hi all.yes i;m a newbie here and that we have both a atv and a snow machine.i don't drive them but ride bi--- on them. my accident 6 years agoe left me with no hands .one eye, part of rt leg messed up can;t hear worth a poop butt still a force 2 b recond with..we live in northern michigan north of gaylord. so lets see where this goes..last year the 1994 arctic zr700 drove fine,this year runs fine but when she gets on it and starts 2 acclerate a clunking sound is heard.i had her tighten the belt still klunking.if its raized up and engage the clutch all sound and feels ok .i can;t see anything broken where the clogs are to turn the belt.also i had her take off the cover where the gearing is and all looked fine. the sled has 3500 miles on it ;;yes this is our first snow sled besides all that WHERE'S THE SNOW,, thankx 4 any advice..larry