Port & Polish = More Power?????

[400exguy]

I am thinking of porting my head and polishing that baby installing 4 new valves stainless ones.. Cam web probably maybe hotcam stage 1
already have 10:1 comp piston looking around 800 bucks I was told this setup would outrun a 450 what do you guys think

I know a guy who has this done and he outrun a 450r his goes 86 mph thats 16 tooth cdi box and 22" tires

[MOFO]

your gonna need ALOT more than just a P&P head, cam and 10.8:1 piston to beat a 450R...

Thats a fact.

[rneal]

Sounds like somebody is blowing smoke up your *****.

[rneal]

Read this guy's view on the topic.

http://www.mototuneusa.com/think_fast.htm

[Kilabanshee]

Originally posted by MOFO
your gonna need ALOT more than just a P&P head, cam and 10.8:1 piston to beat a 450R...

Thats a fact.

I'de have to say you wrong. I have both a 450r and 416ex. My 416ex with a 10.8:1 piston, ported head/valve job, hotcam stage 2, yoshi exhaust, and k&n filter has no problems beating a stock 450r. I can sometimes even beat a stock yfz If I get a good start off the line.

[MIKE400EX]

Must be the cylinder head Kilbanshee!! LOL;)

[400exguy]

I am just telling you guys what a local had to say about it. He has been doing this kinda work for 25 years.. I have to say he knows a lil something

I have seen his work and it is mind blowing.

The guys 400 he did will run 86 mph.. he said the 450r is there with him until 3rd then he just pulls away

thats what he says.... I was just thinking should I do the same to mine?????

[400-416EX]

Yes get it done. I have my 416 port and polished and all done up. And it screws. You won't be dissapointed

[cals400ex]

did the 450r have the hrc cam or the stock one? if it had the stock one, your ex should beat that. as a matter of fact, i haven't raced a stock yfz yet that was quicker than my bike. but then again, i haven't raced a piped and jetted one that didn't pull away from me. i haven't raced a 450r yet but i have a feeling a stock one wouldn't have a chance. by the way, i am talking about a drag race. we even raced on paved surface so we could figure out whose bike was quicker and this eliminated traction issues.

[2muchquad]

sorry but a port job and cam wont help you outrun a 450.i hate to be the bearer of bad news but somebody is blowin smoke.a buddy of mine who races gncc's with a 440ex and just about every mod done to his is complaining about getting pulled on the straights by the 450s with just pipes!he catches them in the woods though.

[MOFO]

Originally posted by Kilabanshee
I'de have to say you wrong. I have both a 450r and 416ex. My 416ex with a 10.8:1 piston, ported head/valve job, hotcam stage 2, yoshi exhaust, and k&n filter has no problems beating a stock 450r. I can sometimes even beat a stock yfz If I get a good start off the line.


then you must have ONE FREAK 416ex... :rolleyes:

[400exguy]

yeh for 800 bucks I think I will give it a try..

which cam do you think hotcam or web

[Kilabanshee]

Originally posted by MIKE400EX
Must be the cylinder head Kilbanshee!! LOL;)

Sure is Mike you did a great job! If any of you don't believe me then you go get a stock 450r and race me. Why would I lie when I have both? I have a witness who saw me beat a yfz up at rausch creek. So mofo just shut your mouth because you obviously have no idea what your talking about:rolleyes: Mike400ex makes some sick 400 motors!

[MOFO]

Originally posted by Kilabanshee
. So mofo just shut your mouth because you obviously have no idea what your talking about


sorry, but I just find it funny. I've rode a 450R with the HRC kit and I've riddin a few 416's and 440's that have been built up. No way a 416 10.8:1 piston, cam and a ported head will take a 450R (drag race)...sorry aint gonna happen...I dont care how much somone massages the motor. You can only get so much reliable power out of the 400EX motor. The 450 is a completely different motor. Like I've said, I've yet to ride a 416 or 440 that compares to a factory 450R w/HRC kit. I"ve never ridden a 450 without the HRC kit.

