440ex and 426ex

[TCracin440ex]

ok....im gettin some cash flow here pretty soon and im getting a bore kit, a stage 2 hotcams, 4 kenda klaws, 4 new rims, and pro design kill

what i want to kno is...what kinda bore should i get...440ex or 426ex....ive heard things about the 440ex like they dont hold up as well as the 426...and so on....i want to know what are your experiences with a 440 or a 426ex and which kit is the best for me...


i really dont want to have to send my topend out to be bored and sleeved unless i hear something bad enuff about a 426ex to make me realllly change my mind...so post away...

[04'400ex'er]

Originally posted by TCracin440ex
ok....im gettin some cash flow here pretty soon and im getting a bore kit, a stage 2 hotcams, 4 kenda klaws, 4 new rims, and pro design kill

what i want to kno is...what kinda bore should i get...440ex or 426ex....ive heard things about the 440ex like they dont hold up as well as the 426...and so on....i want to know what are your experiences with a 440 or a 426ex and which kit is the best for me...


i really dont want to have to send my topend out to be bored and sleeved unless i hear something bad enuff about a 426ex to make me realllly change my mind...so post away... I would say save that money for the 450R.

[TCracin440ex]

nah...im keeping my 400ex for my trail machine and i want some more power....and some of us dont ahve the money for a new 450r right yet...i plan on gettin a 450r...but its going to be a full blown trail machine

[Florida400EX]

426 is going to be more reliable and produce less heat, while getting similar power.

[TCracin440ex]

so ur sayin my buddy with a 440ex kit, stage 2 hotcams, stock carb, pro circuit t-4 full exhaust, rev box, rejetted, and k&n will be close to a

426ex with a stage 2 cam, stock carb, k&n filter, rev box, rejetted, and a TC exhaust cuz im ditching my t-4 slipon and gettin a TC as well

[quadmx7]

i have a 426ex built by mark baldwin and my friend/mechanic has a 440ex hi-out put kit by CT racing. both are close in power and he has had no trouble with his CT motor. my 426 revs quicker which gives me the advantage. because it revs quicker i can get the start and usualy pull him in most places. and this weekend we are going to put them on the street and see how the top ends compare. i highly recomend the 426 i love mine and we will soon find out how she does against the 450s. but keep in mind if you go witha 426 and decide u want more power for a little more money you can go to a 440.

[TCracin440ex]

thats great....now....im sticking with my first choice....426ex...


now which piston kit should i get...JE or Wisecoe


JE and the wisecoe both have 11:1 ratio's but a JE has the option of a 13:1 ratio

[quadmx7]

we have pretty much always used weisco in all our quads and dirtbikes and havnt had any trouble out of them but i have heard good things about the JE.

[TCracin440ex]

i think wiseco it is then



because the wiseco kit is 109.95 compared to 135.95 from JE

[northeast400]

I love the 426. I have heard of some rod problems with ratios above 12:1. I have a wiesco kit from RobbsRacing.

[TCracin440ex]

well my buddy has a 440ex kit with a 12.5:1 ratio and i think it will give him problems later on down the road


i was thinkin a 426ex with a 11:1 ratio wouldnt give me problems....


but how would that 426ex w/ 11:1 stand up to a 440 with the mods listed above and a 12.5:1 ratio

[TC426EX]

You should be able to beat that 440, I beat my friends 440 with the 13:1 JE setup you mentioned with my 12:1 426. It revs faster, so I got him off the jump, and he starts pulling on me in a drag when Im revving out 4th and just puttin 'er into 5th. I cant say enough good things about my 426 kit, you are definitely making the right choice. If you are going with the hotcam because of the price, go ahead, it is a great cam for the price. If you have extra loot then you might as well go with the TC 924 MX or 926 XC cam depending on your needs, they are the best cams to me and alot of others... Good luck with the build man, let us know how it goes!! Oh yeah, and as I always preach...HELI COIL your head studs or get a heavy duty stud kit or make blowing head gaskets your new hobby!!

[TCracin440ex]

now all ive got to do is find a local machine shop to do my bore and put the motor back together...i am although going to give tom a call and get a TC exhaust


i think im going to see if this place arround in my area called Kowaski racing engines will bore it out...they work on v8s and car motors but the same machine is used to bore/hone a quad cylinder a swell

[TCracin440ex]

yea ill look into the heavy duty stud kit...cuz as of right now my quad is still down...and im hating it...i want to go back to birch creek and rip it arround hte mx track so bad....after i get it fixed im going to make sure that it dont break again unless I break it...but blowing head gaskets doesnt sound like my cup of tea

[Dave400ex]

When you order the TC pipe, I would order a TC Cam also. Much better then the Hotcams all around... GNCC would be good if your making a woods machine...

