thanks for the info all dynos are diff. but that narrows it down a little.Let us know if you do any future mods and dyno it

 

jvc400ex is right.I don't know what my 440 big bore would measure in h.p.But in Marienville Pa. yesterday at the Tour de Forest my 440 big bore ate a raptor 3x on the pavement.The drag race was about 300'and the blue raptor didn't have anything for this honda.Believe it.1700 people registered and I don't know how many were at our parking area but the cameras were out.That's not a story that's a fact!!!! 2000 400EX-440 big bore,w.b. cam,DJ155 main,ported-polished,w.b. e-series pipe,k/n filter,17 tooth front sprockett,20"shredders,Douglas wheels,Renthal bars,Maier grips/guards,SKIN graphics...The raptor was stock,but that extra 220cc wasn't enough....FACT.........Sammy

 

If you have a 2001 you already have the XR250 Rev Box in it. I have a 2001 and i already checked, its the same.

 

The guy had to be an extremely inexperienced rider. I think we all know that.

 

brad400ex
I work at a dealership and i know for a fact that the 2001 400ex box is NOT THE SAME ...it has been proven on the dyno ....bigboy400ex

 

quad father, yamaha engines arent known for their high power for displacement (exept for the yz426 and the banshee, which has a crappy powerband) if you put a cam, bump up the compression, and bore it out a little you have the raptor beat. the ex is still 30 lbs lighter, 2 inches wider (i think), shorter, and has better suspention but that is pretty close.

 

Well my dad owns a Honda Dealership.
If there NOT THE SAME then why are they the EXACT SAME part number???

 

if they have the same number which i will check that on tuesday ...they do not revup the same on the dyno ....i can prove that without a DOUBT .......

 

I am planning on taking my brothers 400EX with SParks X-4, CT icm, Sparks/Uni filter, and jet kit. To a dyno as soon as a I get my 400EX motor back, which will be a Sparks 440 National.

I am doing it more for novelty's sake. I am curious to see what they do. Basically the mods on my brother's bike are what I rode for over a year.

Has anyone taken a highly modified 400EX to a dyno, and if so what were your numbers? I think it would be interesting since too many people want to say what you cant do to a 400EX. So lets find out what you really can do!

Adam Smith

99 400EX

 

It would take alot of money for a 400ex to touch a Raptor