what kind of horse power

[rynb15]

Im just looking for a guess on my bikes horse power. i dont race and i probably wont mod any further. Just curious. 04 400ex, stage 2 hotcams, lexx slip on, no lid on air box. i know its not much for mods but what have similar quads put down on the dyno? This bike is around 28-29 hp stock right? Thanks

[2006 400ex slsd]

yes 28-29 is stock if i had to guess yours probaly has arond 35:D

[rynb15]

thanks, thats not 2 bad i guess.

[2006 400ex slsd]

no prob:)

[jcs003]

i seen 26 on the dyno. you will need to do alot more to get 35 hp out of a 400ex engine. i had a 435cc hi comp bike with cam, port work, carb and much more and got 32 torque and 34hp. it was tuned perfect.

[slightlybent47]

You’ll be lucky if you have 30 hp. The slip on is the most expensive mod that yields the least hp. The best slip on is only worth maybe a 2 hp gain. And with the air box open you can add maybe 1 more for a total of a 3 hp gain.

[Muzzgit]

Mine runs 35.4 hp with 406 hi-comp piston, stage 2 cam, port and polish, Rocket slip on, K&N filter.

I think you'd be lucky to get better than 30. You want power? you gotta spend $$$.

[rynb15]

ya, money is something i dont have to spend at the moment. I think ill just save up and get a 450 later on if i need to go faster. my 400 will work for now though.
I used to have a stroker banshee that could destroy 450s. But it blew up. was a fun bike(in a straight line:) )

[childert79]

Sorry for jacking your thread but what do you think mine will do? I'll be running 93 pump. And which of the 2 slipons do y'all think i should use?
P&P Head
Hotcams Stage 2 cam
Wiseco 11/1 416 with base gasket elminated and xr400 headgasket
FMF Powerbomb Header w/lrd slipon or FMF Powercore 4
Insane Performance Airbox w/K&N Filter and outerwear
05 450r carb with hotstart blocked
Amr Revbox

[jcs003]

sometimes your barely changing the horsepower. the powercurve will change with mods more than anything. it takes alot of work and money to get good numbers out of a 4 stroke. espically an air cooled one.