I Wanna Make My 400ex Rape A 450r Please Help!!!

[justin1022]

OK well my freind baught a kfx450 and then my other freind baught a 450r and now everyone is selling there 400s and going to 450s but i said screw that i like my ex it is a nice machine and besides i tihnk that low rider postition is gay anyway for me its just hard to wip around and stuff. so i thought of this bright idea... to make my ex rape any stock 450 i ride with and people around hear keep them stock so i have no worrys about them doing crap to theres. i called into my dealers and they said its not posible i said but ya one of my freinds have a ltz400 and it beats a 450r there big excuse was because its liquied cooled. but i dont got big money to be boreing to a 456 and stuff bigest bore i will do is 440 but im even sticky about that because i have herd lots of over heating problems with them right now i have hot cams stage 2 on order a stage 2 rev box and a dg bullit pipe full system it isnt on yet though im weighting for my other crap. do you gize got any ideas to help me make my quad own a stock 450?

http://photos-550.ll.facebook.com/photos-ll-sf2p/v253/207/50/594710550/n594710550_2953102_4638.jpg

[NickG5755]

..440... stage 3 hotcam...Port/Polish...450R carb as for the overheating it isnt bad... get yourself an oversized oil cooler and some metal shrouds

[red_rider_069]

idk about the 450 carb.. but a 440 with high compression piston should do the magic.. and yea overheating would bea problem..
you should definatly get air scoops.. and i'd go for bigger cooler.. like the cbr mod that ppl do.. and oversized reserve.. its gonna end up being quite a bit though.. not over 1000..
so goodluck :D

[justin1022]

Originally posted by NickG5755
..440... stage 3 hotcam...Port/Polish...450R carb as for the overheating it isnt bad... get yourself an oversized oil cooler and some metal shrouds

and your 100% sure if i do that to my quad it will beat a 450?

[red_rider_069]

Originally posted by justin1022
and your 100% sure if i do that to my quad it will beat a 450? well no.. depends.. what you riding on? if its track you can prolly keep up.. thats ends up being you mostly.. and the 440 jsut keeps you next to em.. but on a drag.. no way.. they are geared diffrently and havea higher top speed..

[justin1022]

Originally posted by red_rider_069
idk about the 450 carb.. but a 440 with high compression piston should do the magic.. and yea overheating would bea problem..
you should definatly get air scoops.. and i'd go for bigger cooler.. like the cbr mod that ppl do.. and oversized reserve.. its gonna end up being quite a bit though.. not over 1000..
so goodluck :D

well could i somehow throw a fan on the cooler? or somthing and what about the 440 someone told me the stock carb wont get the job done once you bore to a 440. and if i do do that to the quad will i have to run that expensive fuel?

[red_rider_069]

Originally posted by justin1022
well could i somehow throw a fan on the cooler? or somthing and what about the 440 someone told me the stock carb wont get the job done once you bore to a 440. and if i do do that to the quad will i have to run that expensive fuel? depends what compression.. with 91 pump feul highest id go is 11:1 compresison because of cooling.. and yes you could puta fan on it.. but i dont rememebr what fan you can put on.. mostly customised onto it.. i'd jsut get a 450 if your so woried about beating yours friends..

[justin1022]

Originally posted by red_rider_069
well no.. depends.. what you riding on? if its track you can prolly keep up.. thats ends up being you mostly.. and the 440 jsut keeps you next to em.. but on a drag.. no way.. they are geared diffrently and havea higher top speed..
ok well out hear we ride on track its my track so i ride on it the most and no it the most so i am top rider on it we change it up time to time together though but ya you tihnk i should drop a few gears so i will have the balls he has?

