Got the sled out for the first real run of the season today and i have found a few unwanted problems. First i realize i heard a squealing noise coming from the belt..I have just bought this sled over the summer so i am unsure about how old this belt it. As i was driving it i would hit around 90mph and everything would be running fine and then the rpms dropped and it began to bog down.. i stopped and let it idle for a second and took off again and it was fine, not bogging. but this happened a few times. i took the plugs out and the bottoms were black and dry. Last problem i had was shutting it off. i hit the kill switch and it still ran, so i shut the key off and it still ran, so then i took the teather off and it slowly shut off.. Like i said, i just bought this sled so i am unsure about how its supposed to run but i know its not right. any ideas for any of these problems would be greatly appreciated.