I thought I remember reading somewhere that the 400EX is putting about 28 hp to the wheels. Is this pretty accurate? My cousin just bought one about a month ago and I'm trying to gather info for him.

Thanks

 

nope probobly more like 21-23 ....mine with yoshimura f/s and k&n flter and xr250 revbox ....makes 27.3 rwhp..........we buit a 440 kit and it has right at 35 rwhp ..
DYNOPROVEN ....that is a 33% gain over stock

 

They range from 25-27 hp

 

???

There's dyno readings all over the web with the average reading being 27 RWHP for a stocker with the throttle adjusted correctly.....

 

i work at a honda dealership and we have dynod 3 to the same numbers ..
we did a buddies with the dmc and k&N fiter and WB revbox it made 27 rwhp ...maybe the elevation were you are at makes the stocker have more.....

 

Did you make sure the throttle's were adjusted correctly.... Almost every 2000 on 400EX I have seen has gained SIGNIFICANT power from making the proper adjustment.

Heck, when mine was new, It would barely give a properly tuned 300EX a run for it's money. Then I fixed the throttle and all was well with the world.

 

what do u mean adjust the throtle what do i need to do