My 1989 Banshee will start and run fine but won't shut off. Neither the handlebar switch nor the key switch will turn the engine off. I've read that some people have had the problem of the engine revving up and won't shut off, but mine doesn't rev up or anything, it just wont shut off. Even when the engine is cold it won't shut off. I've been dumping the clutch to turn it off. The TORS has already been removed and I've replaced the entire wiring harness and the handlebar switch. Any ideas why it won't shut off?