KDX250SR Fork Oil

[RFJ_His_Son]

Anyone know what weight and amount of fork oil goes into a 1991 250SR? Upside down forks.
Thanks

 

[KiDX]

I think it's 5W, but you can replace it with whatever weight you choose ;)

 

[Kamofly]

I used the heavy 15w & filled the tubes aprox.1/2 full or a little under.
The more oil u use the "stiffer" the forks get.the only reason i used the heavyer weight, was because i had a slight oil leak.
these forks are far better than the standard factory forks of other KDX's + u can do alot of easy tunning (my opinion)

"91 KDX 250
'98 KDX 200

 

[RFJ_His_Son]

thanks Kamofly, I think I'll try what you suggest. Should allow for some good rebound damping with thicker oil too, eh?

 

[Matt90GT]

Thicker oil will slow the forks down. Thinner does the opposite.

Everything I have read and seen suggest to use 5w oil. I had 10 after new seals and the forks felt pretty stiff on the rebound. So 5 went in. Worked great on the limited trails I saw this last weekend.

 

[RFJ_His_Son]

ok, I'm mainly riding in tight woods, rutted up bad, with lots of treeroots and stuff, so I want smooooth rebound.
light oil or heavy oil, lots or little.
Please don't get all technical on me, I just get on the bike and ride it. If the fork seals weren't leaking I would leave it just how it is, except grind some of the lockstop away to get some more turning from it, it's like an oil tanker to turn at the moment in real tight stuff, I'm better off getting off and lifting it round! hehehehehee

 

[Matt90GT]

5w oil

With the springs out, fork compressed fill 5" from the top.

 

[Kamofly]

I like the 15w because of it's ability to soak up the hard landings
---i.e. nose diving--- It never bottoms out! Allthough for your condition I would go with 5w unless you plan on doing some mx.

 

[Kamofly]

Since we're on the subject,......Is there a tool, or special format to draining / adding oil to rider skill level , Wieght , terrain , oil wieght,etc
I would love to have a softer ride over the light stuff----crusingspeed.

 

[Matt90GT]

scroll down to the bottom of this page for some links on how to setup the suspension:

http://www.motocross.com/motoprof/moto/mcycle/suspen.html

 

[Kamofly]

cool link GT!! Thanks.
Does anyone run 15w fork oil in thier inverted fork?