Thanks for all suggestions everyone. Today I fitted a K&N filter element and shimmed
the
stock needles .020" just to keep it safe. I'm at sea level most of the time, up to a
maximum of 500ft. above around our city. The weather at this time of the year (our
fall) is cooler and crisp with high barometric pressures so a little fatter on the fuel
will be in order. The plugs look O.K and the engine runs fine everywhere. The only seat
of the pants feeling I got with the air filter was a slightly stronger rush of V-boost
as it cam on. Is this in my head? Or can that element actually provide some noticeable
improvement? I'll let you know if the dyno shows what I thought I felt.
Sam Blumenstein #795
Paul Sayegh wrote:
> "C.O.M.E. Racing" wrote:
>
> >
> > Is it advisable to simply try a # 155 main jet to take care of the top end fuel
> > shortage, or is a "Factory" Titanium needle in a stock main jet tried at various
> > clip positions, another useful approach?
>
> At full throttle the engine is running on the main jet. The needle is
> insignificant since its area around the orifice is larger than the restriction below
> it which is the main jet. Changing needles may throw a wrench in to your tuning
> since it seems to run good everywhere but at top end
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