Dyno testing WR450 2005

4 replies to this topic
  • tmckeown

Posted December 12, 2005 - 12:58 PM



Finally went to dyno with my bike to get jetting right for winter to come.

Yamaha WR450
Twinair airfilter and gage
Akropovitch slip-on

Main jet: #168
Needle: DUS-K
Fuel screw: 1 3/4 open
Slow jet: #52


39KW at 8300 rpm
50Nm at 6880 rpm

Disconnected gray wire from CDI

40Kw at 8300 rpm
51Nm at 6880 rpm

Then tested slip-on with noise damper (96Db), only noticeable change was that with noise-damper it had bit more power and torque below 6000 rpm.

Timo Mc

  • hankdog

Posted December 12, 2005 - 03:16 PM


For all us non-Euros out there: :applause:

Kw x 1.341 = HP
Nm x .7376 = Ft Lb (torque)
39Kw = 52.3 HP
50Nm = 36.88 Ft. Lb.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • JSanfilippo

Posted December 12, 2005 - 05:37 PM


Wow 52.3 Hp with a trail bike!!! Thats insane

  • ncampion

Posted December 12, 2005 - 06:43 PM


Peak HP at 8300 RPM - somehow I thought it would peak at a higher RPM.

  • tmckeown

Posted December 13, 2005 - 07:01 AM



it is over 39 Kw from 7300 to 9200 rpm

Timo Mc


Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.