416/426/440 pros/cons?

[HondaChris]

What are the benefits/disadvantages of each? I hear A TON of people say to just go to a 416 instead of a 426, and another TON saying just go straight to the 440 and forget everything else. How do each of them do on dependability and act power-wise?

[sportraxkid]

never rode a 426 but I have rode a 416 and I can tell you this the 416 does rev a little quicker but doesnt have the torque of a 440.But the rev box is a must with a 440 in my opionon It made a noticable difference. If you ride in the sand you should go with the 440. I can beat plenty of raptors and z's with mine. I have only raced a couple 450's and I beat some, lose some, but it it still hangs with them. As far as reliability goes I would go with the 11.1 compression and u can run pump gas I have only about 20 hours on mine but my dads friend has had his in for 4 years and goes to the dunes with us about everyother weekend and has had only one problem and that was a 1 headgasket. But if your worried about that just get some bigger headstuds and a good gasket. I also installed the hotcam stage 2 at the same time and that probley made a big difference. Also I paid $200 for a wiseco 440 11.1 compression piston, Hotcam stage 2, LA sleeve, rings, and all the gaskets and seals off ebay. And I paid 120 for lyndsey machine to sleeve and bore it. It also hasnt burnt a drop of oil :D
Next im porting my head and buying a carb.

[sportraxkid]

oh and people say 440's allways overheat thats a bunch of crap I went on a 2hr non stop ride through the dunes on mine when it was atleast 95 degrees.

[beerock]

best setup ive heard about that beats 440's is a 416/426 stroked to 440. the reason being, the smaller piston revs faster etc.

[TC426EX]

I say do a 426 man... The reason some people complain about the 426 is because it is the last bore you can do on the stock sleeve, but who cares??? Do you really think you have the need to "save yourself one more bore" by going with the 416? The chances of you ruining a 426 to have to need a re bore to the next size are pretty small so thats just my opinion. And even in that case you can either go up to a 440 or you can just have a new 426 size or stock sleeve installed. I find the 426 to be the perfect size bore, and I hope to add a stroker crank soon to make it 450cc displacement... I would do a 416 or a 426 over a 440 any day of the week though...

[416exduner]

Depends on the type of riding your going to do, if you just want to haul then for sure go with the 440, it'll give you all around power like a Raptor. But if you're looking to get off the line fast and do some drag racing or mx style where you need to rev faster coming out of corners then you should go with a 416/or 426 set up. The 416 is probably the best to go with, that way if you have any problems in the future you have one more bore on the stock sleeve. After that bore you have to go with a new sleeve which just gets more and more expensive to have done. I have a 416 and I ride in the dunes, I can hang with Banshees with pipes in a flat drag....but I also have a cam and a pipe and a filter.

[K_Fulk]

Originally posted by pickle965
Couldn't the sleeve be nikasil coated to help with heat issues?

Nickasil wont keep it any cooler. But it will make the bore last a lot longer.

If you could get an aluminum 440 sleeve and have that nickasiled. It would run quite a bit cooler since iron is a better insalator than aluminum.

But good luck, for some reason no one seems to make them. You would have to get one made custom.

As long as you keep the ex moving your not going to have any overheating problems.

[beerock]

no the nikasil does make it run cooler, because there is less friction involved and nikasil is plated on aluminum and aluminum dissapates heat faster then a steel bore

[ZSK]

After winter you'll have to take mine for a rip.;) I'm sure you know the problems that I've had, but many have stemed from learning experience and lack of HD parts. Mine was initially put together with cheaper gaskets, stock head studs, stock valve components....the list of stock goes on. Basically it was a 440 piston and a bored cylinder. Since, the HD parts have gone in, cometic gaskets, FDO studs, HD rod, the reliabilty has drastically gone up. I'll have some new parts going in to make it run like it should. From this experience and the drag race between you and me I'm not fond of built engines right now. You beat me by a length or two and that isn't right.

You can build a good running 416 cheapest, a 426 on the stock sleeve can cause problems it is the last bore on the stock sleeve and will also leave the bottom very thin. A 426 on a 426 sleeve would be a much better combo. As for a 440, it will take quite a bit to make it run like it should, a new carb and rev box, along with a new battery will go on mine next. A 416/426 is a great size if you need high quick revving, the 440 is a torque monster. For me, it is a lot less fatigue than trying to keep an engine in the power band. Which ever you choose, do all of the HD parts when you build it, that way you'll only have to do it once.

