Here you guys go!
2010 CRF250
Base: 35mm passive piston
21-32.1
30.1
28.1
26.1
24.1
22.1
20.1
18.1
16.1
8-14.2
Base Plate: 20mm x 1.65mm
4-12.2
Mid 23.5mm active piston
Comp
3-20.1
18.1
16.1
14.1
12.1
11.1
2-11.3
2-17.3
Reb
4-20.1
12.1
20.1
18.1
16.1
14.1
2.12.2
12.5mm Damping Rod
5.44mm spacer mid comp
.30mm Float
Fork Spring: 462mm length
O.D. 43.6mm
.45 kg/mm
342cc oil
KYB style floating piston
KYB style spring perch
2010 CRF 250 Stock Fork Specs
Started by
yam259
, Sep 26 2009 03:33 PM
95 replies to this topic
Posted 26 September 2009 - 03:46 PM
Nice thanks.
Very Yamaha'ish. The stock fork springs are .44's though.
These forks really respond well to stiffer springs. The front rides higher and gets plusher.
These are great forks(after stiffer springs) and now I see a good valving spec that should work well for most riders.
Very Yamaha'ish. The stock fork springs are .44's though.
These forks really respond well to stiffer springs. The front rides higher and gets plusher.
These are great forks(after stiffer springs) and now I see a good valving spec that should work well for most riders.
Posted 26 September 2009 - 04:13 PM
Nope, Had them rate tested today. One was .448 and the other was .451.
At least mine are.
Thanks!!!
At least mine are.
Thanks!!!
Posted 26 September 2009 - 04:20 PM
yam259 said:
Nope, Had them rate tested today. One was .448 and the other was .451.
At least mine are.
Thanks!!!
At least mine are.
Thanks!!!
We did measure in kg/mm. I quess if you used N/mm they would be 4.4 N/mm.
Posted 26 September 2009 - 08:36 PM
yam259 said:
We did measure in kg/mm. I quess if you used N/mm they would be 4.4 N/mm.
Yes 4.4 N/mm, I see they convert to the same........
Posted 27 September 2009 - 05:38 AM
Here is the shock!!
Comp:
2-44.25
11-44.2
37.15
23.15
44.25
42.25
40.25
38.25
36.25
34.25
32.25
30.25
28.25
26.25
24.25
23.3
3-25.3
2-25.6
Reb:
4-40.2
25.1
40.3
38.3
36.3
34.3
32.3
30.3
28.3
27.3
26.2
Spring:
268mm length
87mm and 89mm O.D.
Comp:
2-44.25
11-44.2
37.15
23.15
44.25
42.25
40.25
38.25
36.25
34.25
32.25
30.25
28.25
26.25
24.25
23.3
3-25.3
2-25.6
Reb:
4-40.2
25.1
40.3
38.3
36.3
34.3
32.3
30.3
28.3
27.3
26.2
Spring:
268mm length
87mm and 89mm O.D.
Posted 27 September 2009 - 05:50 AM
mog said:
thats scary close to a kyb...
And it works well......
Thanks again Yam 259......
For me at 200lbs even after the right spring the shock is a little soft. It needs a bit more LS rebound so a few more 40.2's. Then on compression? The 23.15 cross needs to be closer to a 28 or 30, and .1's vs .15's for both crosses might be a good idea? humm? maybe leave the .15's for the first test and go with a 30.15. and change the some of the .25's coming up from the clamp to .3's and it should be good test shock......
Posted 27 September 2009 - 06:13 AM
455 said:
And it works well......
Thanks again Yam 259......
Thanks again Yam 259......
I really have only rode it for and hour or so. I was taking is apart to change fluids and make sure everything was correctly bled(it was by the way).
My first impression is the same as my 450 was, just not to such extremes. The front is softer than the rear and the rear rides a little high. I had to get down to 110mm sag to feel level. The rear still felt high going in to corner (or is the front riding low?
