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Message: [QUOTE="MXP1MP, post: 1157093, member: 20581"] How can you been running stock jetting unless your running a low compression head My '06 YZ 144 I had eric do for me siezed on stock jetting within 40 mins on 114 leaded trick race gas. But I head the high compression head mod's done. I had to go richer up to on the pilot and 4 on the main jet when I got it back. best mod I did to the bike was put a 14 tooth counter shaft sprocket on it after I got it back. I run 14/48 out doors and so far 14/49 seems to be working really good on the tighter indoor stuff. I just got a new top end of gorr with the gasket kit and came with that damn moose gasket kit I ran one of those before this last top end and the damn cylinder base gasket leaked after awhile around the edge's the damn material they use is to hard no problems with the cometic or athena's they use a softer more rubberish material that seals better so I have to get another gasket kit. [/QUOTE]