jetting after boring and p&p??

[jak1389]

i am making my 400ex into a 416, with all the mods im going to run in my sig. i searched before to try and find the answer but nothing was close enough. what jetting would you suggest i run with the port and polish, 3 angle vavle jo, boring to 416, hotcams stage1, and my white bros slip-on with k&n air filter w/ lid still on. i wanted to get the jetting pretty close for when i break in my motor. thanks for any help.

[prepracing]

if you already had it jetted for the pipe and filter, it will be just a little lean, the bore and port&polish won't effect it that much. Probably just have to bump up your jet 1 or 2 sizes. If your starting from stock on the jetting it could be anywhere from a 155 to a 165, plus some tinkering with the airfuel mixture. Really no exact answer everybodys quad will run different even with the same mods. Good luck

[jak1389]

thanks