) My first thought is to leave the front alone and soften comp on shock a little. Maybe add a 40.2 to the reb and try a 3mm spacer. My spring spec'd out to a 5.2 kg/mm. I may try a 5.0 to get my sag and free sag #'s a little closer.I seem to ride over the front alot. I am 150lbs and I tend to like a softer rear shock. On the hard pack chop I ride in the back had a spikey feel. Front felt good though.
Posted 27 September 2009 - 07:05 AM
This is the first I have seen the specs on the 2010 CRF 250. Just from looking at them I would probably pull 6 of the 32's out of the forks. Add 1 or 2 20's on the compression side of the midvalve. Keep stock float. Start out on the low side of the fork oil and go from there. Shock stay with the .15 on the crossover. I would try a .36 & .34 or go with a .38 & .30. Take out some LSC. Probably going to end up with 9 or 10 .40's on the LSR to get it to work right. This is probably what I would start out with. Just my two cents worth.
Posted 27 September 2009 - 07:21 AM
yam259 said:
. I may try a 5.0 to get my sag and free sag #'s a little closer.
I seem to ride over the front alot. I am 150lbs and I tend to like a softer rear shock. On the hard pack chop I ride in the back had a spikey feel. Front felt good though.
I seem to ride over the front alot. I am 150lbs and I tend to like a softer rear shock. On the hard pack chop I ride in the back had a spikey feel. Front felt good though.
For 150lbs a 5.0 will help for sure, the stock rear spring is stiff for your weight and will add spikes to the square edge.
Stock fork springs should be close for you.
Posted 27 September 2009 - 07:24 AM
mog said:
seems weird the shock feel soft? does it have a 18mm shaft now?
I think you would like it with a softer spring........nope it has the 16mm shaft.
Posted 27 September 2009 - 07:27 AM
Old MX fart said:
Probably going to end up with 9 or 10 .40's on the LSR to get it to work right. :
I wouldnt go past 6 even for a heavy rider with a stiff spring.
Posted 27 September 2009 - 07:57 AM
yam259 said:
I seem to ride over the front alot. I am 150lbs and I tend to like a softer rear shock. On the hard pack chop I ride in the back had a spikey feel. Front felt good though.
Along with a softer spring you could try remove those 2 44.25's from compression and leave the rest of the stack alone. That might be all you need?
Posted 27 September 2009 - 08:38 AM
455 said:
I wouldnt go past 6 even for a heavy rider with a stiff spring.
I always seem to end up with 6 to 7 on the 450's. 9 to 10 on the 250's. I always use FC compression adjuster springs too. I'm in Ohio really works well up here.
Posted 27 September 2009 - 10:30 AM
Old MX fart said:
I always seem to end up with 6 to 7 on the 450's. 9 to 10 on the 250's. I always use FC compression adjuster springs too. I'm in Ohio really works well up here.
If it works for you great.
But it does make me think why so much LSR? Are you setting up your shocks so soft that you need that much?I have tested the FC adjuster springs, they really soften up the shock so I don't use them, good for woods guys or a quick bandaid for overly stiff valving.
Posted 27 September 2009 - 02:30 PM
455 said:
If it works for you great. But it does make me think why so much LSR? Are you setting up your shocks so soft that you need that much?
I have tested the FC adjuster springs, they really soften up the shock so I don't use them, good for woods guys or a quick bandaid for overly stiff valving.
But it does make me think why so much LSR? Are you setting up your shocks so soft that you need that much?I have tested the FC adjuster springs, they really soften up the shock so I don't use them, good for woods guys or a quick bandaid for overly stiff valving.
Thats a good point 455 ! I like to soften up the shock so when you blast through a big set of whoops it uses all of the travel without bottoming. Or using all the travel flat landing a big jump. Not to the point where the tire hits the rear fender. If you make a mistake and over jump a really big jump and the tire slight rubs the fender you know your pretty close. They will come out of a corner better too. That would make sense compensating with more rebound. All I know is that it works !