[TCracin440ex]

price wise...whats the cost of the TC cam compared to the Hotcam

[04'400ex'er]

Hopefully I soon will be gettin a 450r new 4 $5599. Go JE or Ross over weisco. Also i would do a tc cam if you are gonna have other tc products over hotcams

[Dave400ex]

I paid $190 for my XC Cam. Not sure what the hotcams cost, I never looked at them, was getting a TC no matter what. lol

[TCracin440ex]

hot cams are 124.99

[TC426EX]

The TC will end up being 195 or so with your stock cam as a core... I think Cals400ex bought one last week and thats what he paid if Im not mistaken. Its around 200 bucks bottom line and worth every penny over the $120 hotcam... Its honestly better in every way shape and form...

[TCracin440ex]

imma buy that 426ex kit from moto-man.com i wonder how much tom would charge me to bore the cylinder and i can have my mechanic put the topend back togethere for me....i also might talk to mike boone about getting my stock head ported and polished...cuz i want to be able to hand my friend his arse on his 440....he gets pissed off when he looses

[Evan400ex]

T&T Racing that built my bike said to go with the 416 bore. He said 416's will tear the hell out of 440's. They have been in business for something like 25 years so I guess they know what they're talking about. When I went in there I was planning on buying the 440 but they steered me towards the 416 bore.
The 416 has been a very strong motor. It pulls hard through every gear. I've had for several months now. I have actually gotten to race a 440 with similar mods and beat him. I actually get the jump on them off the line and just keep pulling. The larger bore's actually rev slower so maybe that's why.

[QuadJunkies]

Originally posted by TCracin440ex
thats great....now....im sticking with my first choice....426ex...


now which piston kit should i get...JE or Wisecoe


JE and the wisecoe both have 11:1 ratio's but a JE has the option of a 13:1 ratio I run 11:1 Ross and have a 426 and have been very pleased with it....;)

[TCracin440ex]

i think im going to stick with the 426ex kit, stage 2 cam from TC (if money permits) if not its hotcams stage 2, TC exhaust, and ported and polished


she will be running like a raped ape,
and im gettin kenda klaws all the way arround and douglas wheels all the way arround as well....

so running strong and looking good

once i get that stuff done to the ex im done....im hooking up my truck, by then ill be done graduated and my rents will give me some money for graduation and ill be able to buy and hook up a 450r

[QuadJunkies]

[QUOTE]Originally posted by TCracin440ex
[B]i
she will be running like a raped ape,

once i get that stuff done to the ex im done.... /B][/QUOTE) Sure..........................thats what we ALL say..............:D :o :p

It never stops.........lol

[Florida400EX]

If you want to go with a hotcam, send me a PM, I'll hook you up.

[TCracin440ex]

yea i tell every 1 i put my money into my bank and they are like your bank??? im like yep...its called a honda 400ex

[nakomis0]

I think you should go with the 426 like ya want too.

but, a 440 is gonna go faster than a 426. It ussually is about a 1-3 hp difference.

"T&T Racing that built my bike said to go with the 416 bore. He said 416's will tear the hell out of 440's. " ... whats next a 416ex with tear the hell out of a 505ex?:confused: Just pickin, but ya see the idea.....

I heard the JE pistons are a little lighter than Weisco. Which IMO helps alot. Any mass you can take off that motor either the piston, wrist pin, flywheel, ect... makes a difference you can ussually feel. It doesnt really add HP, but will add your torque.

[TCracin440ex]

yea but hes also running a 12.5:1 ratio if i get the 11:1 it will be better because i have less likely hood of breaking a rod


hes running a k&n filter, pro circuit full system, rev box, stage 2 hotcams, and a 440ex kit with stock sprocket ratio, stock rejetted carb and 18s on the rear


ill be running a 426ex with a ported and polished head TC cam, TC exhaust, 18's on the rear, k&n filter, stock but rejetted carb, rev box, and a stock sprocket ratio

i think ill have the upper hand on the bottom end in which i think ill be able to get him out the hole


i dunno if a 416ex will beat a 440 then im pretty sure a 426 will

[TC426EX]

Youll waqnt to change your gear ratio when running that 426 kit w/18 " tires. Youll want to keep the 15T front and go down to a 37 or 36 in the rear, then you should really pull him...

