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nice 80 cb750f carb problelm

coxey2

CB750 Member
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west ky
High guys, just starting messing with my new 80 750f . I have cleaned a ton of single cylinder carbs with great results. I got these back together and the bike runs fine but #3 cylinder is dead. I sprayed carb cleaner into the carb sync port and it runs fine so I have carb problem with #3. With the carbs on the bench everything looks fine; the slide and butter fly open like the other three carbs. Any idea where to start? thanks
 

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Plugged idle passage or bad air cut diaphram on the side of the carb.
 
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