jetting help

[bottlefed1]

I know there are a billion and one threads about jetting but I couldn't find one that answered my quest so here goes.

I have an 07 400ex I recently added the fmf powerbomb and the other day I installed an amr monster coil plus I removed the spark arester other than those 3 mods its bone stock even have the air box lid on. Do I need to rejet the carb for those mods or is stock jetting with stock settings ok .

you should rejet after any intake or exhaust change

[bottlefed1]

ok are there any sugestions on which jets to get i already plan on getting a 40 piolet but what about a main for the mods i have

[Snipe]

Your pilot would most likely be fine your main jet is gonna be a 148 main with my whitebros exhaust I had to go to a 152.

Since you just changed the pipe and not the muffler I dont think you would have to to more than a 150 if anything at all.

[oleboy87]

well i have th powerbomb with a hmf s/o and im running a 155 with the lid on.. but thats a start.. you may have to fine tune it from there..

[Snipe]

Your only tell would be how does the quad react when riding dose it stall out in certain rpm ranges? run it a bit and then pull the spark plug what color is it? white would indicate lean and darkish or blackish brown would indicate to rish.