Can't Get Enough
Join Date: Sep 1999
Location: Cotopaxi, Colorado
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Re: Weber jets
To check the size of the idle jets, warm the engine up and set the idle mixture screw so the highest idle is achieved. Then, raise the idle speed to 2500 rpm with the base idle stop screw. Now if you turn the mixture screws in, and it revs up, the idle jets are too big. If you turn the idle jets out, and it revs up, they are too small. Sometimes you can swap the primary idle jets with the secondary jets, as the secondary idle jets don't do a whole lot (bring in the secondaries smoother) Old Pinto's used the same jets, and just about all Fiats. You can also look at some '80's Dodge K cars, as they use the same jets.
To buy new ones, there is a place locally called B.A.P. Geon, (British Auto Parts) which is a weber dealer, they get about $1. ea.
You might also want to try a motorcycle shop, as Webers were popular.