Curious to know what i'm running... 400ex 440ex

[BasSTiD]

Hey guys i got a 400ex Pretty stock engine-wise but i do got a full yoshi exhaust and a k/n air filter jetted perfect. I was wondering what that would be... but my quads in the shop now gettin a 440 kit so i would like to know what it'd have then too. Thanks guys..

[cr977]

stock i beilieve is somewhere around 27hp, with yosh and k&n probly 30 or 32, with 440 yosh k&n probly no more than 36, but, if you are putting a 440 kit on it you are probably getting new valves, springs, rockers, and cam, and higher compression too, that is the right way to do it. if you do it the right way with yosh and k&n probly 38-42 depending on octane and anything else that may get done to the bike while in the shop keep in mind a new top end provides way more power than say what it will after 20-30 hours. this is not personal experience what i have read is waht i am posting.

[BasSTiD]

thanks man... much appreciated.

[416exfreak]

Stock 400ex's put out 23 HP.

With a full Yoshi and a filter, I'd say you had somewhere around 27-28 HP.

With a 440 kit, it depends on your cam, port work, compression etc.

You could wind up with anywhere from 32-45+ HP. I dont see any 440 making more than 48-49 HP though.

;)

[XXXRACER165]

Mine puts out about 42-43 with everything.

[Ruby Soho]

Originally posted by 416exfreak
Stock 400ex's put out 23 HP.

With a full Yoshi and a filter, I'd say you had somewhere around 27-28 HP.

With a 440 kit, it depends on your cam, port work, compression etc.

You could wind up with anywhere from 32-45+ HP. I dont see any 440 making more than 48-49 HP though.

;)

stock 400ex's put out 27.

a pipe and filter i doubt would give you 5 horsepower.

i have yet to see proof of a 440 making over 45hp. 42 is the most i've ever seen

anyways, if your getting the 440 you should be getting a cam and if so you should end up in the mid or upper 30's.

[XXXRACER165]

Originally posted by Ruby Soho
stock 400ex's put out 27.

a pipe and filter i doubt would give you 5 horsepower.

i have yet to see proof of a 440 making over 45hp. 42 is the most i've ever seen

anyways, if your getting the 440 you should be getting a cam and if so you should end up in the mid or upper 30's.

My pipe gives my 440 more than 5 horses, now since I made it shorter I dyno'd it it's making 45-46 horse power.

[250r4life]

my flux capacitor gives me 27 hp all by itself!!!

[pro-rider46]

i saw the one post said ,"depending on what octane your running" do you know what octane is, octanes are just protection from self igniting itself from compression, diesels have no plugs, and 42 octane, and about 17-18:1 compression, and they self explode the fuel mixture, just some food for thought.

but back to the original question... it depends on the cam(mainly), Porting, jetting(obviously), air filter(believe it or not) and a few other odds and ends... also some fuels make more hp than others, but not because of octane. haha

[416exfreak]

Originally posted by Ruby Soho
stock 400ex's put out 27.

a pipe and filter i doubt would give you 5 horsepower.

i have yet to see proof of a 440 making over 45hp. 42 is the most i've ever seen

anyways, if your getting the 440 you should be getting a cam and if so you should end up in the mid or upper 30's.

My Yoshimura gave me a full 7HP. I ditched the airbox lid (regret it now) and installed a K&N, thats worth probably 4 alone.

I wouldnt doubt that my 440 is around 45 horses.:chinese:

[trx400EXtreme]

i wanna say that i'm around 33-35 horses with my 400. it's just piped, jetted, and filtered with no lid.

[Baracudaaa]

Originally posted by 416exfreak
My Yoshimura gave me a full 7HP. I ditched the airbox lid (regret it now) and installed a K&N, thats worth probably 4 alone.

I wouldnt doubt that my 440 is around 45 horses.:chinese:

Hahahahaaa, 11 HP from a pipe and K&N filter alone, NOT A CHANCE!!!!!!

[8686]

You guys are all hilarious! "I wanna say mine is around....." "I'd say mine makes about......" If you haven't actually put yours on a dyno then you have no freakin idea what kind of hp it makes. No two bikes are the same and you're almost always not making as much as you think.

[witech]

With the 440 kit I would add 2 hp. Around 1hp per 20cc is about right.
Now port the head and do cam mods and the numbers will be much higher.




DirtWheels: March '01
These are just slip on silencers.
Brand Peak HP Cost
Honda (Stock) 26.9 $188
Big Gun 27.2 $300
Big Gun (quiet) 26.3 $340
CT Racing 27.9 $299
FMF Power Core 26.7 $270
Graydon 27.1 $295
Pro Circuit T-4 27.4 $250
Stroker SX1 26.9 $235
White Brothers E-ser 27.9 $260
White Brothers R4 27.1 $245
Yoshimura RS-3 27.6 $338


ATV Sport: June '01
These are full exhaust. No prices given.
Brand Peak HP
Honda (Stock) 25.9
DMC (Advan. Perf.) 27.3
Arrow 26.6
Big Gun 25.7
Curtis Sparks 27.8
DG 25.7
Duncan Racing 27.3
FMF Power Core 26.6
HMF 26.4
LRD 26.3
Powroll 26.4
Pro Circuit T-4 26.1
Ritter Cycle 26.6
SuperTrapp 26.3
TC Racing 25.9
Trinity Racing 26.8
White Brothers E-ser 27.6
Yoshimura RS-3 26.7

[BigBore24]

i wanna say my "foot" is about 15 inches, but ive never measured
:D

[fast2007]

XXX racer you gotta quit that 45-46hp...LOL Yours is slower than myne in 660ft (time/mph) and myne dont make that 45hp...4mph slower and u think 46...LOL WHAT A JOKE!!

[RATPACK Z400]

The ex with 440 realisticly is putting 33-35 hp they had a review with the Z and the ex with 440s and the Z was smoking the ex and the Z couldn,t have been a little more than 40hp .stock ex 25-27hps.