FMF megamax jetting?

[bcurto]

got a good deal on a used fmf mega max..im am in upper michigan..got a 02 400ex completley stock...can i just put the slip on pipe on and just keep stock jetting..please let me know what all i should do for this pipe. thanks@

[dxcody]

Ypu will need to compensate your jetting for the new exhaust.

Probably around a 155 main.

Johndoe and pipeless are the jetting experts around here.

[BlasterEaten250]

Yes you will have to re-jet. It depends on how many disks you have in. With my e-series (also has disks) I run a 158-160 main jet with all 12 disks in and the air box lid off. With 6 disks I run a 155 main jet with the air box lid off. If I have the air lid on I can get away with a 152 sometimes. As long as you are in there I'd recommend putting a 42 pilot in to help with cold starts.

You will probably end up with a 155 main jet, it pretty much works with any slip on configuration.

[dxcody]

^^^^^

I will have to add Blaster to my jetting experts list! ;)

[BlasterEaten250]

Haha, oh I am honored! You learn it pretty quickly when you get paid to do it right lol.

[HondaRacing83]

155 is wayyyyyyyy to rich for where I am. I got lucky, 152main and 42 pilot dead on the head first time jettin it. btw get Pro X keihin jets from rockymtn. Cheaper and work great

[bcurto]

no disks will be used

[bcurto]

i only run it in the summer time...its always stored for the winter..and i usually run it between 50 degreese and 75 degreese. what should i do for jets,air filter (or just remove the lid) for the megamax?

[dxcody]

Put a 155 main in your carb, and a 42 pilot. Leave your airbox lid on.

Run it wide open, if it stumbles at WOT pull your box lid off and ride it at WOT again, if its still stumbling, you will need to drop down a size in the main jet.

An air filter never hurts to replace.

A stock airfilter isnt bad, but an aftermarket is better.

[bcurto]

what kind of air filter should i get? k&n...uni...moose? do i leave the lid off wiht a after market one? do i keep; the clips in the stock postion?

[dxcody]

What brand of air filter is completely up to you.

UNI, Moose, Twin Air,

K&N is over priced in my opinion.

Im a UNI fan.

Like i said run a 155 main with the lid on. with or without a aftermarket filter and see how it runs. Should run a little rich, then take the lid off. Hopefully pullling the lid off will lean it out and make it almost perfect jetting. But i am no expert.

Thats just what I did and it worked for me.

After you get it running good, no bog off idle, no hesitation anywhere, ride it for about an hour and pull the plug.

The tip should be a cardboard brown color and the threads black.

[bcurto]

just looked and there is alreeady a UNI filter on it...is this going to change anything?

[TheAwesomehonda]

Originally posted by bcurto
just looked and there is alreeady a UNI filter on it...is this going to change anything? No it wont.. A uni gives no better flow then stock air filter.

[bcurto]

so with this said...a 155 main jet and 42 piolet jet (try with lid on and off) should get me in a good ball park? i ride anyware from 660 ft to 1,214 ft in elevation.

[bcurto]

so with this said...a 155 main jet and 42 piolet jet (try with lid on and off) should get me in a good ball park? i ride anyware from 660 ft to 1,214 ft in elevation.

[honda400ex2003]

what up blake!!! LOL i figured that was you, had to come check for sure though :D

steve

[01boneless]

Originally posted by TheAwesomehonda
No it wont.. A uni gives no better flow then stock air filter.

dude dont even start

[400exjoker]

Originally posted by TheAwesomehonda
No it wont.. A uni gives no better flow then stock air filter.


lol.. this guy

[dxcody]

You have a PM awesomehonda.