KDXRIDER.NET

Hi, seems difficult to get used xr 400 for spring lately off ebay. bikebandit prices is a bit pricey as well buying a used kx 125 fork.

anyone tried FRP fork spring yet? any comment feedbacks on them?

Does Progressive Suspension make springs for the KDX? I've used their springs twice and I've been very happy both times.

Sorry, I don't have any info on Fredette's springs.

I just got a set of XR250 springs off ebay for $1 plus shipping.
The XR250 and XR400 shares the same size forks and frame

Racetech specs this XR250 stock spring as .398 kg/mm which should be
right about what I need for my weight (~190lbs with gear and hyd pack ).
It should still be a reasonably nice ride. The stock shock spring should be good for me. I'm a 35 year old trail rider not a racer...

The XR400 has a softer .382 kg/mm spring which would be OK for a slightly lighter rider, but you'll need a softer shock spring too.

Try the XR250 springs if you still have trouble finding 400 springs. Honda probably made alot more XR250s than XR400s also.

Xr600 93-00 : .41
Xr600 85-92 : .42
Xr650L 93-02: .44
Xr400 00-02 : .40
Xr400 96-99 : .38

It’s the 1996-99 0.38kg/mm XR400 springs that are interchangeable and commonly used in 1995 to 2005 KDX200/220s

The stock 1995 to 2005 KDX 200/220's springs are commonly used to replace the 1989 to 1992 KDX springs, they are a good fit and give much more support in these models.

The Stock KDX spring rate depends on the year of the KDX. The 89-92 KDX's had a .29 spring rate stock. The 95-04 KDX's have a .35 spring rate.

If you have the older KDX200s like the 93-94s with the 41mm forks, you may be able to use the springs from the Xr250s. Same diameter forks.

Xr250 96-02 : .35
Xr250 90-94 : .40
Xr250 86-89 : .38



*I make no guarantees as to fit...

hmm racetech's site specs the 96 xr250 as having .398 kg/mm springs
as stock.
I certainly hope they are not the same as my 99 KDX @ .35 kg/mm

I guess I'll have to wait to measure when they get here.

of course 4strokes.com says these springs are .38 kg/mm just like the XR400. So I guess we'll have to definitely measure them.

I am sure the shop I am using will measure them for me when I drop off my USD forks so I'll know before I get them installed.