how fast

[Honda#4]

i was wondering how fast a 03 400ex with a 35.5 stock carb

[400exrider707]

:huh

[xc_racer1]

top speed is about 63mph
if u pipe it and jet it to a 165 (thats for the hmf slip on) it will probably be about 66-67

[UglyMotha™]

It faster than a 05 400ex with a 35.5 stock carb




duuuuuuuuuur :huh

[Honda#4]

r u sure because it only goes 50.5 mph for me, i dont know whats wrong but i thought they go faster than that:ermm:

[400exrider5]

Originally posted by Honda#4
r u sure because it only goes 50.5 mph for me, i dont know whats wrong but i thought they go faster than that:ermm:

are you sure you have a 400ex and not a 300ex

[400exstud]

Check the gearing because my friend had a blaster that went faster than that! That's just said:ermm:

[midnight]

I used a GPS on my 06 400ex and it does about 66, 67 stock

[Honda#4]

yea i checked it out i have a 400ex its got the two lights in front and i counted every tooth on each sprocket it is stock 15 / 38 i used a gps thats how i knew it went that fast i think them 35.5 carbs r junk or maybe the carb is pluged or something, so im getting kind of mad because i thought it went faster i'll see what u guys have to say.

[400exrider5]

are u shure the gps is correct maby try haveing a friend drive a car along side and see what his speedomiter says. also are your tires smaller it will change the gearing.

[hondajoe05]

umm ya 50mph on 05 400ex would have to be wrong mine did 67 68 on highway and maybe 73 or so downhill:D so theirs something thats gotta be wrong their

[Honda#4]

if this matters my tires r kind of bald but not that much, i dont really have anybody that would follow me with a car, would being on blacktop help with traction or not. maybe my gps's bateries r going down or something and no my tires airnt small their stock

[400exstud]

Bald tires would probably make it go faster on top end. Bald tires= less weight, less weight = more speed.

Does it run right if it is lugging in low RPM and you just punch it to wide open? If not then your jetting may be to blame. If that is not the case.........then you may be on your own.

[brian-250]

Originally posted by 400exstud
Bald tires would probably make it go faster on top end. Bald tires= less weight, less weight = more speed.




:huh

[400exrider5]

400exstud what are u talking about bald tires wont make the atv that much lighter you would not even be able to tell much difference in weight whether they where brand new or not. get your facks strait. and honda#4 when you hit fith gear do you bring your rpms up all the way because if you do and you say you have stock gearing and stock tires you must be atleast doing 60+ MPH.

[Jersey450R]

http://home.earthlink.net/~gellett/400ex.htm

All questions...GO THERE!

prove it everytime! ;)

[400exrider5]

THATS AN AWSOME SPEED CALCULATOR!

[Honda#4]

i dont totally pin it all the way maybe thats it or something i run a little or 3/4 throttle just so nothing goes caput. maybe it's just the gps i think because when u go it takes a little bit to get started. one more thing whats the stock rpm's supose to be.

[44oEX]

I did 92mph... it's on a EX..but not stock lol ....you should be getting 65

[400exrider707]

Originally posted by Jersey450R
http://home.earthlink.net/~gellett/400ex.htm

All questions...GO THERE!

prove it everytime! ;)

Also dont forget the speed calculator is only theoretical, it doesn't include air drag, and friction drag from the tires! It also doesn't include crappy jetting:blah:

[44oEX]

well not really....if you can hit the RPM the air and what ever won't efect anything...as long as you can hit the RPM you say you can hit

I got 72 hauling past one of thoes police radars that sit on the side of the road...... it was after a dounhill.

[dunes_rider]

68.62 mile hmm.. in km how will speed is??

[44oEX]

110.677km/h

[dunes_rider]

when my ex stock and i have gps , i got 106-107

i will see now with sparks and cdi:)

[44oEX]

yeah that sounds about right..for stock

[Honda#4]

and one more thing i thought of my tires do have green slime in them would that make a difference in speed.

[400exc]

it shouldnt make a difference in speed, the green slime is probably for to keep the tires sealed, and my ex went 72 yesterday clocked by a car beside me, only an air filter on it, nothin else

[Honda#4]

i just cant figure it out why my 400 goes so slow. i think for the $6500 i have i would buy a better bigger motor and a new carb as well.

[TURBO-530R]

Originally posted by 44oEX
well not really....if you can hit the RPM the air and what ever won't efect anything...as long as you can hit the RPM you say you can hit

wind drag does efect it. my 450r went 106.67 mph on dyno but I only can grt 96mph in the 1/4 mile and 93 mph in the 1/8 mile so there is yout wind /drag factor.

[44oEX]

yes wind drag thos effect the speed...but, if you look at the site that jersey450R posted...you have to put the RPM your running at to find out your top speed....that top RPM would be in real life not on a dyno....so lets say your going down the road at 8000RPM, well if you put that in, it will give you your exact speed...the wind will slow you down and you just won't rev out as high....on the dyno it you can hit say 10000...and on the road with the wind you can only hit maybe 9500 well the speed won't be as fast..but it's still right with the RPM's

[darkstar]

........................

[Honda#4]

still no luck got to 51.9 tonight still trying to get it to 65 but failing really bad.

[Plante400]

that sucks haha
my 440 will do 74 to the Bar. 3 times in a row down a long road. a guy on an enduro was beside me..
fmf PC4 and a 11.1 wiseco 440 kit

[Honda#4]

i dont know i can have the same atv as everyone on here and mines the slowest piece of crap on here i think i would trade it for a 450r. i put new batteries in my gps and im gonna try going down the highway one more time to see if that matters putting news batts in or not.

[phildogg]

what kind of gps do you have? I have a garmin E-TRex and it messes up alot. my speeds calculated will change with the differant location on the quad. something messes with it on my quads at times might be something like that. mine has been dropped alot though. used it for testing rc car speeds and went through alot of wrecks LOL...
phil

[440racer66]

i did 85 on mine my friends will do bout 70 and it only got a jet kit and exaust

[Honda#4]

i have a garmin etrex gps

[Honda#4]

i dont know if this helped but i tightened my throttle free play up i think it helped so tonight if i get a chance im going on the road and trying it if it reads the same then i know it's my gps.

[Honda#4]

i finally got it up to 60mph tonight maybe it was the throttle or something i dont know.