May have blown my 2011 outty 650xt up this past weekend. Was running it decently hard back the cottage going up that last hill on the road and started making a little noise then it died. Wouldn’t turn over got it back it started but real faintly seemed like running on one cylinder. The plugs looked fine no shavings or anything. Although I noticed it looks like oil is seeping out of the plug on the side of the case were the crank would be?
When it starts it sounds like metal rubbing. Not sure tho taking it to the dealer tomorrow. Anyone ever put 800 pistons and heads on a 650? Make much difference and what do it all intel?