OK here is the story. I put FMF Fatties and K&N air filter on a stock 2002 Banshee. I moved the slide up one position and put 290 mains in it. It ran perfect from 90 degree days in the summer to 4 degree days this winter. I took it out in a snow storm recently and it suddenly started revving really high and then going back to an idle then back to revving really high all by itself. It did this for about 20-30 seconds. It ran perfect after that Ever since then it will run perfect up to half throttle. As soon as I give it more than half throttle it bogs and backfires. I disconnected the tors brain under the gas tank. The sensors on the p-brake and carbs are still on but not functional because the brain is disconnected right? Here is the really starnge part. When I check the plugs they are brown on one side and white on the other. Each plug has a white side and a brown side.
I am begining to wonder if it may be electrical. I am always burning through headlights. It has always burned through headlights even long before this problem developed.
It sounds like it is not getting enough fuel for some reason. Any ideas what could restrict the flow of fuel?
I checked the choke tube between the carbs. Any suggestions are very welcome. I tried everything I can think of. If anyone can figure it out it will be someone on this board.
Thanks,
Troy