[red_rider_069]

Originally posted by justin1022
ok well out hear we ride on track its my track so i ride on it the most and no it the most so i am top rider on it we change it up time to time together though but ya you tihnk i should drop a few gears so i will have the balls he has? i know that dropping a gear.. such as your sprocket change front from stock 15 to 14 or somthing like that give you more acelteration so you rip out of turns fast.. and accelerate faster.. but with the 440 vs 450s you be right there with em.. but ithink its mosty rider on track.. after you get a 440 that is

[witech]

So you want your 29hp quad to "rape" a 47hp quad for under a $1000 . The only answer is nitrous. There are kits from $400 to $800. I seriously doubt a 400ex can get into the 50's without a ton of money and it will become a grenade as well. I do know a guy who got his 465ex to 49hp with dyno tuning. Of course he had several thousand into the engine . It lasted several months before it let go. it surprised many in drag races.

[red_rider_069]

Originally posted by witech
So you want your 29hp quad to "rape" a 47hp quad for under a $1000 . The only answer is nitrous. There are kits from $400 to $800. I seriously doubt a 400ex can get into the 50's without a ton of money and it will become a grenade as well. I do know a guy who got his 465ex to 49hp with dyno tuning. Of course he had several thousand into the engine . It lasted several months before it let go. i think your wrong pal.. but then again your right.. iforgot about exhaust and intake. aswell as jet kit.. so wit that said the big bore, exhaust, jet kit, and intake.. you will rape them.. and well since you already ahve some stuff i think you coud keep up.. adn even pass em.. i ride with 450s all time.. i keep up always.. n im better than some guys on track.. so.. idk what your talking about

[hypersnyper6947]

The guy i got my bike from said he beat 450's with it. I am rebuilding it now so i have not rode it yet. He had it at 12.5:1 compression though. He was also running 123 octane. My mods are in my signature.

[Ruby Soho]

my EX is a 440 with a true 11:1cp, a stage 3 hotcam, GT thunder studs (you need them with the high compression piston), a whitebros exhaust and a 450r carb.

i have pulled away from yfz's and 450r's many times.

now dont listen to the other guy talking about nitrous cause it is not needed.

the overheating is not a problem if you actually ride it. its air-cooled, therefor if your not bouncing off the rev limiter(which doesnt help..EX's loose power before there max rpm's) youll be fine, just keep it moving. ive had mine for over a year with no overheating problems ever.

if you want a monster engine, i would do this-

12.5:1 440 piston, an aftermarket crank, stage 3 cam, port and polish, 450r carb, and a NICE full exhaust such as the curtis sparks x6. and maybe some valve work.. you will want to put in the GT thunder studs, and a CRF450 cam chain. reliability is a big factor here. youll most deffinatly beat the 450's if you can ride.. but its not all machine

[witech]

Originally posted by red_rider_069
i think your wrong pal.. but then again your right.. iforgot about exhaust and intake. aswell as jet kit.. so wit that said the big bore, exhaust, jet kit, and intake.. you will rape them.. and well since you already ahve some stuff i think you coud keep up.. adn even pass em.. i ride with 450s all time.. i keep up always.. n im better than some guys on track.. so.. idk what your talking about


His question was how to beat a way higher horsepower quad with a 400ex for under $1000 . He didnt say he want to just keep up. Maybe the cost of cams ,big bore kits ,valves ,stroker cranks,springs,carbs,oversized valves,port jobs ,full exhausts and a trip to the dyno to tune it in to get the power he is asking for but around here its still well over that budget.
We have tuned stock 06 and newer yfz and 450r's to the upper 40's with no mods other than removing the pea shooter and the highest dyno chart at our local dyno for the 400ex was the 49hp one and that one sure as heck was a budget engine.

[justin1022]

Originally posted by Ruby Soho
my EX is a 440 with a true 11:1cp, a stage 3 hotcam, GT thunder studs (you need them with the high compression piston), a whitebros exhaust and a 450r carb.

i have pulled away from yfz's and 450r's many times.

now dont listen to the other guy talking about nitrous cause it is not needed.

the overheating is not a problem if you actually ride it. its air-cooled, therefor if your not bouncing off the rev limiter(which doesnt help..EX's loose power before there max rpm's) youll be fine, just keep it moving. ive had mine for over a year with no overheating problems ever.

