Hey guys. Fall of 2015 I picked up a 1997 mxz 440 fan. Performed some minor tlc (replaced belt, spark plugs, fixed choke, etc.) Put about 300 km on it. Ran great, thought it had plenty of zip for a little 440 and would even pull the skis off the ground! So I unloaded it last week. Started it up to go for a ride, let it warm up. Idled great. Revved it up and the engine started to runaway. Sled started to take off so hammered the kill switch. Fired it up again and it instantly took off. I replaced the carb boots between the carb and intake. Tried it again and its still running away. I think I'm getting some extra air somewhere. Anybody have an idea of what could be wrong? Would be greatly appreciated.