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Old 03-15-2013, 10:09 AM
Brian Martin,Freelance adviser
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Originally Posted by malc View Post
Every time I have the carb off I adjust the idle screw, getting those little
slots in the bore just right.
But when I adjust the carb on the car that setting gets invariably lost.
So today I took the carb off sat it on the stand and set the idle screw to just touching, like this.

Then I counted the turns to get the slots right, on this carb it was just half a turn, waaaaay off what I actually thought it was.
You might have to figure in the return spring tension when the carb is back on the motor, quarter turn I reckon.
In my case it didīnt need it.
Now if I lose my adjustment with the carb on the motor I can reset to just touching and add my half turn.
That is exactly what my brother showed me when I took the carb off the Gran Sport, count the turns on all the adjustments and record them so you can start where you were, you knew it was running, and adjust from there for the fine tune.

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