[QuadJunkies]

I pretty much agree with everything he just said^^^^^^I need to change my gearing.. I love the one tooth dropped in the front off the line, but I rev out WAAAAAyyy too fast,this should help me from having to get a Rev box for a bit hopefully. The torgue is awesome....Ive pulled quite a few big dogs on the track with mine but the top end I cant stay ahead with all these new quads.........:(

[Chanman420q]

there is SUCH a SMALL power diffrance between the 416 and the 426 to just go wit hthe 416. it saves you, who knows if your engine goes u can bore it again with the 416, the 426, u HAVE to resleeve it. and the 426 will rev a little slower and make a little more heat. so honestly id think the 416 would be making more power

[QuadJunkies]

Originally posted by Chanman420q
there is SUCH a SMALL power diffrance between the 416 and the 426 to just go wit hthe 416. it saves you, who knows if your engine goes u can bore it again with the 416, the 426, u HAVE to resleeve it. and the 426 will rev a little slower and make a little more heat. so honestly id think the 416 would be making more power I didnt resleeve mine?????Nor did I use Hardened Rockers,Hetricks said I wouldnt need them and Its been 6 months and its running strong....:huh Ive honestly never ran a 416, but Ive race againt 426 and 440's......Ive heard the 416 has great torque and Ive only seen one 440 run really good

[UglyMotha™]

no resleeving required for the 426 but it does take the stock sleeve over bout .006" farther than is recomended for an overbore

[yellerfour00]

My wiscoe 440 kit is great it smokes yfz 450 out of the hole up to uper toend and they just hardly pull away tons or powers through out the whole quad i really like it and havent had any problem and i have the hot cam stage 2 with big gun exhuast..

[TCracin440ex]

ok bottom line...no ifs ands or buts about it....im gettin me a 426ex kit


a local racing shop here does boring for 35 dollars a cylinder, and they do P/P really cheap too

[Chanman420q]

when i said with the 426 u have to resleeve, what i ment was, if u blow the top end, u cant bore it again. 426 is the last bore on the OEM sleeve. so be smart and do the 416, i dont see a reason to go 426 when its less reliable, revs slower and makes more heat. do whjat u want, ur engine, but the 416 is better. and theres room for error

[TC426EX]

Originally posted by Chanman420q
when i said with the 426 u have to resleeve, what i ment was, if u blow the top end, u cant bore it again. 426 is the last bore on the OEM sleeve. so be smart and do the 416, i dont see a reason to go 426 when its less reliable, revs slower and makes more heat. do whjat u want, ur engine, but the 416 is better. and theres room for error

Totally disagree... I had a choice to do either of the 3 bores (416, 426, or 440) when I gave my motor to TC and he reccomended hands down the 426. He said it is the ideal bore for that bike and produces the best power output. Mine revs quick as hell... I know the lightened flywheel helps but for real, I dont have any major heat problems, and it is a VERY reliable bore... The 440 is the so-called "largest reliable bore size" and the 426 is even below that, so youre cool. I would want the best reliable performance out of my motor, and the 426 is it. I am not down with this whole "save yourself a bore" theory. I understand where youre coming from but you shouldnt have any more problems with a 426 than a 416 that is for sure. If I DID blow up my 426 I would see about getting a new stock sleeve installed and keep that bore size that is how much I like it... We're arguing apples and oranges here... You have a 416 and you love it , and I have a 426 and love it. Bottom line is that he is NOT gonna have any noticeably slower revs with it, and he shouldnt have any reliability issues with it either since that bore size is reliable as a rock...

[TCracin440ex]

damn TC get umm....

[quadmx7]

just let the man get the 426 like he wants. i love mine and im sure he'll love his. if thats what he wants dont try and talk him out of it. and like TC426EX, the 426's rev quick as hell and i have had no heat problems out of mine. but TCracin440, if u ever get the money i sugest a bigger carb, it made a nice differnce in my 426. i worked extra hours a week to pay for my FCR it and it was worth it

[TCracin440ex]

yea if imma get any carb its going to be a 39mm but if stock carb powers it just fine then ill keep the stock rejetted carb for a while

[Chanman420q]

im not trying to convince him, i dont care what he rides, its his bike, he can figure out how to put a friggin xr100 cylender on his 400 for all i care. i was just trying to give him facts and help him make the right disision, so later on if his 426 blows and he has to pay 200 dollars to get it resleeved, we dont hear, how come no one told me it was the last bore. thats all. no flaming intended. just opionions. it just seems to make more sence to go 416 than anything else. atleast in my eyes

[TC426EX]

I respect your opinion chanman, I wasnt trying to flame you or anything bro...

