I was wondering what do I have to do to make my z400 out run a YFZ450? I have never raced one, but if I came up on one I want to blow it away....

Heres my mods so far:
Lrd Pro 4 series full exhaust
cdi box: Dyno-tek (programmable)
Dyno- jet kit 160 main, 25 pilot, and set on the 3rd clip
trail tech flywheel
k&N filter with open lid

big bore/stroke/turbo and nitrous.....you never said how bad you wanna beat them by

hopefully that K&N is a clamp on style, and you should swap out your valve springs for drze's, so you might as well get the drze kit and a set of cams.

you should be pretty close, but it all depends on rider skill/rider conditions, etc. etc.

new carb would be good too.

Can't imagine him even getting close without a big bore kit + ^^^^^. My buddy's got an 05 YFZ piped and jetted and any time we race it can go either way depending on rider performance. Those things are just plain stinkin' fast

Oh yeah, even stock yfz's are quite a bit faster then any mildy modded z. a yfz with just a pipe is a drastic improvement. For just a stok yfz i would say big bore and the supporting mods andit would still be close, but im sure some memebers have more personel experiences with yfz's

Rode his a few times. Handles great, jumps great, fast as hell. Would never trade for mine!

ok... so where do i get a turbo kit for a carb. setup???

I don't mean to sound like a wiseguy but if you want to beat a 450 ditch the 400 and buy a 450-525. Why build a $8000-$10000 LTZ (including new bike cost) when you can go and buy a new KTM 525 or a wide variety of quality 450s out there that will flat out rip your arms out of their sockets for about the same $$.

Now if you love the 400 or want to build your own unique beast thats another matter.

Don't get me wrong. I love my KFX 400 and I dont ever see it leaving our stable but if you wanna be competitive in the drags..............................

Buy my Big Bore Stroker 470 engine.

Pink muffler bearings will also give about a 40% hp increase!

Strap it to the top of a Lamborghini!

Wouldn't the answer be obvious......
Its the same in all kinds of racing.

Make the motor produce more power, and then upgrade the suspension to put the power to the ground.
Practice riding/driving to become more skilled than the other person.

I bet you don't get the Speed channel.

http://youtube.com/PinksAllOut_Z400_Beating_YFZ450

Advantage head work (DRZe kit)
carb
Athena
pipe
ignition

Should beat a piped yfz. My friend (with a yfz) talked trash, alot... It took a bucket of money but I whipped him... It was fun.

i don't get that. the link says z400 beating yfz450 but then the movie is just the host of the show wiping out on a rocket?

Lose weight and race against a fat guy.

well I got bigger tires on the rear.. Where can i get stock rear tires at for cheap? I got holeshots on there now... Also I want to know if a set of HotCams makes a big difference through mid and top?

"i don't get that. the link says z400 beating yfz450 but then the movie is just the host of the show wiping out on a rocket?"

I was only kidding.....

That show is a freaking joke and so is the host.

me neither... Anyone selling a yfz 450

I've got pretty much brand new stock tires that I'll sell you. PM me if your interested.

Buy a Honda 450R and bolt your plastic to it...

i got Yoshi full pipe k&n clamp on hotcams dyna programmable and jetted and i can beat/keep up with my buddies piped and filtered yfz

what kind of jet kit are u running and what main, pilot, and elevation are u at? Also how much difference did it make when u installed the cams?

dyno jet right around sea level ill have to get back at you bout the main and pilot, cant remember since i didnt put it in ha....cams-seemed to pulled harder in the mid and top end so yea you can feel it in the "seat of the pants dyno"

Now that's impressive. I wouldn't have thought a Z with just those mods, no carb or BB kit, could beat a piped and filtered YFZ. No offense, but is he an inexperienced rider? With my mods I can barely fry a YFZ...at least one that runs really well...

I dont know what to believe any more because with the mods I have, I cant beat my buddies 07 Z400 stock.. He has out run a 450r, 660 raptor, 700 raptor, ktm 525. It just doesnt make any since. However I have more weight then him with the nurf bars,skid pates chain guards, bigger holeshot tires. I think it is the tires that is slowing it down alot though, but i bought the bike like that so I dont know if it did or not...?

He outran a KTM 525 and a Rappy 700 on a STOCK Z? again

What does he weigh?

He'd have to weigh about 70 lbs to pull that off!

I was thinking remote control .

