[Mike400ex]

What jets should I be running with my mods 99 400 ex 416 bore stage 2 hot cam ported and polished head sparks racing header to power core 4 muffler mesh air box lid foam filter currently running 42 pilot and 155 main.. any help appreciated thanks

 

[SlammedRanger]

45 pilot jet. And i would think around a 180-185 main jet. Depending on your altitude. Welcome to the forums!