jetting help

[mjd400ex]

motor has 11.5:1 piston,stage 1 crf hot cam,uni air filter and hmf slip on. the carb has stock jets.dont know what size jet to start with. thanks for any help. it is a 04 bye the way

[SPE_Motorsports]

Take whatever jet it has in it now and go up 15-20 points and take WOT plug reading and see what that gets you for color and go from there. If it's white/grayish jet up another 10 points until you get in the ball park of a nice "cardboard-brown" color. If the plug is black and backfires a lot when letting off the throttle after a WOT run, jet down 10 points. This should help you get in the area you need to jet around. Also remember that the hotter it gets out the less jetting you are going to need... Just keep that in mind when the summer months come around, it will probably be running a bit rich... Hope this helps you out a bit!