How to know if it really is a 440cc motor?

[Clutch450]

I just traded my old quad for an '01 400ex. The previous owner told me that it is a 440 big bore. I used to have a yfz450 and this 440ex is snappy but not like my 450. I have never ridden a 400ex before so i have nothing to compare it to. But is there anything I could look for on the cylinder to tell if it is a 440. Anything without having to take the head off?

[TRXRacer1]

Nope.

[4reeds]

Might be able to check the jetting.

[honda400ex2003]

you could possibly measure the volume displaced in the chamber. it would probably be pretty hard though since the plug hole is way down in there. steve

[TRXRacer1]

Originally posted by 4reeds
Might be able to check the jetting. That won't work either.

[a4guy]

You could always fill it up with sand or water and keep track of how much you put in then just start it up and let it blow out of the exhaust. Hahaha Just kidding.

The only way you are going to be able to tell is to pull it apart and take a look.

[MO-EX-RIDER]

race a stock bike or one with a 416 kit:muscle:

[4reeds]

Originally posted by TRXRacer1
That won't work either. Might not be a perfect method,but it will determine whether it is a stock bike or not.Jetting for a 440 will be quite abit different than a stock 400.

[TRXRacer1]

Originally posted by 4reeds
Might not be a perfect method,but it will determine whether it is a stock bike or not.Jetting for a 440 will be quite abit different than a stock 400. Nope. Actually increased velocity from larger cc's can lower the size of jets. It's not commonly seen because what we mainly do is reduce restriction and that does require bigger jetting. 40cc's will not be seen in jetting.

[4reeds]

If you had a 400ex and put a 440 big bore kit in it, would you lower the jet sizes or go the opposite way?Im betting you wouldn't even think about dropping sizes. All im saying is if its not stock jetting,it will atleast eliminate one possibility.

[JOHNDOE83]

Yeah, but ive seen 416s need 170s to 205s for main jets, so going by the jetting will not work.

If you really wanted to know you could possibly measure the piston, but youd have to take the motor all apart just to do it.

[trailrider894]

well, a 440ex isn't gonna be anything like a 450r anyway... lol I have a 400ex and a 450r but the 450r is way faster than my buddys 440ex.

he must no how to ride the 440 or its not set up right. lol a good 440 will out run a stock 450 all day long.

[4reeds]

Originally posted by JOHNDOE83
Yeah, but ive seen 416s need 170s to 205s for main jets, so going by the jetting will not work.

If you really wanted to know you could possibly measure the piston, but youd have to take the motor all apart just to do it. you wont put a 205 in a stock carb for a 416.And by the way you just confirmed what i said. You've seen 416's with need 170 and up.So if it is "stock jetting" it wont be a 440.If its not,you eliminated that possibility.

[440ex. ehhh!!]

Originally posted by trailrider894
well, a 440ex isn't gonna be anything like a 450r anyway... lol I have a 400ex and a 450r but the 450r is way faster than my buddys 440ex.

yea, then he doesn't know how to ride, i race flat track against 450r's and raptors and i usually beet em. last friday came first place in finals, ahead of 700 raptors, dvx 400, trx 450r, 400ex, trx 250r/w +4mm crank.

so that says it all, 440's are much faster then people think.

im glad to see that the 440 guys are strpping up and saying some thing. stock 450 arnt all that. yes there nice .

[440ex. ehhh!!]

haha yea ehh.
and this is still only my first season racing. buddies got a yfz450r thats lowered, widened and all done up for flattrack, he raced for 3 years, this season he convinced me to try it out and first night out, he beat me in 2 of the 4 heats.

And not to mention, the trx450s are probably the most common quads that show up at the track and there is only one that is even close to me on my 440, and he has raced for a few years at that track and its lwered aand widened.

so i think the 450 speaks for itself. haha,

and btw, im way up on these 450's and i have stock cam, big bore is only thing done to my engine.

[sc400ex_rider]

ONLY WAY TO TELL IS TO MEASURE THE PISTON DIAMETER. ALSO STOCK 04-05 450r HAVE A 118 main jet. they are Detuned from the factory.

[JOHNDOE83]

Originally posted by 4reeds
you wont put a 205 in a stock carb for a 416.And by the way you just confirmed what i said. You've seen 416's with need 170 and up.So if it is "stock jetting" it wont be a 440.If its not,you eliminated that possibility.

