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Take the slides out and look underneath. Each should be stamped 3.5 or 3-1/2. The almost black anodized slides wear better but that's unlikely to be the problem.


Also, look at the sides of the carbs. One should be marked R932 with 2-3 more numbers and the other L932 with two or three more numbers. Report back with those sub-numbers.


Set the air screw exactly 1-1/2 turns out from seated. Adjust the throttle stop screws to make them even, if possible.


If all that turns out to be good, then the pilot circuit is partly blocked.


More here: https://gregmarsh.com/MC/CarbSync.aspx#gsc.tab=0


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