Thankyou Paul and TC. I'm doing the one step at a time deal. I fitted the 155 jets
today
and I can't really tell any difference, seat of the pants. The bike runs great
everywhere with plenty of response and doesn't sign off early.
I'll try to dyno it again this next weekend to see if the engine liked the extra full
throttle fuel.
The only real valid comparison I think I have is Jerry Ferguson's bike with a Mark's
4-2-2 exhaust. From memory his runs a 155 jet and shimmed stock needles. Maybe this
exhaust doesn't need the aftermarket needles? frankly it runs too well at part throttle
the way it is for me to even consider playing with needles at this stage. In fact there
was no gain at all for me with shimmed needles, it ran too rich that way.
As a sidenote, I actually checked my mileage on the last tank used, for those who are
interested. Fuel light came on after 172 kms. or about 103 miles. that includes
highway,
city and stop and start traffic mixture as well as several full throttle tests today in
a couple of gears only. By and large it was mostly conservative riding the rest of the
time staying mostly under 5000 rpm.
Sam Blumenstein #795
Paul Sayegh wrote:
> 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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