if you want a monster engine, i would do this-

12.5:1 440 piston, an aftermarket crank, stage 3 cam, port and polish, 450r carb, and a NICE full exhaust such as the curtis sparks x6. and maybe some valve work.. you will want to put in the GT thunder studs, and a CRF450 cam chain. reliability is a big factor here. youll most deffinatly beat the 450's if you can ride.. but its not all machine

ok well i was lookin on ebay and bore kits with cylinders and all arnt much i think after what ive read i am going to go to a 440 and put a over sized oil cooler and the 450 timeing chain like you said but when i get to choose the compresion pistion that comes with the kit should i get 12.5:1 or 11:1? i dont have money to be buying fuel with 123 octaine in it...

[Ruby Soho]

run 93 in the 12.5:1 and pump in the 11:1

the 11:1 is more reliable, but the 12.5:1 will give you more power.

GET THE GT THUNDER HD STUDS!!!

[justin1022]

Originally posted by Ruby Soho
run 93 in the 12.5:1 and pump in the 11:1
GET THE GT THUNDER HD STUDS!!!

ya i heaqrd about that a dealer by my place told me they jsut had a 440 ex and it riped the studs right out i will for sure have to pick some up thanks.

but what do you think about sleaving compared to buying the actual cylinder? i heard if you sleve it, it will overheat more.

[justin1022]

Originally posted by witech
His question was how to beat a way higher horsepower quad with a 400ex for under $1000 . He didnt say he want to just keep up. Maybe the cost of cams ,big bore kits ,valves ,stroker cranks,springs,carbs,oversized valves,port jobs ,full exhausts and a trip to the dyno to tune it in to get the power he is asking for but around here its still well over that budget.
We have tuned stock 06 and newer yfz and 450r's to the upper 40's with no mods other than removing the pea shooter and the highest dyno chart at our local dyno for the 400ex was the 49hp one and that one sure as heck was a budget engine.


do you no how much about it cost you to do all of that?

[Ruby Soho]

Originally posted by justin1022
ya i heaqrd about that a dealer by my place told me they jsut had a 440 ex and it riped the studs right out i will for sure have to pick some up thanks.

but what do you think about sleaving compared to buying the actual cylinder? i heard if you sleve it, it will overheat more.

the new cylinder is gonna cost $$

sleeving works fine, just make sure you tell the machinest to make sure it doesnt sink, because thats a common problem because its pressed in cold and when heated up it sinks

[justin1022]

Originally posted by Ruby Soho
the new cylinder is gonna cost $$

sleeving works fine, just make sure you tell the machinest to make sure it doesnt sink, because thats a common problem because its pressed in cold and when heated up it sinks

ok, i will have to talk to the machinest then. would you no about how much hp i will be sitting at with a 440 kit a pipe filter hot cams stage 2 and rev box?

[Wheelie]

My setup is damn close power wise to a 05'R w/full exhaust, K&N Filter, HC Stage 1 and a 12 tooth sprocket.

My setup: 440 stroker from Powroll 11.3:1 compression, ported head, HC Stage 3, Yoshi full exhaust, 450R carb, filter and no lid. This setup will cost over 1k.

[Ruby Soho]

Originally posted by justin1022
ok, i will have to talk to the machinest then. would you no about how much hp i will be sitting at with a 440 kit a pipe filter hot cams stage 2 and rev box?

upper 30's

put on a 450r carb, it was the best upgrade ive made.

[MOON]

Upper 30's? Hah, My 440 is 43hp with 11:1 compression, cam, pipe, & jets.

[hypersnyper6947]

My cylinder is at gt thunder right now getting re sleeved and getting the HD headstuds put in. For all this machine work plus the HD studs its right at $240. But mine was already a 440 before, so less machine work. I picked up my piston sleeve rings all that stuff on ebay for like $180 shipped and there wiseco. I also picked up the stage 2 hotcam from ebay for like $140 shipped. I hope this can give you an idea of how much it may cost you. Good luck! my goal is to mop up my riding buddy on his raptor 660, and of coarse any 450's i see out there.

