carb needle question

[turtleescape]

Can anyone tell me what changing the setting on the carb needles will change? Idle,mid r.p.m.s or w.o.t.?

[fixer]

the needles are tapered, so raising the needle will give you more fuel for any thottle setting other than closed.

idle is controlled my the idle adjustment, that keeps the slide or butterfly (depending on the carb) from fully closing. the pilot jet feeds the carb when it's closed, or mostly closed, and there's a needle valve that controlls the fule flow to the pilot jet. this is usualy covered by a metal cap from the factory, but that can be carefuly drilled and removed. then you can adjust it, or replace it with a thumb adjustable pilot jet needle... but that's only a good idea on single carb bikes.

[turtleescape]

how is the adjustment made? Thanks

[trinc]

how is the adjustment made? Thanks

on the needle ?
see my page here:

http://www.pacifier.com/~trinc/katana/jetkit.htm

you can see the picture of the needles and the adjusting e-clip.
for a stock needle - go to radio shack and buy there bag of washers & install a washer between the spacer & e-clip.

for an aftermarket needle - move the e-clip 1 notch lower ( toward the taper )

tim

[md86]

The needles control your midrange mix mainly .

http://factorypro.com/tech/carbtune,CV,high_rpm_engines.html