I think the BS flag needs to be raised here! I'm not buying it. Maybe the 660, but not the 450r or the 700! I can't speak for the KTM

about 125lbs wet... Man I have seen it with my own 2 eyes. He just smoked the 660 raptor. He pulled the 450r 3 bike lengths and the 700 2 bike lengths... U can say what u wanna say, but I think hes got a fluke or something... Its like he cant be beat.. I have rode the damn thing and it faster then mine(stock).. Its just hard to believe, but I swear to God I telling the truth.

Then I say he's got mods he's not tellin' about.

theres no way. his is completely stock pipe and all. all he has is a dynatek(programmable) rev box. He leaves it on stock timing curve. I just dont understand it man.. All this money I have spent and still cant out run him.. However I know everyone said to run a 160 main with the mods I have, but it feels like it very boggy.. I think I going to lower the jet to a 150 main jet... I have a 25 pilot in it to. Anyone got any suggestions? I need help asap.. I got to smoke him its getting on my nerves...

Aint gonna happen...period.

oh.. its going to happen... I got alot more weight then him, but alot more mods. However I telling u the the 1 inch bigger holeshot tires are hurting me bad. ITs got to be..

Yes, you have more mods...but they are not the kind of mods that'll give your Z the kind of power that you typically need to outrun a YFZ? If your weight difference is that great and your on taller tires I'd think that your increased top end might help depending on how far you race and how well you do in the hole shot. But then again...the YFZ makes stupid power when it hits revs!

well... I talking about my buddies 07' Z400... I got to out run him first.

NAWWWWWWWWS

[Short Answer]
If you just want to outrun your buddy in a straight line on stock LTZs, you should be able to with gearing. An extra tooth on your front sprocket should give you the top speed you need over a long drag. If his quad tops out at 68 mph, and yours tops out at 72 mph......

Sure your buddy doesn't have this mod?

[Long Answer]
This past Sat. I got a call from a guy in Md. who I've been selling a bunch of parts to for the past several months. He's running a bone stock motor in his Z, jetted stock carb, aluminum airbox, and full HMF. He's been racing in a series out East that includes drags, oval track, mudbog, and MX racing. You can run any, or all of the forms of racing on the same day. You get points towards the championship awarded to the class (C, B, A, Pro) you race in. There are separate championships for the different forms (drags, MX etc.) and an overall champion determined by who ended up finishing best in all of them, over the course of the series.

So why am I making you read this longwinded post? (Sorry for that BTW)

The reason he called me was to thank me for all the parts and long distance support (I'm in Wi.) that, combined with his obviously aboundant skill, has propelled him not only into the overall series lead, but first place in each of the three classes he's running.

OK. Now what does that have to do with this thread?

He's racing against 450s. (Refer to blue type) I know some will doubt it, but dude just came home with 3 trophies, $150, and a cocky attitude he didn't have when he left the house Sat. morning.

So...what gearing is he running? That's the answer that will solve it...

My buddies bike is completely stock other then the dynotek (programmable rev box) and a k&N filter with closed lid, no jet kit pipes or anything. Man in 1st and second we run side by side and then in third he drags me at least 3 bikes and and has pulled me up to 6 bike length.. I have more weight then him and bigger tires. I just want to out run him first through 5th until I top out. Then I will shut it down.. What kinda of gearing do I need to out run him?

Hey, sorry, I was asking jjthekj for the answer for his post.

BUT, I will try to help you out. Obviously, if you have more torque, you're going to pull on him a bit. I raced my buddy on his YFZ and he SMOKED me. But, he's also about 120 soaking wet...I'm 220-230 soaking wet. SO, there's a 100 pound difference and roughly 50cc's difference. When I raced him, I was still running my stock gearing. I have since bumped down a town in the front to a 13T and it seems like it's WAY more torquey now than it was...I haven't lined'em up yet with him but I will soon. He also was running 20's and now he's running 21's...and I'm running 20's. I would say that maybe a 13T front sprocket and bumping back down to a 20 inch tire should get you rather close. You may need to go up 1 tooth in the rear sprocket as well...but if you're going to do that, I'd spend the money in supporting motor mods as well...

