go to your dealer and have a compression test. if you blow plugs, your compression too low and 99% your cylinder\ piston are started to go down(ripped). your pto crank bearing moved slightly toward the connecting rod balancer depriving that cylinder from requiered lubrification. we have several sleds that went down with this problem.
Compression checks are very poor tests..... Let say 1 guy gets 125 pounds in 1 hard pull.
The next guy gets 125 psi but it takes 3 hard pulls to get there.
Same results...... Completely different means to get to the number.
Compression tests are not a good test.
One of my posts talks about low to mid performance problems......max RPM problems are really the first sign of a top end losing ring seal.
So...... For the most part any performance problem where you feel performance is sub-par anywhere from low thru wide open you should do a leak down test.
These test are done with compressed air..... And a % of ring leak is measured.
You will have to hold the clutch with some type of device of your choosing to hold the crank from spinning.
This summer we plan on starting a new in shop YouTube weekly video series to show many shop procedures we preform that Polaris dealers have not been taught in the Polaris service schools.
Dan
Dan