Have a 97 xc 700 that when your riding the sled will loose power and then it comes back and there is a back fire . Then we stopped and it would not start ( no spark ) then we picked the sled up and bouned it and slided it slide to side then it started . But it happened again later on ......hmmmm. We also put a ground cable from engine to sled ( chassis) to see if that would help but it did not. So I come you you " All MIGHTY HCS " for a bit of direction. Thanks .............BTW its my little bro's sled. He will be a HCS member soon! later.