450 HP Numbers


73 replies to this topic
  • FFRacing79

Posted September 08, 2005 - 06:49 AM

#21

How soon you guys forget!!
Tdub's YZ450F

  • B86_Racer

Posted September 08, 2005 - 11:47 AM

#22

I didn't forget... :banghead:

I knew that you and burned both had 60hp 450's...


Going to try and get those files to you asap burned.

  • zane5219

Posted September 08, 2005 - 02:50 PM

#23

I think stock is like 48-49 horse, all you did was put on a pipe, run u4 and jet it properly? Gainnig 7 to 8hp is a nice pick up. :banghead:

stock is 58 hp @ 9000 rpm, according to the factory specs...

  • OHVrider

Posted September 08, 2005 - 03:06 PM

#24

I had my 03 YZ450F dyno'd twice to jet it and it got 48 both times and both times the guys dong it said that they were seeing about 46-48 on the YZF's. My KTM 525EXC got 46 on one of dyno's and my old 2000 Husky TE610 got 34 stock and 70 after $2,500 in engine mods. Too much power for me, and the guy I sold it too shattered the rear hub practicing for the V2R in sixth. The compression on that beast was around 12.5:1, I think stock was 9.?:1 and at about 240 pounds I could stand on it and it would not budge. Started great with a big hill.

I think most of you guys worrty too much about HP. Spend the money on some Enzo or RG3 suspension and I bet your faster than adding HP.

It took me a long time to learn that lesson, now suspension is first, second and maybe third on the list.

Cheers,

  • grayracer513

Posted September 08, 2005 - 05:35 PM

#25

stock is 58 hp @ 9000 rpm, according to the factory specs...

That is crank horsepower, not rear wheel. A good stocker is 47-48.5. Most AM pipes are good for .5-1.5 hp, and U4 can get you another 1-1.5, maybe 2. 51 would be believable.

  • zane5219

Posted September 09, 2005 - 02:00 PM

#26

what's the diff in power between a 400 and 426 and 450?

  • grayracer513

Posted September 09, 2005 - 03:30 PM

#27

Roughly 2 for each step. 44, 46, & 48 more or less approximately estimating.

  • phat_450f

Posted September 09, 2005 - 03:42 PM

#28

damn man who cares its fast and thats all that matter's...

  • GENE426

Posted September 09, 2005 - 04:41 PM

#29

a aftermarket pipe made all the diff in the world on my yz450-04
i mean it was slow as far as a 450 goes until i put the fmf ti muffler and powerbomb header
huge diff

  • FFRacing79

Posted September 09, 2005 - 06:19 PM

#30

a aftermarket pipe made all the diff in the world on my yz450-04
i mean it was slow as far as a 450 goes until i put the fmf ti muffler and powerbomb header
huge diff


I wouldn't consider 1 to 1.5 hp difference huge. Tdub

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  • GENE426

Posted September 09, 2005 - 08:16 PM

#31

I wouldn't consider 1 to 1.5 hp difference huge. Tdub


ITS NOT THE HP ITS HOW IT MAKES THE BIKE RUN
ALL THE BIKES POWER IS SMOOTHED OUT AND ALWAYS THERE
YA GET RID OF THE DEAD AREAS AND IT CAN RUN MUCH BETTER
PLUS I THINK ITS LIKE 3 HP JUST TRY IT..............................
:banghead: :applause: :lol: :lol:

  • grayracer513

Posted September 10, 2005 - 10:15 AM

#32

The FMF system is excellent, and it does take the sag/hit thing out of the middle of the curve compared to stock, and flattens the curve out, extending both ends a little, giving much wider, smoother power delivery, but it's still only good for 1 over stock at peak.

The way the big gains that FMF shows on their web site are achieved is by making no effort whatever to optimize the stocker, while the bike is thoroughly rejetted to run the new exhaust.

The better mag "shootouts" try to get the bike running right for both readings.

  • GENE426

Posted September 10, 2005 - 05:20 PM

#33

The FMF system is excellent, and it does take the sag/hit thing out of the middle of the curve compared to stock, and flattens the curve out, extending both ends a little, giving much wider, smoother power delivery, but it's still only good for 1 over stock at peak.

The way the big gains that FMF shows on their web site are achieved is by making no effort whatever to optimize the stocker, while the bike is thoroughly rejetted to run the new exhaust.

The better mag "shootouts" try to get the bike running right for both readings.


never said how much hp but it did manke a big diff in preformance!
got it cheap too so i have no complaints with no jetting change

Would jetting make a big diff?

  • grayracer513

Posted September 10, 2005 - 06:05 PM

#34

never said how much hp but it did manke a big diff in preformance!

Sorry,

PLUS I THINK ITS LIKE 3 HP JUST TRY IT................

I guess I misunderstood.

Would jetting make a big diff?

It can, yes, depending on how close to right the stock jetting is for that pipe where you ride.

  • GENE426

Posted September 10, 2005 - 09:59 PM

#35

Sorry,
I guess I misunderstood.

It can, yes, depending on how close to right the stock jetting is for that pipe where you ride.


well 1.5 -3 whats the diff
i saw the 3hp on fmf web and another guy had said that all i know is the bike runs much better with it new pipe

  • YZDAD1

Posted September 11, 2005 - 05:00 AM

#36

2003 YZ450F:

High Compression JE Piston
Ported Head
Hot Cams
Jardine Ti System
Tuned Carb
Modified Airbox

This MX bike put out slightly over 53 RWHP, does'nt sound like much :banghead: ? But, you know what? It was usually the first bike to the first turn and was never passed on a straitaway with a 300+ lb. rider! :lol:

btw: The complete bike or motor is for sale! :applause:

  • B86_Racer

Posted September 15, 2005 - 11:34 AM

#37

Burned-
Did you ever get the dyno file that I sent you? I sent a 2nd one that wasn't zipped.

  • ttr125smms120

Posted September 15, 2005 - 11:41 AM

#38

i HEARD that last year tim ferry had a 70 HP 3 speed yz450f, but it could be a lie

  • grayracer513

Posted September 15, 2005 - 02:36 PM

#39

well 1.5 -3 whats the diff

Roughly 100%

i HEARD that last year tim ferry had a 70 HP 3 speed yz450f, but it could be a lie

Yes, I suppose it could at that. :banghead:

It was a 3 speed, though.

  • ttr125smms120

Posted September 15, 2005 - 03:03 PM

#40

Roughly 100%
Yes, I suppose it could at that. :applause:

It was a 3 speed, though.


i dont see the problem with a 3 speed for racing. with 70 horsepower i think you could start in 3rd, and keep it there for the race. unless im missing something :banghead:





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