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I just purchased an 1979 Suzuki Gs425. I have noticed a few issues so far. The bike runs, drives, and shifts but, I am getting this puffing noise out of the carburetors during idle and low gear. The puffs actually rattle the pod filters. I’m not sure what is causing this? Possible over fuel? Fuel mixture off? Vacuum leak?
No no no! Spitting out of the carburetors is a lean condition probably caused by improper jetting with open pipes and probably cheap pods. You are most likely going to damage the motor if you continue running it like that. You might also have a valve adjustment problem or bad carburetor boots or O-rings. I know black plugs indicate a rich condition so you probably have several things going on that need correction. Just running too rich would eventually fowl the plugs and stop firing.
 
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