jetting and popping

[markmoss77]

so i have read alot of threads on here reffering to 2 jets , a pilot , and a main , i looked my bike over and i only have 1 jet on the top of the carb (82 gs850g), the yak who jacked my bike all up said he synch'd the carbs, highly unlikely , pod air filters were creating way too much flow causing it to run lean and pop, sometimes through the exhaust and sometimes through the carb. after a little cleaning of the plugs i decided to wrap the pod aircleaners about halfway in black tape ( it couldnt get any worse ) what a suprise , i worked ! perfect acceleration , a lil dead about 2500-3500, then its a rocket , i was pleased with myself , so i went on and turned the jet screws 1 hour ( if they were in 6 oclock position i turned them to 5 ) counterclockwise , again a step in the right direction , i think the points may be a factor , spark is strong, again , im a little new any pointers from where im at now to get a little more tuning , stock bike , stock exhaust , i was told the pods were letting air and fuel in , but the popping was caused by it not being able to escape , what about modifying the stock exhaust?

[Big Rich]

First off, try to find a stock airbox. Running with a stock setup first will eliminate tuning issues later on.

If wrapping the pods in tape helped, it means you are running lean (too much air, not enough gas). But popping out of the exhaust indicates a rich condition. When does it pop out of the carbs and when out of the exhaust?

[Steve]

By the way, what you are calling "jets" on the tops of the carbs are NOT jets.

They are "idle mixture adjustment screws".

The jets that you need to replace are the MAIN jets, and they are only reachable by pulling the carbs and removing the float bowls.

With pods and a stock exhaust, you will likely need something in the 125 range, instead of the stock 115. The jets can only be "adjusted" by changing them. They are a fixed-size orifice, there is no adjustment once they are installed.

It appears that you have not cleaned the carbs properly, or you would have seen the jets. While you have the carbs off, do the full cleaning series, replace the o-rings, etc. When you re-install the mixture screws, set them at three full turns out from lightly seated as a starting point, then adjust from there once the engine is warm.

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