Problem - When the engine should be kicking in (around 6k rpm) there is a flat spot/loss of power. Bike will keep speeding up but slowly. Almost like there is no difference between half throttle and on? I'm thinking maybe a clogged main jet? Ordered a fuel filter but pretty sure that is not it. Any other ideas? I'm afraid to break into the carbs and look, lol) I've worked on dirt bikes with one carb, don't understand the 4 carb thing, haha Extra NON-pertinent info. Bike had been sitting for 4 months with the gas drained from the bowl and most of the tank in garage. New gas put in and bike ran for more than 40 miles in current condition. Starts awesome, idles awesome, runs up to around 6k rpm awesome. Also i would like to sell this bike. Already have a replacement. Found a great kid that knows his shit and wanted to buy it before we discovered this problem. He's hesitant to spend money on it when not really sure about the problem which i totally agree with.