2002 YAMAHA BANSHEE WILL NOT REV

Could be related to TORS, specifically the safety switch in the clutch/park brake assembly. If it's defective the engine won't rev. Solution: look for a TORS removal kit.

Sounds to me like you have a jetting issue.What carbs do you have...stock 26's? Also any porting or pipes and what is your elevation? what mains and pilots are in them now..

I wouldn't run your bike with no exhaust.that isn't gonna help.If you have spark and your getting fuel and it starts...You're problem is jetting.If your crank seals were bad it would run but just not good at top end.There's no need to tear the top half down and split the engine cases just because you can't get good throttle response.

When was the last time new crank bearings and seals were installed? With all the work you have done on the carb I think the problem is the crank seals. But, check the bearings. At rest, the flywheel must be rock solid > no movement up or down, left or right.

If the bearings are solid then only replace the seals. Chances are the engine can stay in the frame if only the seals are being replaced. Best part is that seals are a low cost item.

One other possibility is a partially blocked exhaust system. Check the exhaust first. Checking the exhaust doesn't cost anything. Disconnect the exhaust pipes from the motor. Excite the neighbors by a quick ride down the street with no muffler. If the problem is instantly fixed then get a new exhaust.

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I have a 2004 banshee at the yamaha dealer being worked on.It would not run when i took it up there they cleaned the carbs and put it back together it will start but when you rev it, it holds itself wide open and wont shut down unless you pull the plug wires.they also checked the floats in the carbs said they where ok. they think it is a vent issue with the gas tank or the fuel shut off valve.IS THAT POSSIBLE