Which fork oil for '00 YZ 250?

sigar

Subscriber
Joined
May 10, 2000
Messages
152
Likes
0
#1
I'm about to change the fork oil in my '00 YZ250. What oil should I use? This is the first time that I'll be changing fork oil, I plan to pretty much take the forks completely apart and see what the hell they look like. I'm beginning to enjoy working on my bike more than riding it. What tips do you have for this, any special tools you suggest? Thanks.
 

John Curea

Lifetime Sponsor
Joined
Feb 29, 2000
Messages
177
Likes
0
#4
Check out Ebay, they have a 46mm seal driver on the auction right now going for 26.00. Item #454618691. I bought the same brand new driver from this seller for 31.00 ( about half price). He must have quite a few , because he has been selling them for a while now.
Good Luck, John Curea
 
Joined
Oct 4, 2000
Messages
317
Likes
0
#5
The correct fork oii is KYB 01 oil, set the oil height to 125mm from the top, with out the fork spring, with the fork fully compressed, Depending on your weight, and rider ablity, I ran .44kg springs with the oil height at 128mm, I also changed the rear spring from a 4.8 to 5.0kg.

See ya Coop
 

Jeremy Wilkey

Owner, MX-Tech
Joined
Jan 28, 2000
Messages
1,453
Likes
0
#6
Coop,
KYB 01? @ 125mm Why 125mm? Try more like 105-110 at the lowest.... I would also not waste your time and money with KYB 01... That fork is so soft I can't see why 125 or 128 would be good.

Jer
 
Joined
Oct 4, 2000
Messages
317
Likes
0
#11
Hello, earth to jer ??? std oil level is 135mm, that is to soft, that is why we go with 128mm," depending on rider " I ran .44kg springs at 128-130mm, work real good, trust me kyb 01 is the best oil to use, there is cheeper, but it is just that CHEEP !!.. I have tested pj1 01, and race tech very light, and all spectro oils, none work as well as kyb 01, trust me I have done a few of these forks.. If you are running 105mm, you need stiffer springs, or your springs are clapped out ?? that is way to much oil for a 2000 yz 250, that might be a good level for a 99 maybe, ( they dont have the bumpers in the fork, so they take more oil )?

See ya Coop
 
Joined
Apr 19, 2000
Messages
456
Likes
1
#12
What DO the 99's have in the forks Coop? Jeeeeeeer, I thought they did. And I thought the 98's did too. Hmmmm...... Guess what Coop. My 00YZ250 doesn't have any bumpers in them, I just went and looked. In fact I found them sitting in my service trailer. They are almost in the trash can. You want them?
 

Jeremy Wilkey

Owner, MX-Tech
Joined
Jan 28, 2000
Messages
1,453
Likes
0
#13
Coop,
Hey man I was not tryingh to slam you, but I would be careful. I get really werid when people make recomendations, and they don't seem to be able to back them up. What works for is great! But when telling other people what to do you had better know what your talking about.. I just wanted you to defend your comments. I like to poke at people and see what they really know.. I was a teacher once, still am I supose and it's just part of fleshing out what we understand. I use this forum as a way to flex my brain..I'm chaleanged to talk about things that I understand more interms of variables than something concrete. Unfortunatley for you I don't agree with your YZ recomendations so I wanted you to elborate, maybe to help me see where you are comming from..

There are some sharp people on this board and as long as you can back it up with your ideas your fine. We are here to learn..

Now that being said What kind of oil reasaech did you do? I have done some myself..and I suspect that I'm not much for being called "cheap".. Quite the oposite infact... So I'll let the gloves fall on this one.. Got anything good.. I love a good debate..

Regards,
Jer
 
Joined
Oct 4, 2000
Messages
317
Likes
0
#14
Jer. I am not coming on here to argue with any body, But I did miss the year, I meant 97 yz250, 98-2001 all have bottoming rubber.
The oil I have tested has all been seat of the pants testing, riding and setting up new YZ's & RM's for the past 20 yrs, The oil height you gave is for 97 and older, as I have never ran 100mm of oil in the 98-2001 forks, doesnt mean you cant run that height though, just means if I ran any height more than 120 the forks fell real harsh, ?
as for oil's the pj1 01 seemed to foam up, and I had to blead the forks more often. samr with the rest of the oils, the kyb 01 didnt foam no were near as bad. That is my test, What are your test's you have done !!

See ya Coop
 

Jeremy Wilkey

Owner, MX-Tech
Joined
Jan 28, 2000
Messages
1,453
Likes
0
#15
Coop,
Lots of checical analysis and feild testing. It is my job and all.. (Blantent tongue in check hummor) I wonder what you think actually might cause the fork to be harsh with 10-20mm higher oil.. Also how does the bummper fork have a different oil ht. Does it take up more volume? What are you going to do with the RM's with balder forks.. You do know what oil to set those at? Man is that not going to be real harsh or what? Just some food for thought..

You see a air spring is not going to really cause harshness.. Valving does.. It's speed sensitve not postion sensitive.

Jer