Re-checking oil pump setting and it wasn't even close to the mark. I know it was set right originaly. Started flipping the mirror around under there and found two funny things. One, the arm did not return fully to the idle position, it was stuck. The cable was fully extended past the pin, but the arm was stuck short of the cable ball end. Could repeat getting it stuck by moving the throttle back & forth in the 3/4 to full throttle range, at least it did it more consistantlt this way then any other way. Most of the time I had to nock it free with my finger to get it to return, just snapping the throttle didn't do it. Two, when the arm is totaly returned, the end of the oil pump arm is resting on the motor mount strap. Or at least it is very, very close, & it does look like there is a witness mark on the strap from the arm. Not sure if second problem caused the first? Weak pump spring? What is holding the arm up? Not sure if motor vibrations are able to jiggle the arm free and this is never an issue. But I can see why some are fouling more plugs then other d/t how stuck that arm is. Note, to date I have not fouled a plug.

Mine was stuck when Ifirst got my sled. It was going thru oil like a drunken sailer was going thru booze on shore leave. Dealer found the problem and corrected it. Sled is really good on oil now. Not quite as good as a 600 H.O., but totally acceptable.

Has anybody checked their sled out? No more then 10 mins to do. Up date note, you need to hold the throttle flipper to the bar for aprox. 15 seconds, then release & check if it returned all the way.

I had the same problem, started to foul plugs for no reason, but there was areason the infamous stuck oil lever. I cleaned the area with degreaser and added a very light return spring to return the oil lever when the throttle is released, seems to work fine now and the plug fouling went away, Must be one of the many "Scrutinize Everything Overlook Nothing" things that got overlooked with the Polaris engineering department.