01 kx fork spring interchange

Questions and comments about converting to beefier forks..
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Malibu406
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01 kx fork spring interchange

Post by Malibu406 » 02:21 am May 21 2020

Not sure if this has been covered as my search didnt work out so well.

I have 01 kx forks on my 05 kdx220 that I detailed in another post. I would prefer not to spend $120 on fork springs. Does anyone have a list of springs that interchange?

Here are some I think do interchange
96 - 01 Cr500 98-01 Cr125; 51401-kz4-j01(.39kg), 51401-mac-781(.41kg), 51403-mac-741(.43kg)

99-01 kx125/250; 44026-1691(.44kg), 1692(.45kg), 1690/1709(.43kg), 1599(.40kg), 1707(.41kg), 1712(.42kg)

Racetech frsp 4147 series or srsp 6228
Factory connection???
Eibach???
Patriot???

If you have any more, I can add. I know at least 2 years for rm250 are same but need to find it again.

Yes I am wasting allot of time vs money, but time is free.

Thx

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KDXGarage
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Re: 01 kx fork spring interchange

Post by KDXGarage » 09:23 am May 21 2020

SRSP 6228 is a shock spring.

Look on eBay for 4147 springs.

I assume Eibach used to make some years ago. I don't think they make that model now.

I have never heard of Patriot brand springs.

If you don't mind me asking, what is your weight in full riding gear, water backpack, tools, spare parts, extra fuel, etc.?
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Malibu406
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Re: 01 kx fork spring interchange

Post by Malibu406 » 04:32 pm May 21 2020

Yes, 6228 is a shock spring. I will go back and get the alternate eibach springs from racetech, but I believe eibach own literature is different numbering like 915.025.001 as just an example.

Im about 235 loaded. See I see allot of used .44 and .46kg springs out there, but not for kx250 99-01. I see them for yz’s, cr’s, and rm’s which all had 46mm at one time. Some, like the cr500 I believe are the same 41.2 od x 470mm long that i need. Others are same diameter but 461mm long (some rm’s) and some are 480+.

So while buying new may be what I do in the end, I just thought a thread like this could help future people find cheaper used sets. Its sort of a mental exercise at this point! Lol

There are several .43kg cr500 springs out there for instance, cheap. Not .44 or .46.

Thx

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KDXGarage
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Re: 01 kx fork spring interchange

Post by KDXGarage » 05:00 pm May 21 2020

.44 / .45 / .46 and 5.4 then

YZ springs in that time frame were about 10 mm shorter. I can't remember the exact length of OEM, but RT was 4146, not 4147.

ALONG time ago, they did sell odd rates.

Some springs do indeed fit multiple bikes.
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Re: 01 kx fork spring interchange

Post by rungrandpa » 08:28 pm May 21 2020

DRZ 350 and 400 springs are the same size. .38 and .40 I think.

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