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Try running it with the breather fully installed. Give it a fresh oil change with top quality diesel oil. Clean and sync the carbs.

I still have my venture with its single carb and she still rides amazing! I did just trade an old bike for a 1986 Suzuki cavalcade 1400 and its engine looks very similar to my venture. have an issue I’m hoping someone could figure out. It has its original 4 carbs and the bike runs but…. It is popping back from the carbs at low idle with slight hesitation. some have suggested a lean condition. I put in a new fuel filter and have new plugs on the way. the bike did sit for a few years but the fuel tank was clean . at higher speeds the bike runs amazingly well but just have this low rpm missing/ hissing pop sound coming from the carbs , which is intermittent. thoughts??

Another thing I would do is sync the carbs