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About sbabcock

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    TT Newbie

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  1. Hi Everyone, I was wondering if any of the jetting gurus could help me out with my 94 YZ250 jetting. I picked up this bike last season from a guy who had installed a 280cc kit, Pro Circuit pipe and re-jetted the carb with a 410 main (I did not look to see what pilot or needle was in there). A long story short, the bike runs ok but there is alot of room for improvement (runs way rich). I spoke with one of the guys at Pro Circuit and his suggestion was to set up the bike as if it were a stock YZ250 with a PC pipe and set the carb up with the following: 370 main, 45 pilot, 2nd clip from top with a 6EJ33-61 needle and go 1 3/4 turns out on the air screw. From here I know I can just start reading plugs and make adjustments but I was wondering if anyone has installed a big bore (280-290cc??) kit on a YZ250 and wanted to know what setup they were using which may get me closer to where I need to be. Thanks for your help.