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TeamEndo

'06 YZ450F 5spd gearing

7 posts in this topic

Ok, here are the tranny ratios for the new 5spd for those who are curious.

Primary reduction ratio- 61/23 (2.652)

1st- 27/14 (1.929)

2nd- 23/15 (1.533)

3rd- 23/18 (1.278)

4th- 24/22 (1.091)

5th- 20/22 (0.952)

sprockets: countershaft 13, 49 rear.

After riding it all weekend i never touched 5th gear, didn't need it, fourth pulls HARD seemingly forever...can't wait to get this thing in the desert.. :applause:

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Gear Final Drive Difference

2006 YZ 450 Gear ratios Ratios Ratio Between

Primary reduction ratio- 61/23 2.652

1st- 27/14 1.929 8.35

2nd- 23/15 1.533 7.95 0.40

3rd- 23/18 1.278 7.70 0.26

4th- 24/22 1.091 7.51 0.19

5th- 20/22 0.952 7.37 0.14

sprockets: countershaft 13/49 rear. 3.769

2005 YZ 450

Primary reduction ratio- 61/23 2.652

First 27/14 1.929 8.22

Second 25/16 1.563 7.86 0.37

Third 23/18 1.278 7.57 0.28

4th. 21/20 1.05 7.35 0.23

sprockets: countershaft 14/51 rear. 3.643

The gear ratios are considerably closer than the 2005 model, I like it.

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Thanks for the info!

Looks like the primary and final gearing changes are almost a wash.

So 1st-3rd is almost the same as the 4 speed, the only diff. being the primary and final ratios (actually 2nd is taller on the '06 by a few %), the net effect is the new bike is geared slightly lower 1st-3rd, due mostly to the lower net gearing of the combined primary/final ratios, but w/ a smaller 2nd-3rd gap (and larger 1st-2nd).

4th gear is the old 426 ratio (24/22), but w/ the diff. primary/final combo is about 6% slower than the 450 (note: primary ratio changed in '05, I'm using '04 spec), which was taller than the 426.

So in 4th, about 5 mph slower, but about 8 mph faster overall, than the 4 spd.

:applause:

Pending any math errors......

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Looks right. The trans is gear for gear the same as the YZ426 ratios were except for the 1.94 1st gear (the 426 had a 1.85). It's pretty much what I had been hoping to see, really. This way the gearing gaps are about the same, subject to the overall gearing, as the 4 speed, with an extra gear tossed on top of the pile. I see a top of 95 (on paper) at the rev limit with stock gearing. :applause:

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Nice info on gearing. Looks like I am fine with my 03'yz450 since my riding areas never allow me to open er' up past 3rd gear pinned.:applause:

I was curious as to what everyone's manual says for basic weight of the 04',05'&06' yz450 models? My 03' has 249lbs basic weight(bike with all fluids in it). thanks

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The trans is gear for gear the same as the YZ426 ratios were except for the 1.94 1st gear (the 426 had a 1.85).

Dang, I didn't even notice that.

The primary/final net change from the 426 to the new 5 speed is less than 3%.

Sort of makes the 4 speed look like a stop-gap solution. :applause:

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