Does anyone know the individual gear ratios inside the transmission for the Yamaha WR 450, both the quad versions and the bike versions? Also primary and secondary gear reductions if any and what their ratios they are?
jason
Does anyone know the individual gear ratios inside the transmission for the Yamaha WR 450, both the quad versions and the bike versions? Also primary and secondary gear reductions if any and what their ratios they are?
jason
Does anyone know the individual gear ratios inside the transmission for the Yamaha WR 450, both the quad versions and the bike versions? Also primary and secondary gear reductions if any and what their ratios they are?
jason
Jason
CalPoly SLO
Will advise when we get back to Melbourne next week.
Cheers
Geoff Pearson
RMIT FSAE 02-04
Monash FSAE 05
RMIT FSAE 06-07
Design it. Build it. Break it.
This seems to have the info required:
http://yz450f.yme.com/pages/default.htm
Ben
-
Here's the spec's from that site.
Type
Liquid cooled, 4-stroke, single cylinder, DOHC 5 valves
Displacement 449 cm3
Bore and Stroke 95.0 x 63.4 mm
Compression ratio 12.5:1
Max. Power N.A.
Max. Torque N.A.
Lubrication Dry sump
Fuel supply Carburettor (FCR39H)
Clutch type Wet, multiple disc
Ignition C.D.I.
Starting system Kick
Transmission Constant mesh, 4 speed
Final transmission Chain
Gear ratio 1 1.929
Gear ratio 2 1.563
Gear ratio 3 1.278
Gear ratio 4 1.05
Primary reduction ratio 2.818
Secundary reduction ratio 3.357
Um...there's one really important thing that this engine seems to be lacking. Anybody?
Maybe the quad version has it?
UNM FSAE 2003 to 2005
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Um...there's one really important thing that this engine seems to be lacking. Anybody?
<HR></BLOCKQUOTE>
If you're talking about an electric starter, the wr450f engine has it, but the yz450f does not. The wr450f also has a 5th gear.
The WR electric start bolts onto the YZ engine, from what I can see, but you need the WR rotor cover casing and a few gears and stuff - could be quite expensive.
The WR450 is a five speed, and I think the YFZ450 ATV is as well, but from the parts listings I have they are different gear ratios. I'll check all this when I get home, probably Monday next week.
Cheers all
Geoff Pearson
RMIT FSAE 02-04
Monash FSAE 05
RMIT FSAE 06-07
Design it. Build it. Break it.
Anyone got a dyno chart for it? I looked around on the net a bit and couldn't find one.
-Mike Waggoner
The older I get, the faster/harder working I was...
Here's a "half throttle" run off this website:
http://www.cyclecost.com/shopping/po...r_now_dyno.htm
You could scale it up to whatever you expect the peak power to be. YMMV
Also, it's a CRF 450, I don't have a clue how that compares to the WR450.
Alumni, University of Washington
Structural / Mechanical Engineer, Blue Origin
Wasn't somebody getting ~70 hp out one of these engines...seems like a great hp/weight ratio!
How much do these weigh? I think the F4i weighs in at 120lbs, can't remember if this was wet or dry. Anybody got a torque curve to share?
Also, Is the WR450 a dirt bike?
UNM FSAE 2003 to 2005