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Hi All.

I'm looking for the STD 2002 Honda XR400R suspension link, the on people take off to put a lowering link on there bike, I think it's called a I link.

Prefer here in the UK if possible.

Thanks for any help.

Edited by sage

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Hi All.

I'm looking for the STD Honda suspension link, the on people take off to put a lowering link on there bike, I think it's called a I link.

Prefer here in the UK if possible.

Thanks for any help.

Are you looking for a 3 1/4" link which my '87 XR250R and '85 XR600R came with or the 3 1/8" link like my '94 XR650L came with?

I used a 3 1/8" link on on my '87 XR250R for 3/8" increase over stock. :smashpc:

There my be other lengths available... I don't know for sure. 👍

:busted:

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Are you looking for a 3 1/4" link which my '87 XR250R and '85 XR600R came with or the 3 1/8" link like my '94 XR650L came with?

I used a 3 1/8" link on on my '87 XR250R for 3/8" increase over stock. :smashpc:

There my be other lengths available... I don't know for sure. 👍

:busted:

Hi

Thanks for the response, I forgot to put in my post it's for a 2002 XR400R, I don't know what length the original one is, I want to put the bike back to std, would you know if any of the other XR'S linkage fit the 2002 model, I think all 400's are the same, but is the 250 or 600 ones fit ??

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Hi

Thanks for the response, I forgot to put in my post it's for a 2002 XR400R, I don't know what length the original one is, I want to put the bike back to std, would you know if any of the other XR's linkage fit the 2002 model, I think all 400's are the same, but is the 250 or 600 ones fit ??

I don't know what length you need, I've never had a XR400. :smashpc:

The links I listed all interchange. :busted:

You might want to trade with someone who wants a lowering link in the UK. 🤣

Does anyone know the stock length of a XR400 link???????? 🤣

👍

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Honda calls the link a "Rod". I don't know the length of the XR400 link but I have the lengths of 4 other other candidate links:

84-85 XR200R/250R 52470-KF0-010 84.1mm

86-88 XR200R 52470-KT0-670 81.6mm

86-95 XR250R 52470-KN5-000 84.5mm

96-04 XR250R 52470-KCZ-000 79.9mm

A longer link will lower the bike.

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Honda calls the link a "Rod". I don't know the length of the XR400 link but I have the lengths of 4 other other candidate links:

84-85 XR200R/250R 52470-KF0-010 84.1mm

86-88 XR200R 52470-KT0-670 81.6mm

86-95 XR250R 52470-KN5-000 84.5mm

96-04 XR250R 52470-KCZ-000 79.9mm

A longer link will lower the bike.

The longer link lowers the bike and lowers the spring stiffness.

A shorter link will raises the bike and increases the spring stiffness.

The stiffness change is caused by the change of the ratio rate.

The change in length is about 3x. 4mm = about a 12mm change.

So far here is a part numbers to application list and which one are missing. :smashpc:

84-85 XR200R 52470-KF0-010 84.1mm

84-85 XR250R

83-84 XR350R

83-84 XR500R

85-87 XL250R

84-85 XL350R

83-87 XL600R

86-88 XR200R 52470-KT0-670 81.6mm

88-00 XR600R

93-00 XR650L

86-95 XR250R 52470-KN5-000 84.5mm

85 XR350R

85 XR600R

96-04 XR250R 52470-KCZ-000 79.9mm

96-04 XR400R 52475-KCY-670 Length needed

86-87 XR600R 52470-MK2-770 Length needed

01-03 XR650L 52479-KZ1-305 Length needed

04-09 XR650L 52475-MY6-A40 Length needed

chuck4788, Thanks for your accurate measurements. 👍

If any one can help complete the list post up :busted:

Aftermarket lowering link lengths would be great too. 🤣

Thanks. 🤣

🤣

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On 10/5/2011 at 9:19 AM, MentalGuru said:

The longer link lowers the bike and lowers the spring stiffness.

A shorter link will raises the bike and increases the spring stiffness.

The stiffness change is caused by the change of the ratio rate.

The change in length is about 3x. 4mm = about a 12mm change.

So far here is a part numbers to application list and which one are missing. :smashpc:

84-85 XR200R 52470-KF0-010 84.1mm

84-85 XR250R

83-84 XR350R

83-84 XR500R

85-87 XL250R

84-85 XL350R

83-87 XL600R

86-88 XR200R 52470-KT0-670 81.6mm

88-00 XR600R

93-00 XR650L

86-95 XR250R 52470-KN5-000 84.5mm

85 XR350R

85 XR600R

96-04 XR250R 52470-KCZ-000 79.9mm

96-04 XR400R 52475-KCY-670 Length needed

86-87 XR600R 52470-MK2-770 Length needed

01-03 XR650L 52479-KZ1-305 Length needed

04-09 XR650L 52475-MY6-A40 Length needed

chuck4788, Thanks for your accurate measurements. 👍

If any one can help complete the list post up :busted:

Aftermarket lowering link lengths would be great too. 🤣

Thanks. 🤣

🤣

An old thread but some good info.  What are the pros and cons of having an increase or decrease spring stiffness?  Also is there more info to fill in these data points?

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Effective wheel spring rate is the shock spring rate times the linkage ratio. Since the linkage ratio varies between full extension (max) and full compression (min), the statement is without enough specifics for me to use in my suspension tuning.
The concept of variable linkage is to have soft at full extension (max ratio) and hard at full compression (min ratio), and the turd in the punch bowl is shock damping needs to be matched to the string rate. This means the best solution for progressive suspension is a single rate spring on a shock, and use linkage to vary the rate to the wheel. Our linkage does that but the XRs have a pretty high linkage rate compared to MX bikes and I think that was a compromise to cover a wider range of riding conditions and keep most of the linkage above the swing arm.  XR linkage require a spring almost twice as stiff as those using MX type of linkage. 
My tests on XR linkage ratios indicate almost 4:1 at full extension and about 2:1 at full compression.  So almost a 2:1 change during compression; doesn't sound like a lot but it really is.

There are more variable here since the stock shocks can be pretty bad for damping and I have needed to use stiffer springs, however a next gen shock allowed me to go back to a stock spring. I do need to attempt to qualify that as RaceTech says their tract tests show  fastest suspension is softer and less damped than rider preference. 🤦

The SA linkage is classic 4 bar linkage so SW is available to analyze it and I'm sure Honda has used all tools avail to design all of the different linkages used on their many models of bikes. My only input is a longer link will lower the seat at full extension, and my laundry list shows that Honda uses a bunch of different linkage parts on the XRs. I have measured my recommendations on a mock up chassis, pictures are  in my XR200 Weight Reduction thread. After after almost 10 years of riding I only had one hard bottom incident on the rear suspension in 3rd gear jumping over a culvert on a trail.  That jump was on a known trail and was not a problem until I moved the foot pegs aft 1".  However I have often bottomed the front suspension.

I feel seat height is a big issue on technical trails because of the need to be able to put a foot on the ground.

 

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