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Message: [QUOTE="XtremeAir125, post: 147426, member: 24019"] Recently, I did the top-end in my 99 CR125 w/wiseco pistons. I took my bike to the dealer afterwards and they jetted it perfectly to what FMF suggested. I have a FMF Fatty with a PowerCore II Shorty Silencer, and Boyesen CarbonFiber Reeds. I also used a BR8ES spark plug at the time. Once I got my bike back, I putted around my lawn for about an hour, taking my time to break it in. After that, I went inside for about a few hours and came back out to have some fun ;) So I took my bike up the road and revved the hell out of it. I was in 4th gear and all of a sudden i lost the power...nothing. When I got home, i tried kickstarting it and it was stuck. So i took apart the top end and noticed that the piston had scuff marks on all four sides. Did I forget to put more pre-mix oil in the lubricate the piston? Or was it cause I used a hotter spark plug? Any suggestions? Thank You! [/QUOTE]