[397ccEX]

I want my 400 ex to have balls to da wall power
Where you hit the throttle and it hits hard
416?
426?
440- just for top speed right?

[416exduner]

The 416 will have the best throttle response.

[beerock]

Originally posted by 416exduner
The 416 will have the best throttle response.

thats not true, if you build any of them correctly they will all have awesome throttle response.

[ZSK]

Originally posted by beerock
if you build any of them correctly they will all have awesome throttle response.

That's the key. Many people don't build the engines correctly for the type of riding they do. I know mine still isn't suited to how I need it to preform. At some point the valves and porting will have to be done, these along with the right exhaust and carb, will get you the best engine.

[DEAL]

my 416ex with 18" tires pulls 4th gear starts .. I love it .. I ran it for 3 tanks of gas traight in 30+ degrees celcius weather .. it still ran 100% .. I've only ever ridden a 440 before and I prefer the 416.

[416exduner]

No, the 416 is a faster reving engine just like the 450. So, it's going to have better throttle response and more pep than the 440.

[beerock]

Originally posted by 416exduner
No, the 416 is a faster reving engine just like the 450. So, it's going to have better throttle response and more pep than the 440.

it depends on the whole set up bro pipe, carb, valve setup/size, ignition.

[drgn_erth]

so if u go with a 440 kit you need different studs. thats a given from what ive read. anything else you have to replace to keep the motor reliable?

[RIDER11X]

Originally posted by K_Fulk
Nickasil wont keep it any cooler. But it will make the bore last a lot longer.

If you could get an aluminum 440 sleeve and have that nickasiled. It would run quite a bit cooler since iron is a better insalator than aluminum.

But good luck, for some reason no one seems to make them. You would have to get one made custom.



Nope, go to Duncan Racing for their PC4000 cylinder, nickasiled in bores starting at 440cc and up from there. Also they are machined from billet aluminum and have a better stud set up.:cool:

[K_Fulk]

Originally posted by RIDER11X
Nope, go to Duncan Racing for their PC4000 cylinder, nickasiled in bores starting at 440cc and up from there. Also they are machined from billet aluminum and have a better stud set up.:cool:

It still uses a steel sleeve though.

I did find a sight that sold aluminum sleeves but the guy is off his rocker on prices. If i got his sleeve I would deffinatley get it installed and nickasiled by someone else.

http://www.madmanengineering.com/400ex.htm

[FMFWarrior21]

Im lookin for something that revs fast out of corners so I guess the 416 is the way to go do you think I should put another rod in or will the stock rod hold up to the abuse of MX?Also should i get the bigger head stud kit also due to the head gasket problem with higher compression motors?

[TC426EX]

Youll want to definitely do the studs man... If you have the extra money, the HD rod would be great to do as well... The studs are a definite though...

[RIDER11X]

Originally posted by TC426EX
Youll want to definitely do the studs man... If you have the extra money, the HD rod would be great to do as well... The studs are a definite though...

Aren't the stud mods only needed if you go over 11:1 compression?:confused:

[397ccEX]

how does a hmf full do with a 416 and stock carb

[QuadJunkies]

Originally posted by beerock
it depends on the whole set up bro pipe, carb, valve setup/size, ignition. Exactly... My quad has beat a few 440's and it flat out hooks up right off the line......... GREAT Torque!!! :macho I cant imagine what a better Carb would do for it .....:bandit:

[torqen2k1]

Well I would go with the 426 because it has the torque of a 440 and has the fast rev as a 416. My neighbor has a 450r and I beat out of the holshot and even top end I pull on him. my other friend has a YFZ450 with a pipe and open air box he gets me by a little less then a quad. Also we weigh around the same and are almost the same riding skill.

[400exnac]

What about a 416 and a stock carb that has been jetted

[rr4406pak]

Does anybody have an answer for RIDER11X's question above???



Aren't the stud mods only needed if you go over 11:1 compression?

I would like to know the answer for this one as well....

Thanks in advance!

[beerock]

Originally posted by rr4406pak
Does anybody have an answer for RIDER11X's question above???




I would like to know the answer for this one as well....

Thanks in advance!

i feel the best thing to do is go with the stud mod. its insurance.