So I slapped on my knew cans last night and did a carb sync and noticed that while revving in neutral it would shoot out puffs of black smoke and the occasional flames. I was thinking that maybe it was time to screw with the fuel mixture screws? But cant really find a exact right up on here.. for some reason the search bar on here doesnt give me what I'm looking for but if I google it I end up finding a more accurate post on here but still not 100%.. I've just dumped a bunch of money to rejuvenate my bike and the more I spend the more I find I need to fix could a gummed up carb cause it to run rich but still idle(with the occasional hiccups that I hope my carb sync fixed) and ride ok? In between the crappy weather I've managed about 30miles of riding this spring and it seems to drive ok. Maybe a big sluggish but not terrible

 

Do you know if the carbs are stock inside? "Sluggish" can be a rich symptom.

 

I did some work 2 years ago with a friend. To my knowledge we changed the pilots to 48's and went with stock needles shimmed around .040 as per hawks carb post and I believe we went with 175f 178r for mains but I'm not absolutely positive

 

I know that the air filter is clean. But I dont think I've ever really messed with the mixture screws besides maybe slotting them when we rebuilt the carbs to allow for future adjustments while installed