So i bought a used 05 mxzx 440 chassis 600 motor. The ad stated it had a 08 rs motor. Not sure if its true as the guy i bought it from didnt do the swap after owning it for 2 seasons. Anwyays i fired it up upon viewing and it reved to 5k rpm for about 20 seconds then to 3k rpm. Took it out for test drive after he had , had out for the day 20 miles on the lake. So i bought it as it ran fine. Today i took it to my garage to unload from my pick up and when i fired it up it reved straight to 7k rpm an almost coming off my pickup but i had my hand on the break luckily. So i managed to get it into garage and change the plugs and i fired it up an it reved to 8k rpm ! What the heck it almost want to take off thru my wall. So i immediately shut it off. Put the old plugs in and fired it back an reved to 8000 rpm , and then a squealin noise came out of no where. Is this a belt an clutch problem ? This machine scares the shit out of me idling at 8000 rpm and smoking my belt. Need your guys geniuses minds !