:
>
> For Campbell and others who've been messing with the pilot jet deal. I
> tried some #157.5 jets in my PAJ-2 to replace stock original #170's. At
> the same time I removed .020" shims from my stock needles. I have #155
> main jets, the pilot screws are still about 2.5-2.75 turns out. I didn't
> change this. I still have diaphragm springs tied (5-6 turns) otherwise the
> engine is stock but with Mark's 4-2-2 exhaust.
What is the main purpose of tied (or weaker) diaphragm springs? Doesn't
seem like it would change the mixture, because even though the needle
may be retracted further for a given throttle setting, the air
passageway is also bigger. So the effect would be like you had the
throttle open further than you actually do. Thus, "wide open" and
running on mains would occur at a lower throttle setting; is this
correct?
Sam, thanks for the info on your setup. Do you have a TourMaster, or is
this on a stock engine?
Gary Rathbun
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