Some people are idiots, and build big bores without jetting, sometimes they sell there quad cause they think it isnt running right, or they messed up the build, some people throw away atvs because they think it will never run again.

Thats when I come along and pick it up off the side of the road and clean the carb and have a new atv...lol.

They coulda bought a dyno jet kit and put it in the stock bike and to sell it said it had a 440, theres all sorts of possibilites, you cant know by the jetting, they coulda had no idea what they were doing.

Theres no way to tell unless you pull it apart and measure the piston.

[Pt's400ex]

I agree with Johndoe just take it apart and look at the numbers on the piston it will tell you the size and what kind of piston i'm sure. While you are in there check your cam, cam chain, tensioner, valves and so on, so you will know what you have and it's condition. I would go through the carb as well and check your pilot, main and needle position and then give it a good cleaning. Trust me the more you know about the bike the better off you will be and feel. Jim

[buck440]

Originally posted by ericcrip
he must no how to ride the 440 or its not set up right. lol a good 440 will out run a stock 450 all day long.

lol i miss the 400ex section :D good stuff in here

[trailrider894]

ha ha... i never said my 450 was stock now did i.... lol and yeah he is a pretty crappy rider. I was just wasn't as impressed with the power out of his 440ex.

[f4iracer]

440's won't hang with 450's. I've seen it all day long. The 440 isn't even that much faster than the 416 or 426.

450's will spank.

also, the jetting will give youa good idea. Given you altitude and aftermarket setup you should get a good idea as to what size mainjet you would need to run a 440 setup on the stock carb.

Nobody is running a 220 or whatever the guy said, haha they dont' even make that size jet for this carb.

If the quad isn't running right then your jets aren't gonna hlep you at all, however if it's running good right now and you want to see what jets are in it to see if it's tuned for the 440 it should give you a good idea.

[TRXRacer1]

Originally posted by f4iracer
440's won't hang with 450's. I've seen it all day long. The 440 isn't even that much faster than the 416 or 426.

450's will spank.

also, the jetting will give youa good idea. Given you altitude and aftermarket setup you should get a good idea as to what size mainjet you would need to run a 440 setup on the stock carb.

Nobody is running a 220 or whatever the guy said, haha they dont' even make that size jet for this carb.

If the quad isn't running right then your jets aren't gonna hlep you at all, however if it's running good right now and you want to see what jets are in it to see if it's tuned for the 440 it should give you a good idea. 1) Depends on what has been done to what machine but a properly (not even heavily) built 440 will pull piped 450's.

2)They make up to a 230 main for this carb.

3)Count yourself another person that has a misunderstanding as to the ability of determining cc's from jetting. Not gonna happen.

[JOHNDOE83]

Originally posted by f4iracer
440's won't hang with 450's. I've seen it all day long. The 440 isn't even that much faster than the 416 or 426.

450's will spank.

also, the jetting will give youa good idea. Given you altitude and aftermarket setup you should get a good idea as to what size mainjet you would need to run a 440 setup on the stock carb.

Nobody is running a 220 or whatever the guy said, haha they dont' even make that size jet for this carb.

If the quad isn't running right then your jets aren't gonna hlep you at all, however if it's running good right now and you want to see what jets are in it to see if it's tuned for the 440 it should give you a good idea.

Actually I run a 220 in my 440 with a stock carb and it is jetted proper.

My 440 will do 70mph in 4th gear alone, and will most certainly hang with 450s all day long, ericcrip has video of him beating 450s and raptor 700s just a few threads down, they are not stock, they have pipes, cams, jetting and small bores.

[TRXRacer1]

Originally posted by JOHNDOE83
Actually I run a 220 in my 440 with a stock carb and it is jetted proper. Your sig says different, you're using a a much larger carb. Your jetting should be higher.

[Honda4life05]

my bud has a freshly built 440ex with stock cam and a sparks pipe, airbox removed. My 450r with just a pipe will beat by about 2 quad lengths. we are about equal riders

[TRXRacer1]

Originally posted by Honda4life05
my bud has a freshly built 440ex with stock cam and a sparks pipe, airbox removed. My 450r with just a pipe will beat by about 2 quad lengths. we are about equal riders So what you're saying is your buddy didn't realize a 440 without the proper accompanying mods is pointless until you showed him up.