stock h.p. 2004 400ex?

[atv_man2007]

does anyone know the stock horse power of a 2004 400ex?

[Hondamaster5505]

25-26

[smorris1]

Isnt it like 28?

[Hondamaster5505]

Originally posted by smorris1
Isnt it like 28?

everyone says that but in reality its 28-29 at the crank, 25-26 at the rear wheels.

Im not too positve on the crank numbers.

[atv_man2007]

thanks guys got 3 posts in under a minute thats why i love atvriders.com

[Hondamaster5505]

Originally posted by atv_man2007
thanks guys got 3 posts in under a minute thats why i love atvriders.com

yeah, the only forum like that too. Many others you wait like 10 days for a response.

This forum is more like aim:eek2:

[08400EX]

Here is a "sneaky" way to see what HP almost all the manufactures report to CARB for Executive Orders (emissions certification) for ATVs and Off road MCs. Some of the reports even have actual testing results.

It helps if you know the exact displacement of your engine, (for example 397cc for a 400EX) to find a specific make/model.

You can also change the year in the last 2 "columns" to see different years. (example, change both "2008"s to 2005 in the link below). Using this "year change" you can go all the way back to 1997 or 98.


http://www.arb.ca.gov/msprog/onroad/cert/ofhrv/ofmcatv_comply/2008/2008.php

[boosted3g]

25.5 kw or just over 34 hp

I thought it was 27.3 or 27.7? I know it was somewhere in 27.

[Ruby Soho]

Originally posted by FoxHondaRider
I thought it was 27.3 or 27.7? I know it was somewhere in 27.

ive seen it was 27 so many times

i just go with 27. it doesnt matter really if your off 1 or 2

[08400EX]

Quick snapshot of part of the 2002 400EX CARB EO cert.

[07trx400ex]

Using the data from the California Environmental Protection Agency(provided in the link by 08400ex), and converting kw to hp then that would mean:

08 400ex: 34.2hp
08 450r: 42.6hp
08 Z400: 36.6hp
08 Ltr450: 41.6hp
08 YFZ450: 38.6hp
08 Raptor700r: 46.9hp
08 250ex: 16.8hp

Originally posted by 07trx400ex
Using the data from the California Environmental Protection Agency(provided in the link by 08400ex), and converting kw to hp then that would mean:

08 400ex: 34.2hp
08 450r: 42.6hp
08 Z400: 36.6hp
08 Ltr450: 41.6hp
08 YFZ450: 38.6hp
08 Raptor700r: 46.9hp
08 250ex: 16.8hp

i think those are at the crank

[07trx400ex]

I was just trying to give a reference point for some other machines I thought it was very interesting to see they stacked up against each other with the numbers coming from a government source.

I was playing around some more and a Bombardier Outlander 800 has 62hp.

[Hondamaster5505]

There is no way the 400ex puts out 34hp even at the crank..

EVERY single 400ex dyno I ever saw in my lifetime, even piped, only had in the 25-27 range

[07trx400ex]

That information is from a government website so they would probably have big liability issues if there was bad information on their site.

[07trx400ex]

It also depends on if you are using an engine or chassis dyno.

[Valhalla]

Originally posted by Hondamaster5505
There is no way the 400ex puts out 34hp even at the crank..

EVERY single 400ex dyno I ever saw in my lifetime, even piped, only had in the 25-27 range


theres always one person that seems to think the manufacturers are idiots. dyno's are never "dead on" they vary daily due to temp, air pressure, and humidity. not to mention that the same quad on 3 different machines will give you 3 different readings.

[Hondamaster5505]

Originally posted by Valhalla
theres always one person that seems to think the manufacturers are idiots. dyno's are never "dead on" they vary daily due to temp, air pressure, and humidity. not to mention that the same quad on 3 different machines will give you 3 different readings.

how do you explain the 400ex being only 4hp less then the yfz450:rolleyes:
If that were true, the 400ex would keep up easily stock for stock.

One thing you havent learned. Government lies.

[07trx400ex]

Well I know one thing, I would rather trust these results than the results of dyno's that I have no idea about the conditions and type of equipment. There are way too many variables when using a dyno that I would not really trust any of the results you see unless you are very knowledgable about them and know exactly what type of test is being done and what type of dyno is being used.

The ex to yfz comparo is not really fair because the yfz weighs 50lbs. less.

Ex is 410lb dry the YFZ is 350lb dry(http://www.powersportsnetwork.com/enthusiasts/new_vehicle_compare.asp?vehicle2=53944&year1=2008&mfg1=1&vehicle1=53832&go2=Go).

This translates into 9.07 pounds per horsepower for the yfz and 12.05 for the ex.

This is a substantial difference.

[07trx400ex]

.

[Valhalla]

Originally posted by Hondamaster5505
how do you explain the 400ex being only 4hp less then the yfz450:rolleyes:
If that were true, the 400ex would keep up easily stock for stock.

One thing you havent learned. Government lies.


hmmmmm. 400ex steel chassis, mostly steel motor, old heavy shocks, extremely thick old technology wheels = heavy fat pig


yzf450 aluminum EVERYTHING less unsprung weight, a few more horses and EFI for better throttle response.


hello apple, im an orange. nice to meet you.

[Hondamaster5505]

Originally posted by Valhalla
hmmmmm. 400ex steel chassis, mostly steel motor, old heavy shocks, extremely thick old technology wheels = heavy fat pig


yzf450 aluminum EVERYTHING less unsprung weight, a few more horses and EFI for better throttle response.


hello apple, im an orange. nice to meet you.