[justin1022]

Originally posted by hypersnyper6947
My cylinder is at gt thunder right now getting re sleeved and getting the HD headstuds put in. For all this machine work plus the HD studs its right at $240. But mine was already a 440 before, so less machine work. I picked up my piston sleeve rings all that stuff on ebay for like $180 shipped and there wiseco. I also picked up the stage 2 hotcam from ebay for like $140 shipped. I hope this can give you an idea of how much it may cost you. Good luck! my goal is to mop up my riding buddy on his raptor 660, and of coarse any 450's i see out there.

can you beat 450s already?

all i have to sya is 440 stroker! My friend had a decently modded 440 stroker and it would rape a 450 in a drag and stuff. The 450's wouldnt have more than an exhaust, air filter, maybe a cam though but still.

[justin1022]

Originally posted by FoxHondaRider
all i have to sya is 440 stroker! My friend had a decently modded 440 stroker and it would rape a 450 in a drag and stuff. The 450's wouldnt have more than an exhaust, air filter, maybe a cam though but still.

ya but then you have to run that exepnsive gas with liek 123 octaine

[NickG5755]

dude... 11:1 440 w/ HD headstuds ...stage 3 hotcam...450R carb...full exhaust..

if you have some skill youll rape them..esp if its your own track that you should know better than themwith the 11:1 you can run pump gas in it.. if you have a E85 pump near you set your biek up to run on that and get the 12.5:1 kit..E85 is like 105 octane and it makes your biek run a hell of a lot cooler ...all ya gotta do is fatten up your jetting and your bike will run on it it shouldnt be a whole lot more than a grand with this set up..

[hypersnyper6947]

why the stage 3 hotcam, i heard you only need stage 3 if you are running a stroker. With a normal 440 i heard that stage 2 is the best. Does anybody have any info that says otherwise. If so i need to return my stage 2 and get a stage 3 before i put it in.

Originally posted by justin1022
ya but then you have to run that exepnsive gas with liek 123 octaine

no you dont. pump gas is fine depending on what compression you go. My friend ran a 50/50 mix so lets say 98 octane or so on the compression he had

[justin1022]

Originally posted by FoxHondaRider
no you dont. pump gas is fine depending on what compression you go. My friend ran a 50/50 mix so lets say 98 octane or so on the compression he had

what compresion was he running?

[mooseracerX]

Another thing you'll want to think about doing if you want to keep up with 450's in a drag is change the sprockets. I had a 16t front and a 38t rear and my 416 hauled I'm not quite sure how fast it was but it felt fast. You could drop down to 35t rear since your 440 will have enough nuts to pull it. I don't know where you can get a 16t front or if you would want to use one because you would have to take the case saver off.

[NickG5755]

stage 3 is for BIG BORES in general which counts strokers..

[hypersnyper6947]

Originally posted by NickG5755
stage 3 is for BIG BORES in general which counts strokers..

so this would be more beneficial to me with my 11:1 440 than the stage 2 cam would be

Originally posted by justin1022
what compresion was he running?

i think it was 11:1 but he would mix it some. Maybe i'm wrong maybe it was a little higher idk

[justin1022]

ok so ya i think i will get the 11:1 440 kit thanks for the help does a 450r carb really do alot?

[TheNewn]

Honestly, i think it's a lost cause to try and make the 400EX beat a 450R motorwise at least.

If your goal is to just beat a stock for 450 for power in a race, all they would have to do to beat you again is slap a pipe on there and you'd be right back where you started.

If you *HAVE* to keep that 400EX, i'd focus more on comfort/handling mods than motor mods...

But, i'd seriously consider getting rid of it and getting something else.