[QuadJunkies]

Originally posted by Chanman420q
im not trying to convince him, i dont care what he rides, its his bike, he can figure out how to put a friggin xr100 cylender on his 400 for all i care. i was just trying to give him facts and help him make the right disision, so later on if his 426 blows and he has to pay 200 dollars to get it resleeved, we dont hear, how come no one told me it was the last bore. thats all. no flaming intended. just opionions. it just seems to make more sence to go 416 than anything else. atleast in my eyes :huh are you having a tough day??????

Just take DEEP cleansing breaths and count to 10...lol.....:p ;)
Just trying to lighten things up a bit.......;)


I know of two other EX's that are a 440 and a 426 and its been a few years since they had there work done and so far BOTH have been problem free....The 440 you ca ntell now it due for a rebuild since its been raced a ton but the people who done there work also done mine....Im sure alot also would have to do with how well the work was done to it and how good the maintence is also.......

[TCracin440ex]

yep i agree QJ...i keep my 400ex very well maintained....i change the oil, oil filter, spark plug, and clean the k&n about every 2 good trips to the mx track or every 2 good rides

[400EXcrazy]

i wouldnt get a hotcam stage 2 if its goin to be a trail quad cuz mines a 416 with stage 2 hotcam and on the tight trails u really gotta stay on the gas

[Quadzilla]

I say Stage 1 or something along those lines (Web Wood Cam, etc). I have a Stage 2 also and lost some low end. On the top end, she wants to rev forever and ever and ever.

[UglyMotha™]

Originally posted by 400EXcrazy
u really gotta stay on the gas



you mean there's a different way to ride :huh :confused:

I have a hot came stage2 and still have tons of low end and you can bog that sob down and it will pull like a mofo.

it is a 463 stroker
hotcam stage 2
light porting
13.5-1 piston
full HMF pipe

I know at FDO which is were I used to get my motor work done they could get 47 hp out of a 426 and 48hp out of a 440. those are fully built motors but just shows you there is little difference in power between them!

[northeast400]

Web Cams rock!! I would look at those.

[TCracin440ex]

ok....about the TC cam because thats going to me my weapon of choice....do they use stock rockers, valves, and so on...cuz i dont want to ahve to replace all that chit

[cals400ex]

yes, the TC cams are drop in and you won't need to replace any of that stuff.

[TC426EX]

Yeah, TC cams are drop in and are the best....

[Dave400ex]

Yep the TC cam should just drop right in. I went ahead and replaced my valve springs and rockers with just new factory Honda just to make sure.

[Chanman420q]

i had the TC 926 and switched over to the hot cam stage 2 and well i like the stage 2, but my track isnt that tight either

[TCracin440ex]

ok 1 of my buddies from NC is sayin his 416ex will beat a 440 and a 426ex....i dont kno if i should pull my bs meter out or not...i dont quite believe it...

[TC426EX]

Dont have second thoughts, go 426...

[TCracin440ex]

i aint havin second thoughts....i just dont believe a small arse 416ex will handle a 440 like hes talkin about...i believe a 426ex will have some troube if only thing was done to it is bored and a cam...

but mines going to be

bored
ported & polished
TC cam
TC exhaust


id like to ditch the 11:1 ratio piston and get a 12:1 ratio piston

but the only thing the wiseco comes with is a 11:1

[Dave400ex]

Can't you get the JE piston instead?

[Greg Z]

To tell you the truth man 416 426 there isnt any difference

416 revs faster and has more torque

426 revs a bit slower, probably has .1 hp over then the 416

just look at it

your saying a 426 can beat a 440

OK thats like 14 CC difference......
416 and 426 10 cc difference....... Lets see hmm hmm

they will not be a big difference at all

and 416 has more room for error so you dont have to get a 440 and then blow the motor again

416 is my choice

[cals400ex]

i would say a 416 is NOT faster than a 440. however, most 440's are not built really strong and only run low compression with a non-aggressive cam. so, depending on how you build it, a stock bore piston may be quicker than a 440. also, many of the 440's are only around 435cc's. if 2 bikes were built, one being a 440 and the other being a 416, the 440 should have an edge. it would only make sense that the 440 would have more power down low. yes, the piston is heavier though.

[TCracin440ex]

je pistons dont have a 12:1 ratio..all they got is 10:1, 11:1 and 13:1