HAHAHAHAHA.

1) YFZ has a STEEL frame, not aluminum.

2) The YFZ doesnt have EFI

3) Stock 400ex shocks arent that heavy

4) The stock 400ex rims are aluminum

Learn your quads boy!

[07trx400ex]

Dude, just look at the pounds per horsepower that is a big difference, especially on a quad. All the information for the calculations are available on the links in this thread first the power which you must convert kw to hp then the weights.

Also yfz specs:http://www.yamaha-motor.com/sport/products/modelspecs/323/0/specs.aspx

[REPOMAN]

Originally posted by Hondamaster5505
HAHAHAHAHA.

1) YFZ has a STEEL frame, not aluminum.

2) The YFZ doesnt have EFI

3) Stock 400ex shocks arent that heavy

4) The stock 400ex rims are aluminum

Learn your quads boy!
x2 the only aluminum part of a yfz frame is the SUBframe. i can prove that with photos. my friend broke his in half today at the dunes. and hondamaster is right about the efi cause anyone i have seen (most of my friends ride yfz's) are carbed. you just got owned trying to be smart. hello wanna be smart guy i am repoman

[Hondamaster5505]

Originally posted by 07trx400ex
Dude, just look at the pounds per horsepower that is a big difference, especially on a quad. All the information for the calculations are available on the links in this thread first the power which you must convert kw to hp then the weights.

Also yfz specs:http://www.yamaha-motor.com/sport/products/modelspecs/323/0/specs.aspx

I didnt take that into consideration, so your right.

But as far as im concerned, Valhalla just got owned by a 14yr old!:p

[07trx400ex]

Yeah, I don't really know what we are arguing about really, I was using the website 08400ex gave to give the hp of the most popular sport quads, and It turned into an argument, I have not really tried to argue, but I just gave facts that are backed up by reputable sources.

[REPOMAN]

Originally posted by Hondamaster5505
I didnt take that into consideration, so your right.



But as far as im concerned, Valhalla just got owned by a 14yr old!:p

lmfao. i did hear that yfz450's are going efi in the future

[416exfreak]

Suzuki even stepped it up in the bike world...

The 08 RMZ450 has fuel injection.:eek2:

EDIT: if I remember correctly the 400ex has 23.1 HP stock.

Or so said the last dyno.:ermm:

[Hondamaster5505]

Originally posted by REPOMAN
lmfao. i did hear that yfz450's are going efi in the future

well I dont think he even knows that:blah:

i dont know what goes on in peoples heads sometimes.

[07trx400ex]

In the midst of this, I do not know if we ever came to an agreement on what the real hp #'s for a 400ex are.

We need to specify if we are talking about at the crank or at the wheels.

[07trx400ex]

For now, I will go with 34.2 hp at the crank, that sounds reasonable to me.

I trust the California Environmental Protection Agency(even though I have no idea of what method of testing they use, more research is needed and Calculus II test tomorrow), more than I do anybody's dyno's that obviously are biased. I do not know of any reason an environmental protection agency would try to manipulate hp #'s. So 34.2 it is for me, until better information is obtained.

[SG1]

Well I just put it this way the 400ex is a great woods bike and great for a joy rider. It can be made for many other great uses. But all in all it's the slowest of the bunch stock. So HP doesn't mean a whole lot when you are behind most bikes that are faster than you. So if you aren't into wanting to be the fastest and just love riding it's all good with a 400ex. I love my 400ex it's great for what I want which is reliability, just fast enough for me and it will go just about anywhere I want it to go. The faster bikes are more for racers and have more technology in them and somewhat more maintenance. But for a weekend warrior a 400ex is great.

[07trx400ex]

Yeah, that is EXACTLY how I feel about the 400ex and I now love mine, despite having second thoughts at one point, but the question was asked about the hp so we normally try to answer the q's the best we can.

What kind of meaningful racing happens in a straight line anyway?

[VR6INSD]

how much hp would a 440ex have?

[Hondamaster5505]

Originally posted by VR6INSD
how much hp would a 440ex have?

depends. There are lots of factors there.

anywhere from 38-46

[07trx400ex]

if I remember correctly the 400ex has 23.1 HP stock.


Or so said the last dyno.

What type of dyno was this?
(brake dyno or inertia dyno)
was it designed to test the engine or the chassis?

Was it corrected for atmospheric test conditions?

What kind of test was done?
Steady State or Sweep Test?
If a sweep test was done what type?
Fixed Load Sweep Test or Controlled Accelleration Sweep Test(active load control)?


Dyno results can be manipulated.

[07trx400ex]

Assuming the 400ex started out with 34.2hp at the crank, then(my calcualtions) show that a 400ex should have somewhere in the neighborhood of 24.8 to 26.3hp to the wheels but this is using the method for streetbikes so there is a little room for error.

This is the best answer I can come up with.

It would be greatly appreciated if someone "in the know" could chime in on this!!!

[07trx400ex]

ttt

[Hondamaster5505]

Originally posted by 07trx400ex
Assuming the 400ex started out with 34.2hp at the crank, then(my calcualtions) show that a 400ex should have somewhere in the neighborhood of 24.8 to 26.3hp to the wheels but this is using the method for streetbikes so there is a little room for error.

This is the best answer I can come up with.

It would be greatly appreciated if someone "in the know" could chime in on this!!!

Those wheel numbers sound about right!

On our wolverines title, it said it was 28hp:rolleyes: But now I realized thats at the crank.