Now on the track, thats up to the rider... any quad can beat any quad on the track (rider is biggest variable)

If you do have a 416 with just the mod's you've listed, you have a freak 416. I'm just basing my opinion on other quads I have ridden... various 416's, a 425 decked out and a couple 440's... and the HRC 450R has more balls and all of 'em.

[khen]

My 416EX gave my buddies YFZ(jetted, pro-flo and baffle removed) a good run. He has since put on a full NMotion exhaust, Dyna CDI and did the cam mod so we'll have to see how it goes now. I also just put the 450R carb on mine which feels like I gained some good power to.

A well built 416EX with the stock carb should put out 35-38hp add a carb and it should be closer to 39-42hp. The 450R/YFZ put out roughly 36hp stock.

Why is it so hard to believe that a 416EX can beat a stock 450??? :confused:

[sampleez]

idk, your bikes must be special. or the people you raced sucked at draggin. my 400 had a 11:1 416cc wiseco, ported head, hotcam stage 2, pipe and filter, and I can tell it wouldn't have $hit on my yfz. and how cares if it will keep up with a stock yfz. how often do you see a stock one anyway. as soon as the yfz has a pipe(or even the baffle out), the cam mod, and the air box lid off your back to gettin smoked. i really liked my 400, but after riding a yfz it felt like a 90.

[Kilabanshee]

Originally posted by MOFO
sorry, but I just find it funny. I've rode a 450R with the HRC kit and I've riddin a few 416's and 440's that have been built up. No way a 416 10.8:1 piston, cam and a ported head will take a 450R (drag race)...sorry aint gonna happen...I dont care how much somone massages the motor. You can only get so much reliable power out of the 400EX motor. The 450 is a completely different motor. Like I've said, I've yet to ride a 416 or 440 that compares to a factory 450R w/HRC kit. I"ve never ridden a 450 without the HRC kit.

Now on the track, thats up to the rider... any quad can beat any quad on the track (rider is biggest variable)

If you do have a 416 with just the mod's you've listed, you have a freak 416. I'm just basing my opinion on other quads I have ridden... various 416's, a 425 decked out and a couple 440's... and the HRC 450R has more balls and all of 'em.

I'm talking about a bone stock 450r right off the showroom floor will not beat my 416ex in a drag. Look buddy I own both quads and I know this for a fact. If you would like to come down and challenge this then go right ahead. Keep in mind I have the mods below. Now the 450r with the hrc kit is a whole different race against my quad. I know for a fact a 416ex with a 10.8:1 piston, xr400 head gasket, fcr 39 milli carb,tc exhaust, porting, hotcam stage 2, valves, filter ect done right could beat or stay right with a 450r with the hrc kit. But keep this in mind you just spent over 2-3 grand to make your 400ex equall with a stock 450r with around the 3 hundred bucks that the hrc kit cost.

kibblewhite valves
yoshi full exhaust
10.8:1 piston
hotcam stage 2
porting/3 angle valve job
k&n filter with an open airbox
Bored stock carb

[panteramatt]

Listen, a well built 416 with everything done to it will outdrag a bone stock 450r and maybe even a yfz if your lucky. But like everyone says, all it takes is a simple pipe and the 450's are gone. I have a 500ex and I have a stock yfz450 with the airbox lid off and baffle removed only and it will easily keep up with my 500 and maybe even beat it there just that fast face it!:macho

[cals400ex]

i honestly think you can beat a 450r with the hrc kit too. however, i havne't raced one but from what i read they are a bit slower than the stock yfz's. i made a mistake in my previous post. i tried to say that i haven't been beat by a stock yfz yet but i have NOT beat piped one yet.

[2muchquad]

you can only get so much from the trail bike based motor of the 400ex(xr).lets face the facts,sure they can be made to run NUT they are air cooled for crying out loud!lets use them for their intended purpose,SPORT riding,they arent in the same classas the newer racing 450s,sorry:D

[Rico]

Mine kept up with a couple 450's just fine in a WFO field section about 2 weeks ago. They were all piped too but had airbox lids. IT's not that far fetched beleive it or not. Next time I ride with these guys, we're gonna drag race to see what's up.