[honda300EXtreme]

the sentence spank 450's and limited budget, can not go together

sure you can dump 1000+ into your motor and walk away from a stock 450 on black top, and then they do the basic mods and put you back at sqaure one.

i say build your 400 so its got the power, reliability, and the comfortability so you can spank them 450s on the track and in the woods where it counts.


i mean a 440ex, with HD studs, stage 2 hot cam, 39mm FCR, good full system, and a well vented air box, will have enough power to get you where your going in a hurry,

then spend some money in suspension and youll have a nice 400ex


just my thoughts though

[NickG5755]

the 450R carb makes a huge difference.. esp after you put a big bore in the bike...that stock carb holds it back big time

[Ruby Soho]

the carb really does help.

dont forget, if you wanna beat the 450's on a strip its gonna take alot of engine and alot of rider

if you wanna beat them on the track its gonna take less engine and more rider.

[jedneck]

make ur 400 a 450

[justin1022]

Originally posted by jedneck
make ur 400 a 450

is it hard mountin that engine in?

[400ex28]

Some motor work, suspension and a good rider can take a 450.

[TCracin440ex]

Originally posted by TheNewn
Honestly, i think it's a lost cause to try and make the 400EX beat a 450R motorwise at least.

If your goal is to just beat a stock for 450 for power in a race, all they would have to do to beat you again is slap a pipe on there and you'd be right back where you started.

If you *HAVE* to keep that 400EX, i'd focus more on comfort/handling mods than motor mods...

But, i'd seriously consider getting rid of it and getting something else.


the smartest thing said in the WHOLE thread....i went from a 400ex to a 450r and would i do it again....ANYDAY....450r hands down is twice as fast as a 400ex...most of yall are comparing apples to oranges here. now if he woulda said he wanted it to rape z400s and other sport quads this would be a logical post...why spend 1000+ dollars on a motor that has to run on 110 octane or higher, and he could sell the 400ex, get a 450, and make his 450 faster for less money??? pipe, cam, airfilter, jet kit, and maybe an ignition. then the other 450s would be trying to keep up....

and if hes worried bout the low feel of the bike all he needs is a taller steering stem and it will feel exactly like a 400ex

[BigBore24]

ahh ok just sell the ex and get a 450r. thats it i think ill do it too....only problem your gonna have to add at least $2000 dollars to the money you get for the ex for a decent 450. so why not spend 1k and have one thats halfway comparable in power if thats what your after. i think 1000 should be plenty to have a nice build if you can do the work yourself and you shop wisely.

[TCracin440ex]

ha u get get nice used 450rs for right roud 3800 range? go figure?


he didnt state that he wanted to be able to keep up with 450s, he stated he wanted to RAPE them...as in totally smoke them hands down

a decently modded 400ex can HANG with a 450 depending on the rider and the terrain, but in a drag a 450 will win anyday

[jedneck]

It wasn't to bad but if I didn't already have my suspension I would have just bought a 450

[HondaRaceReady]

Your best bet is to sell your 400ex and buy a honda 250r or a suzuki 250 quad racer. I'm sure you could buy one cheap. The new 450 racebikes pull hard in low rpms, but the old 2 stroke race bikes pull hard throughout the entire powerband. You will rape their bikes trust me.

[leas450]

your bringing a kinfe to gun fight on this one. Me and my buddies all had built 400's. Then the 450's came out and we got smoked on the flat tracks and mx. The woods all depends on the rider because power ain't everyrthing if you can't keep it off the trees. There are ocasions when i have seen ex's beat 450's but it was usually something not going right on the 450's start and the guy on the 400 knowing how to block. the dude's telling you to do this and that mod need to face the facts. Those bikes are the faster bike. Luckily your bike can still handle great and is probably the most reliable sport quad on the market. Do the the suspension get a pipe and jet kit and enjoy just being able to hop on and thrash that thing all day every day. If that won't make you happy you need to sell that thing and get a 450 cause you can't beat those 450's will $1000 to spend on mods.

[HondaRaceReady]

At least make it a 440 stroker with 12.5:1 compression. You'll rape them until your bike dies, which could be soon with that setup.

[Slapasack]

my friend that owns a 450r with the hrc kit installed and hmf bill balance edition pipe that is geared down to 13 tooth up front told me one of our friends just got a 460 stroker ex that is faster than his 450r but i dont know too much about the ex cuz i havent seen it or ridden it yet