will any header pipe work? if i buy one and try to get it b4 the weekend would i need to rejet? if so what size jet should i get?

 

if it has a pipe it should already be jetted but if not i ran a 160 dynojet but it all depends. if it was me i would get the powerbomb. i also ran the 426 kit so i woulkd jet yours 155 or 150.

 

i wish i knew more about this wheeler. i picked it up used on ebay. good buy but know nothing about it. no one thinks its stock but it is slower then stock. maybe friday night me and the guys will just have a few drinks and tear into it and see what the heck it is exactly

 

so we tore into my 400 last night. the results were shocking to some. stock jets with a k&n filter and slip on pipe. ended up jumping to a 178 and its still a little lean. the only other size we had was a 195 and that was way to much fuel. rode it good and hard today. those new tires i got really bite. ever one else would spin up hills and i would wheelie up them. i wish i would have brought my camera when the grizzly rolled down the hill and parked on a tree tho.

 

all hondas have noisey engines but there reliable as *****, every one i have ever owned ticked old or brand new.

 

i have a buddy put 11.1 piston stock bore and a stage one cam with the white bros pipe and muffler and he smokes 450 s maybe its cause he 110 lbs ??? whe get a 450 by 3-5 bikes in a race

 

The 450s (all makes) are the same DOHC engines used in the 450 motorcross engines, your would have to spend big bucks in a 400ex SOHC engine to wake it up enought to go against them.

 

Vos83, I believe Jasonb meant to say the stock rear sprocket is a 38, the front is a 15 for years 99-04 and changed to a lower gearing of 14/39 in 05. Do you still have the stock rev limiter? I wouldn't worry about over rev in 5th gear unless it's an after market limiter with internal motor mods. I do suggest trying different sprockets to get the full benefit of 5th gear. Front sprockets are cheap compared to the rear but 1 tooth on the front makes a lot of difference.

I agree with kgcool's comment about the ticking noise that Honda 400ex motor's make but it never hurts to have a mechanic listen to it.

Jasonb, I wish I would have known about the motor mounts. We used the 450r mounts and a welder. Did the kit come with radiator mounts as well? Even though we had to do some fab work it was still better than putting more money in the ex motor that was good before I had to oversize everthing in it.

 

I dont really want to go any bigger on the front due to the case saver not being usable then. i should really do something in the rear tho. i think it is geared way to low. i still do have the stock rev limiter. but we came to the conclusion that my clutch is not stock. it pulls much harder then a stock clutch.

as far as the ticking goes my buddy will check the valves when he does his in a couple weeks

 

<div class="FTQUOTE"><begin quote>Originally posted by: 03bansh33

dude the header is stock an fmf bowerbomb will give you up to 10% hp gain when i put mine on i could tell the diff.</end quote></div>

if you're gonna get a powerbomb, why not get a cancer pipe (megabomb, i just like to call it that because of the MASSIVE swelling/expansion chamber) I bet you could mod/rebend a megabomb to fit