There's also a point where you could have too much and then him hitting higher RPM's slower may give him the advantage because the RPM's on your machine will run out really quick making you have to shift quicker and then in the higher gears making the machine accelerate a little more slowly. Example, you shift into fourth and he's still in third...him being in higher RPM's in third will allow him to pull harder than you in fourth because your RPM's will be lower...sorry if that's confusing. A smaller front sprocket will get you to the rev limiter in 5th a lot quicker though...you just won't be going AS fast.

It may take sometime, but there will be a day when you pull on him so hard he won't know what hit him...may take a couple thousand dollars to get there but it'll happen and he'll be shocked!

thanks for the help... thats exactly whats happening... when I am in 4th hes in third.. How ever my clutch is letting out at the top and I havent adjusted the fuel screw. U would happen to have a picture of where is located on the carb do u.. I did some reading on how to get it dead on. It feels boggy as hell when I hit the throttle and then it goes.. I have 160 main, 25 pilot set on the third clip.. But it just could be in my gearing like u said though...

These are your current mods that you are running & you say that your 125# friend is STILL beating you in a drag race w/ his STOCK Z w/ ONLY the Dyna CDI...correct???

Now granted...I have seen many times over the years where no 2 (or more) identical models of quads (or 3-wheelers or motorcycles) have ran the same off of the assembly line. There`s ALWAYS the exceptional one`s...that 1 out of "X amount" that just flat runs better than the other ones. I`ve gotten lucky a time or two & ended up w/ one`s like that before myself & I`d say it sounds like your buddy got lucky & got ahold of a "GOOD ONE"...but w/ that said...there`s NO WAY he got THAT D@MN LUCKY!!!...You SHOULD be beating him w/o ANY difficulty & doing so almost at will.
Your jetting should be VERY close w/ the mods you have done & I wouldn`t make any major changes to it other than maybe go up to a #165 or #170 (I was running a #170 MIKUNI Main w/ a #25 Pilot & DJ needle on 3rd clip & approx. 2 1/4-2 1/2 turns out on the fuel screw back when I still ran my stock carb w/ only a full HMF & modded lid & a cheap SRP +1,000 CDI & it ran good).
BTW...your fuel screw is located on the bottom side of the carb & on the end going towards the motor. It resides down in that approx. 1/2" high cylindrical extension that protrudes downwards & is dead center in front of the carb bowl. It`s a brass screw w/ a flathead screwdriver type of head on it. If you can`t see it down in there it`s because it`s still got the factory cap/seal covering it & you need to remove it to access the screw.
Like I said though...your friend SHOULD NOT be consistantly beating you in a drag race w/ the mods you`ve got (don`t take that the wrong way...I`m NOT sayin` that I think you`re lying about it or anything like that...I believe ya & if for no other reason than because of the simple fact that it really does seem to be pizzin` ya off that he`s still beatin` ya w/ your mods & frankly...I`d be a bit pizzed about it myself!!!).
Now, IF you go & put on an Edelbrock or an FCR & he`s STILL beatin` ya after that...the dude is FLAT OUT BULLCHITTIN` YA about not havin` SOMETHIN` done to his Z.

^^^^^^^^^^^^^^ i second that. there has to be something done to it he's not telling you if he's near stock and youre not theres something wrong there.an fcr or eddy carb will be a night and day differance on the z put one on and dont tell him lol

Are you leaving the line in 1st or 2nd? This could be the race if you are leaving in 1st and he is leaving in 2nd?

No.. we both take off in second.. However today I noticed something that has been getting worst; for one the clutch is letting out at the top. His as soon as u hit the throttle the power is there and it goes quick through the gears... However we both have the same stock sprockets on there. Well the other thing i noticed is the bike has always been hard to push. LOL I happen to get off the bike and I just tighten the chain and the AXLE I could move side to side by hand.. I made sure that it was tight and check it all the bolts and nuts are tight and it still moves. What can cause that... the sprocket is rubbing the frame... I need help on this fast... It has been making a noise since I got it down there. I just never paid it any attention.. IF it is really hard to push like that it could be dragging the bike down alot I would think... Please help?? thanks

replace youre rear carrier bearings sounds like they are blown out

Yep, rear carrier bearings...

Any chance that his clutch is also bad and that he's just plain not hookin' up?

to be honest with u I am going to fix the carrier bearings and put on my 13t frony sprocket and give it another shot and maybe install a better clutch maybe.. IF I cant out run him I will probably be selling mine to get a YFZ450 that I know will eat his ass up...

I doubt that, because we both have about the same experence man...