Hp?

[xX-Clutch-Xx]

I put a wiseco 416 11:1 piston, stage two hot cam, i have a hmf full exhaust, 42 pilot and i havent checked the plug yet but a 170 main. stock is about 28 so id think i gained maybe 5 hp with those mods?

[dxcody]

my guess would be about 33-35

Full out 400ex race motors will pull about 40

[xX-Clutch-Xx]

my next upgrade will be a good head port, and a 39 fcr :eek2: something in me wants to get lte dual pipes :D or a sparks. but i want it to stay gold

[dxcody]

You may want to get a second opinion on that, i believe CJM said that 11:1 400's with the typical mods (exhaust hotcam +jetted) push around low-mid 30's.

I remember a post on here about some 400ex that had the baddest engine ever on craigslist, it was something crazy, like a 16:5 compression ratio, and i e-mailed the guy and he said he pushed around 45-50 HP which is just insane on a 400ex.

Chris Borich (GNCC XC1 3x champ) pushes like 65 or 70 out of his yoshimura LTR i think.


A port and polish is never a bad idea, i think motoxperts is about the top dogs around for porting and stuff.

[crownandmonster]

A properly worked 416 will have no problem making 35-38 Hp

[atvrider13]

A larger carb like the 39mm FCR will give you a big boost in power! I dont know how much hpower it will give you but it will give you alotta throttle response and will be and feel alot quiker

[atvrider13]

A larger carb like the 39mm FCR will give you a big boost in power! I dont know how much hpower it will give you but it will give you alotta throttle response and will be and feel alot quiker

[xX-Clutch-Xx]

Before the motor work all i had was the exhaust and i could almost keep up with a 525 outlaw. Now he can hardly touch me haha. I tink the carb and porting, anot sure what else i can do to keep it rideable for long periods of time

[xX-Clutch-Xx]

And idk why but i almost have a fetish for dual exhaust. but its 800 $s lol. but they look and sound amazing on a raptor :eek2:

[01boneless]

450rs come stock with like 34hp and th guys on org estimated 40 when im done so i could see your 400 setup making 33-34 hp. add the fcr and a port and polish and you may make it to 38. is the lid still on your airbox?

[CJM]

Your talking your gonna make somewhere around 33-38hp at absolute peak, under ideal conditions. Chances are most likely it will be closer to 31-35hp at best. No slouch, but understand a suzuki LTZ/KFX/DVX is already making 30 from the get go, and the 450s are already making mid 30's from the get go as well.

If anything what really makes most happy isnt the overall power they get out of the bike-but how fast you can build that power.

[crownandmonster]

Correct me if I am wrong but I believe it was Steve who posted his numbers a while back. He was running a mildly built 416 just like 80% of the people on here and the bore had 2 years ride time on it and he still posted 36 HP. A properly worked 416 should produce 35-38 hp and still be very reliable. Now of course every dyno is different and steves bike might have only put of 34 on a different dyno.

[honda400ex2003]

i ran 34 hp with my 10:1 416, stage 2, minor port and polish, slip on, 6 degree key, and 450r carb. that had about 2 years on it as crown stated above. It wouldnt have made any more power new after breakin though imo as it did that day.

450r's run about 38 hp stock on the same dyno.

rossier has numerous dyno charts of most of the 450 machines. I had my machine dynoed on their dyno.

http://img33.imageshack.us/img33/7978/dynorun416ex.th.jpg (http://imageshack.us/photo/my-images/33/dynorun416ex.jpg/)


steve

[honda400ex2003]

http://www.rossiereng.com/images/dyno/trx450_06-09.gif

http://www.rossiereng.com/images/dyno/trx450_04-05.gif

[CJM]

Bingo Steve!

[honda400ex2003]

lol this isnt my first time through these hp debates, with a bit of searching most of these topics have been discussed numerous times and are posted in numerous forums. its always fun to see the different numbers that people come up with though :D

stee

[crownandmonster]

Exactly 34 hp with mild work, throw in some more compression, better port work, a better cam, and a better exhuast and 38ish HP is not unrealistic. Not trying to stir the pot its just my opinion of what would happen.

[honda400ex2003]

agreed, it would take oversize valves, long duration cam, and good porting to be at 38, making it more of a specialty build to get 38 out of a 416 even with 11:1 compression imo. 36 wouldnt be unreasonable though with a full exhaust and 11:1 and a bit of work on porting.

imo my 416 was worked except for a header and valves. I had pretty much as much hp as i could pull out of that 416 as i could without running a full header and spending alot more money on it.

yes compression makes a difference but it does more to increase low and mid range torque than it does to make overall hp. total hp stays about the same.

variation in dynos is a bigger factor than that most of the time lol.

steve

[xX-Clutch-Xx]

Im not trying to make a powerhouse but i do wanna get a cheap 400ex and make it a 465 stroker with a turbo <<<<< how that sound haha

[crownandmonster]

As soon as you put 465 and turbo in the same sentence cheap went out the window.

[honda400ex2003]

along with your sanity haha

good luck with it though. most people dont succeed in doing turbos.

steve

[dxcody]

Originally posted by crownandmonster
As soon as you put 465 and turbo in the same sentence cheap went out the window.

^^^ exactly what i was thinking.

Would be cool tho.

[xX-Clutch-Xx]

that would be my 4 year project haha. To stroke it does the case need machine for a taller crank or is the rod longer and the wrist pin moved up on the piston?

[xX-Clutch-Xx]

ok, so now i completely understand how to stroke a engine and i think the only obstacle would be the sleeve. unless it has enough clearance with the rod and id need a custom piston. And im pretty sure i can work a turbo out. just might take a while haha

[dxcody]

GT Thunder makes a stroker motor for $1500 which really isnt that bad of a price at all.

[CJM]

In all honesty by the time you stroke, work and whatnot an EX its just more worth it to buy the 450.

[thebig450es]

Mine makes low 40's HP, but i've put alot of work into it.

[xX-Clutch-Xx]

im happy with my 416 right now, but i would take a good price lol. i just want to make something really badass that no one has, but id never do that to my daily rider. My dad and hist friends, 30 years exp, oppose 3 things. !-Polaris 2-Not wearing a helmet 3-450's lol

[05DodgeDakota]

440s are pretty common, but you rarely see 450, 460, 465, 500 EX's.

[Pipeless416]

Originally posted by 05DodgeDakota
440s are pretty common, but you rarely see 450, 460, 465, 500 EX's.

i would guess that the reasoning is because most of the people that are that power hungry have already moved on. i understand you not wanting to have something common though. you just don't see things bigger than 440 very often because you'll be sacrificing the reliability with the extremely thin cylinder walls and high amounts of heat. Nacsmxer has the GTT 452 stroker kit and he seems to have had very good luck with it.

[thebig450es]

I love my gtt stroker, its hands down a sweet ride with how much tq it makes

[xX-Clutch-Xx]

just out of curiousity, did any case mods to the top or sleev have to be made?

[Wheelie]

My stroker has been strong and reliable for over 5 years, no mods to the crankcase or cylinder were required (except boring the cylinder to fit the 87mm piston).

I estimate my setup to make about 42-44hp. If I went back to race gas and pulled a degree or 2 of timing, it'd be 39-40hp.

[xX-Clutch-Xx]

and if i saved some cash and put a turbo on it? yeahhhh big number little quad haha