Jetting question

[mxer346]

Starting from scratch. I have a 400ex with a stage 2 hot cam +3mm stroker crank stock piston and bore port and polished head. It has a hmf full exhaust and no air box lid.attitude is about 800ft above sea level where do i start

[honda400ex2003]

170 main. leave the rest for the time being. go to about 3 turns out on the f/a. it will get you closer to where you can at least tell from the plug readings and see if you need to go up or down some more. steve

[mxer346]

Thanks steve for the info i will keep you guys updated