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2007 crf250r/crf450r valve stack comparison.

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Wondering if anybody had the correct OEM valve stack for both 2007 CRF's, both shock and forks? I did find what looks to be the correct stack for the 250r but nothing yet on the 450r. My son has an 07 CRF250r and my brother has CRF450r but my brother really likes the feel of the suspension on my sons 250r. I realize that the spring rate is lighter on the 250r and that is the first thing we are going to change being my brother is around 165 #'s but would like to compare stacks too.

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I don't have the specs in front of me but if memory serves me correctly, the fork valving is almost identical. Pressure springs are a little lighter (1.9 vs 2.1) main springs are lighter(.45 vs 47). I think the main bleed hole in the compression bolt is larger as well. But the valving is quite a bit softer in the shock, along with a softer spring of course. (5.3 vs 5.5kg) The high speed compression valving is pretty close between them, but the low speed is way softer. I've always felt that the valving was a bit stout on the 450s, in spite of what te magazines say.

 

To answer your question on the actual valving, I'll try to go by memory

 

Fork:

 

16) 10x30

1)   10x28

1)   10x30

1)    10x29

1)   10x28

1)   10x27

1)   10x26

1)   10x25

1)   10x24

1)   10x23

1)   10x22

1)   10x21

1)   10x20

1)    10x19

1)    10x18

1)   10x17

1)   10x16

 

Bleed valving:

 

10) 10x16

1)   10x15

1)   10x14

1)   10x13

1)   10x12

1)   10x11

1)  20x10

 

I don't remember the rebound

 

Shock:

 

9) 20x44

9) 15x44

1)  15x37

1)  15x30

2) 20x42

1) 25x40

1) 25x38

1) 30x36

1) 30x34

1) 30x32

1) 30x30

1) 30x29

1) 30x28

1) 30x27

1) 30x26

1) 30x25

1) 30x24

1) 30x23

1) 30x22

 

Rebound:

 

2) 20x40

1) 10x27

1) 30x40

1) 30x38

1) 30x36

1) 30x34

1) 30x32

1) 30x31

1) 30x30

1) 30x29

1) 30x28

1) 30x27

1) 30x26

 

I hope this helps a little

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That's a good starting point, thank you.

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If I remember when I get into the shop today, I'll check and see how accurate my memory is.

 

Update:

 

I was close. On the fork compression the clamping shim is a .10x18, no 17 or 16

 

The by pass valving has 9  .10x16, not 10, and the last shim is a .20x11, not .20x10

 

Rebound is:

 

2) .10x20

1) .10x18

1) .10x12

1) .10x16

1) .10x15

1) .10x14

1) .10x13

1) .10x12

1) .20x11

 

Mid valve:     all IDs are 8mm except for slide collar

 

6) .10x20

4) .10x17

1)  2.25x8  collar

1) .20x9.45

2) .20x10

 

The rear shock was correct except it had a .10x25 crossover on rebound, not a .10x27

Edited by HONDA65

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If I remember when I get into the shop today, I'll check and see how accurate my memory is.

 

Update:

 

I was close. On the fork compression the clamping shim is a .10x18, no 17 or 16

 

The by pass valving has 9  .10x16, not 10, and the last shim is a .20x11, not .20x10

 

Rebound is:

 

2) .10x20

1) .10x18

1) .10x12

1) .10x16

1) .10x15

1) .10x14

1) .10x13

1) .10x12

1) .20x11

 

Mid valve:     all IDs are 8mm except for slide collar

 

6) .10x20

4) .10x17

1)  2.25x8  collar

1) .20x9.45

2) .20x10

 

The rear shock was correct except it had a .10x25 crossover on rebound, not a .10x27

Thanks!!!

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