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.