how much horsepowes does a 400ex have?

[MoToX199]

i was wondering if any body knows how much power a 400ex has when stock? thnx

[muddy400EX]

i found this on atvconnection.com


28.5 HP
23.2 ft. lbs of torque

they said they gained 2 horses after removing the air box lid

[rooster_20]

24.4hp

[6858-400ex]

Originally posted by rooster_20
24.4hp

i would say abot 27-28 hp i think 24.4 is a little low

[gojk]

Mine is around 34hp with all the stickers and whatnot.

I think a stock 400ex is around 27-28. I have seen peoples dynos range from 22-33 on a stock 400, so I guess it is all on who dynos them.

[chigger]

It depends on the dyno and the conditions. So the only accurate way to compare them is to run other quads with them.


I dont remember where I got these numbers for sure, but they will give you the idea of what I mean. I believe they were on the same dyno.

1. Suzuki Quadzilla LT500 ---------> 51srwhp / 390lbs = 0.1308 horsepower per pound
2. Cannondale Cannibal -------------> 38srwhp / 375lbs = 0.1013 horsepower per pound
3. Yamaha Banshee ------------------> 37srwhp / 386lbs = 0.0959 horsepower per pound
4. Suzuki QuadRacer 250R --------> 31srwhp / 327lbs = 0.0948 horsepower per pound
5. Kawasaki Tecate 4 ----------------> 33srwhp / 339lbs = 0.0944 horsepower per pound
6. Honda 250R --------------------------> 31srwhp / 329lbs = 0.0942 horsepower per pound
7. Yamaha Raptor 660R -------------> 35srwhp / 399lbs = 0.0877 horsepower per pound
8. Suzuki Z400 / Kawasaki X400 -> 32srwhp / 370lbs = 0.0865 horsepower per pound
9. Bombardier DS650 BAJA --------> 39srwhp / 475lbs = 0.0821 horsepower per pound
10. Honda 400EX -----------------------> 29srwhp / 374lbs = 0.0775 horsepower per pound
11. Polaris Sport 400 ------------------> 34srwhp / 481lbs = 0.0707 horsepower per pound
12. Polaris Scrambler 500 2WD ---> 35srwhp / 523lbs = 0.0669 horsepower per pound
13. Yamaha Blaster --------------------> 20srwhp / 320lbs = 0.0625 horsepower per pound
14. Yamaha Warrior -------------------> 21srwhp / 397lbs = 0.0529 horsepower per pound
15. Honda 300EX -----------------------> 17srwhp / 377lbs = 0.0451 horsepower per pound
16. Kawasaki Mojave -----------------> 17srwhp / 379lbs = 0.0449 horsepower per pound
17. Honda 250X -------------------------> 15srwhp / 351lbs = 0.0427 horsepower per pound
18. Honda 250EX -----------------------> 13srwhp / 349lbs = 0.0372 horsepower per pound
19. Suzuki QuadSport 230 ----------> 11srwhp / 309lbs = 0.0356 horsepower per pound
20. Wal-Mart PowerWheels ---------> 0.5srwhp / 50lbs = 0.0100 horsepower per pound

2001 Dodge Viper RT/10-------------------> 450 bhp @ 5200 rpm/3460 lbs = 0.13005 hp per lbs
Ford Mustang SVT Cobra...240 bhp @ 4800 rpm/3354 lbs= 0.07155 hp per pound

I added the last few just for giggles.

[Joe400ex]

with my mods how much hp do u think i have

[gojk]

Originally posted by Joe400ex
with my mods how much hp do u think i have

If jetted correctly, maybe 30.

[Joe400ex]

damn i thought i would have more thats ok a 416 and a stage 2 cam should be good but give me a couple of months to get some money together

[SHARPMACHINE]

I like the dyno index it is cool and very informative, gotta get one of those power wheels, the one I had when I was a kid dynoed at .993 srwhp and only weighed 28 lbs, that is .0355 horsepower per pound meaning it was a close race with a quad sport.