You lift the *piston* 1/32" of an inch, you have to move the lifting pin
more than this to lift the piston 1.32". Unscrew or remove the plastic
damper cap then you can get a better idea of how much you are lifting the
piston.
You lift and hold the piston long enough to determine what the result is.
If the mixture is weak the idle will drop straight away. If it is rich the
revs will rise and stay risen. Correct mixture causes a *momentary* rise in
revs, which lasts much less than a second.
If you haven't done it before, and particularly with HIF carbs, it can be
difficult to detect the momentary rise. You need to train your ear by
weakening the mixture until it obviously drops when using the lifting pin,
and richening it until it obviously rises and stays risen. The correct
mixture is somewhere between the two, and by going progressively less weak
and less rich each time you will train your ear and get closer to the
correct point. But of course this is the fine adjustment, you should
already have set the coarse adjustment by adjusting the jet to achieve the
highest idle speed anyway. At this point you may find you can alter the jet
by as much as 1/8 turn in either direction and have little effect on revs,
from this point adjusting the jet in *either* direction will cause the revs
to drop, and this is where fine adjustment with the lifting pin comes in.
Whether raising the piston, and the needle out of the jet, while leaving the
throttle butterfly at the same position causes the air-flow to speed up or
slow down, the volume of air to increase or decrease, and the mixture to
weaken or richen, and the fact that air flow changes speed faster than fuel
droplets and what the various combinations of these have on idle speed is
one of life's mysteries. But it does what it does.
PaulH.
----- Original Message -----
> Now my question: Do I have to press the lifting pin shortly then release
> it and
> wait for the described behaviour? or is the described behaviour noticable
> for
> the duration that I lift the lifting pin?
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