I have a 1994 Polaris SLT 750. just had a brand new engine put in and carbs cleaned. The only problem is i keep going through spark plugs, they keep fouling out on me, after about 3-4 hours of riding time the ski will start to just slow down out of no where and die. ill pull the choke out and it will be fine again for about a couple of sec till i start getting speed agian it will slow down (not give power ) or die. ive been cleaning the spark plugs off and putting them back in and they will last a little longer but im just tired of changing spark plugs so much i shouldnt have to.