[CC Rider]

You guys crack me up, how many times have we had this discussion. There are obviously many different variables that can come into effect with these talks. My 416 will take a stock 450r/yfzat the sand dragsand my freinds quad, same thing but with fcr carb can take a few piped 450`s but dont get me wrong the 450`s are fast!:D

[Rico]

Originally posted by CC Rider
but dont get me wrong the 450`s are fast!:D

Yuuuup and the yami seems way faster than the Honda to be honest.......:eek2:

[sampleez]

especially with the cam mod. whoooowie it friggin rips :eek2: :devil:

[cals400ex]

yep, that is unfortunate because i think i am going to get the honda. i don't know the reliability of the honda, but the yami's that my buddies have had more problems in a year than all of the ex's combined in my town. and the ex's are 01's and older.

i will just have to modify it a bit i guess.

[sampleez]

what year was it. the 04's had a bunch of probs. but the 05's are supposed to have most of those fixed. it don't matter what ya get, you'll prolly always have some probs every once in awhile. the honda might be more reliable, but i got the yammi cause it's faster and looks alot better, imo

[duke416ex]

you all missed a big point. That 16 tooth sprocket, 22" tires and rev box are going to give that 416 a lot more top end. I am not saying a 450 isn't bad, but it isn't impossible for a 416 to beat it. I saw a lot of 300's beat 440exs and everything else around. Most of it is in the rider.

[cals400ex]

Originally posted by sampleez
what year was it. the 04's had a bunch of probs. but the 05's are supposed to have most of those fixed. it don't matter what ya get, you'll prolly always have some probs every once in awhile. the honda might be more reliable, but i got the yammi cause it's faster and looks alot better, imo


my buddies all have 04's. i have read that yamaha tried to fix the battery/rectifier/stator problem for 05 but i have already heard of the same problems on the 05's. i have heard the new 450's go through rings quicker too. well, one of the 04's is already shot. he isn't all that hard on the bike and does change the oil pretty often. well, i know the ex's have been ran much much harder and still aren't burning oil. also, two out of the three yfz's here have bent axles. they only hit the same jumps as we all hit on our ex's. i just can't deal with all that. your right though, the yfz's are quicker from what i read.

[sampleez]

i already bent my stock axle. but they warranted it and i'm gettin a new one for a backup. i guess they have bad ones now and again.

as far as the rings go, does your 400ex rev to 11k at 12:1 compression? according to the manual, i think your supposed to change the rings like every 20 hrs! but i know of several people with yfz's over a year old that still run fine. and maybe they didn't break them in right.

[TCracin440ex]

Originally posted by sampleez
and maybe they didn't break them in right.


what you mean "break them in right"...breaking them in right is by riding the piss out of them according to moto tune usa...and i broke in my 400ex like that and been riding it for 3 years....my buddy didnt break his 04 raptor in like that, and has already had to rebuild his topend

[gotahemi2004]

ive never driven a honda 450 yet i own a 400 ex bored to a 440 with every thing possibly to be done to it .. and my yfz which is pipes , intake , and jetted is 100% better bike all the way around and theres no way my 440 would hang with it ... when i get the 440 back again im hopeing it iwll be rihgt with it its getting suspension mx tires and a 12.5:1 comp pistion well see when i get it back if it will hang but i still have doubts about that..

also other things ive noticed is those 416's do run like a bat outta hell.. so it is very possibly one could take a 450 dont hink 10:1 will do it but possibly a 12:1

[kargaaro]

before my 450 I had a 416 high compression with port/polish cam valves what else? Anyway I through a pipe and filter on my 450r and I wouldn't take the 416 back for anything. You can build any motor up to beat it in a drag but it's got better response throughout. Plus I no longer am spending $4 a gallon on race fuel.:macho

[cals400ex]

Originally posted by sampleez
i already bent my stock axle. but they warranted it and i'm gettin a new one for a backup. i guess they have bad ones now and again.

as far as the rings go, does your 400ex rev to 11k at 12:1 compression? according to the manual, i think your supposed to change the rings like every 20 hrs! but i know of several people with yfz's over a year old that still run fine. and maybe they didn't break them in right.



