serious WR mods


13 replies to this topic
  • o-lad

Posted August 27, 2009 - 04:31 AM

#1

i am in just purely curious as to what power i can expect from a fairly heavily moddded 2008 wr450f as i am interested in purchasing one for supermoto.
so i guess what real life hp numbers can i expect from things like a hc piston cams and a little head work and an exhaust?

anyone know the actual figures hp wise of a stock unrestricted wr450f??

  • ww44wrf450f

Posted August 27, 2009 - 04:48 AM

#2

i am in just purely curious as to what power i can expect from a fairly heavily moddded 2008 wr450f as i am interested in purchasing one for supermoto.
so i guess what real life hp numbers can i expect from things like a hc piston cams and a little head work and an exhaust?

anyone know the actual figures hp wise of a stock unrestricted wr450f??


upper 50's

  • o-lad

Posted August 27, 2009 - 05:11 AM

#3

thats stockish unrestricted im guessing?

  • rkwfxd1

Posted August 27, 2009 - 05:36 AM

#4

Stockish unrestricted is around 40hp I believe.

Dirt bike just modded one with exhaust cam and head work by LA Sleeve and I think a HC piston and they were at 50ish hp I believe.

I THINK that if the motor was really built with all the tricks like overbore, head and valve work, both cams, proper jetting, open exhaust etc... one could get 60ish hp.

  • klossWR450

Posted August 27, 2009 - 07:06 AM

#5

from an old thread, fully breathing WR with stock engine - 50bhp at the back wheel http://www.thumperta...ad.php?t=561830

  • William1

Posted August 27, 2009 - 07:06 AM

#6

I seem to recall stockish is about 50Hp. Do a search, I am sure there are a feew dyno graphs about and the bike specs for the runs.

  • William1

Posted August 27, 2009 - 07:07 AM

#7

Stockish unrestricted is around 40hp I believe.

Dirt bike just modded one with exhaust cam and head work by LA Sleeve and I think a HC piston and they were at 50ish hp I believe.

I THINK that if the motor was really built with all the tricks like overbore, head and valve work, both cams, proper jetting, open exhaust etc... one could get 60ish hp.


A DRZ 400 is 39 Hp at the RW.......

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  • ww44wrf450f

Posted August 27, 2009 - 06:24 PM

#8

I was thinking upper 50's modded with a cam, hc piston and p.p. ? How about some nitrous? Anybody heard from the thread about the turbo-ed 450?

  • tribalbc

Posted August 27, 2009 - 07:12 PM

#9

The Sept dirt bike has an article claiming a stock YZ450 at 49hp. They say Valli MX team bikes with piston, cams, headwork, vortex ignition and bored carb at 59.9hp.
Our performance machine shop here in BC claims a 4-5hp peak gain on my WR with no loss of bottom or mid with porting.

  • Bamster

Posted August 30, 2009 - 11:10 AM

#10

A DRZ 400 is 39 Hp at the RW.......


The suzuki sure hides it well.
I would have thought about 34.

  • Krannie McKranface

Posted August 30, 2009 - 08:11 PM

#11

The suzuki sure hides it well.
I would have thought about 34.


..hmmm


35 / 287lbs = .12 drz
48 / 265lbs = .18 wr
54 / 240lbs = .23 yzf
57 / 239lbs = .238 cr500af
59 / 219lbs = .269 modified Maico 501
31 / 174lbs = .22 1972 RH72 factory Suzuki (yes, 174 lbs)
42 / 189lbs = .22 1972 RN72

  • erickdj

Posted August 31, 2009 - 10:23 AM

#12

..hmmm


35 / 287lbs = .12 drz
48 / 265lbs = .18 wr
54 / 240lbs = .23 yzf
57 / 239lbs = .238 cr500af
59 / 219lbs = .269 modified Maico 501
31 / 174lbs = .22 1972 RH72 factory Suzuki (yes, 174 lbs)
42 / 189lbs = .22 1972 RN72


Awesome ratio for the yzf! Glad I have one.:ride:

  • SXP

Posted August 31, 2009 - 12:49 PM

#13

..hmmm


35 / 287lbs = .12 drz
48 / 265lbs = .18 wr
54 / 240lbs = .23 yzf
57 / 239lbs = .238 cr500af
59 / 219lbs = .269 modified Maico 501
31 / 174lbs = .22 1972 RH72 factory Suzuki (yes, 174 lbs)
42 / 189lbs = .22 1972 RN72


31/174 = 0.178.

You know someone was going to check:smirk:

  • Krannie McKranface

Posted August 31, 2009 - 01:05 PM

#14

31/174 = 0.178.

You know someone was going to check:smirk:


..........ooops............




 
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