Yes it's important to center the jet, and yes it's easy to detect.
The best way is to remove the air filter cover, reach in with your finger and
lift the piston, let it drop. It should fall all the way down, with a solid
"clop" sound when it hits the bottom. If the jet is off center, the needle
will make contact and slow the piston down on its decent, sometimes even
stopping the piston from falling all the way down.
You can also tell by running the car. Since the piston will not be fully down
at idle, the engine will tend to run poorly at idle, while being fine at higher
throttle openings. The more off center the jet, the higher it will hold the
piston, and the worse the problem.
Centering the jet is a fundamental part of doing the carburetors. So
fundamental that I wouldn't be overly worried about the shop not doing this.
They are far more likely to not get the carbs in proper synch or have the
mixtures set optimally. Basically, if the car runs well through its range when
you pick it up, it's probably done right, or right enough at least.
>>> Richard B Gosling <Gosling_Richard_B@perkins.com> 06/01 3:59 AM >>>
How can I check they have done the
job properly? I have heard that it is important (and tricky) that the jet is
centred - is there some easy way I can check they've done this right?
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