my 400ex revs well past the stock rev limiter. when drag racing, i hit the stock rev limiter in at least the first 3 gears. i have hit it in 4th before, but not too often. i now run a gt thunder box that lets me benefit from the extra rpms. i am running a 11:1 piston with no base gasket and a thin head gasket. i am not trying to argue but the stock yfz is burning oil bad now. i am not. even though that bike may rev a bit higher and have a little higher compression, my bike is simply faster. the piped ones are quick but the stock ones aren't anything too special. i realize compared to a stock 400ex it is no contest. however, the reliability is no contest either when comparing bikes. from what we have experienced a built ex still out lasts the yfz. i have no experience with the 450r so i can't comment there. there may go through rings just as fast, i don't know.


all of my buddies had to buy new axles. the dealer claims they were jumping beyond the bikes ability, which is horse crap. oh well, it wasn't me replacing the axle.

[sampleez]

by stock, do you mean with or without the baffle in? i guess your dealers suck, cause i ride with the parts manager of the dealer i got mine from, and he saw me ridin the weekend i bent it, and i was jumpin a 80 ft tabletop, and he still warranted mine. but it was only a week old, so i guess that could have somethin to do with it

and yes tc, i meant wrong as in babying them.

[cals400ex]

Originally posted by sampleez
by stock, do you mean with or without the baffle in? i guess your dealers suck, cause i ride with the parts manager of the dealer i got mine from, and he saw me ridin the weekend i bent it, and i was jumpin a 80 ft tabletop, and he still warranted mine. but it was only a week old, so i guess that could have somethin to do with it

and yes tc, i meant wrong as in babying them.


the baffles were still in on the yfz's. yeah, our dealers do suck. both bikes were still under warrenty but won't do anything about it. i am wondering if they claimed to yamaha they might have got something out of it. oh well.

[DiRTdiGGr660]

Originally posted by TCracin440ex
what you mean "break them in right"...breaking them in right is by riding the piss out of them according to moto tune usa...and i broke in my 400ex like that and been riding it for 3 years....my buddy didnt break his 04 raptor in like that, and has already had to rebuild his topend

actually fu**er i did ride the piss out of it when i got it..and u kno for a fact that it was the airfilter that messed my motor up..quit liein to ppl :rolleyes:

[400exredrider]

YFZ is faster than a 450r with the HRC but both motors have equally the same amount of potential.. but also, both are going to need rebuilt alot more often than a 400ex... most 416ex if built right last a long time,, im waiting to get my 416 against my modded 450r.. has HRC kit and Full HMF for engine mods, along with a K&N, so we will see how it turns up but honestly,, if someones 416ex beats stock 450s, let them be happy, they probably spent 800+ to get it to do that! so theyhave a right to be happy i personally think a YFZ or 450r can not match the midrange pull of a 416ex i have YFZ, 416 and 450r the 400ex i picked up real cheap and threw a 416 in it and im satisfied with it since it only cost me 2000 total for the quad and work and parts,,, heres what she has and im pretty happy for it

JE Sparks Thermal coated 10.8:1
Hotcams stage 3
Full port job
FCR 40mm
ground out stock header and WB Slip on
K&N

the thing is insane for a 400ex i mean comeon! :D Rico swears by his 416!

[2muchquad]

i cannot comment on the 416ex but i beat a 440ex by a long shot.i also smoked some z400s with pipes but otherwise they were stock more or less.im still waiting to run up on a yfz450 though.i rode one stock and i wasnt impressed.i guess a pipe really wakes them up.so if anybody lives near ohio,come on out with the 4 fiddy and lets race.i only have a lil'blaster.:D it does have a 2000 cr250 motor with a ESR cylinder.i will put my 50hp blaster against any 4 fiddy..who wants to race..:D

[Rico]

Had a drag race against another good rider this weekend.

My 416 vs 450 with HRC Kit and GT Thunder full pipe

Ran right next to him up thru 4th gear and then we had to back down. I think I hurt his feelings......:o