Hey i recently got my rebuilt polaris 580 xlt running, I cant get the track to run faster then 10mph, underload, the track will spin fast tho when its lifted off the ground tho. I know the engine is good rpms at 7000+. I checked all 3 cylinders have spark, and new, non fouled spark plugs. The primary clutch engages at around 4000rpms(gold spring), ive cleaned the carbs, changed gas to 91 fuel type. Ive tried a new belt too, it smoked it rubber tho caked all over the primary clutch now. I rebuilt the secondary clutch to, i rebuilt it back to spec, used low temp grease for reassembly, turned sheave 1/3 turn for helix install/setting 2. Any ideas on what it might be, hopefully cheap fix. Im already 2k$ cad in the hole with this sled. sidenote tho could it be my secondary clutch spring, its easy to compress with one hand, im not sure how much resistance these things should have?.