Another rear spring thread.... - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 13 Old 12-17-2016, 02:08 PM Thread Starter
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Another rear spring thread....

Hey guys, I'm on the prowl looking for a rear spring replacement. It's my understanding the the rear spring on a KLR is a 10" long spring with a 2.25" I.D.

Now check this out. If you order the Eibach spring (highly respected name in springs) from Happy Trails look at the SKU number.

Eibach Racing Springs for KLR650

The SKU is : 0900.225.xxxx

Or simply put, it's a 9" spring with 2.25 I'D. and a spring rate of xxx- you need to choose the spring rate.

If you go here and do a search for Eibach springs we find that a 9" spring is the longest coil they make with a 2.25" I.D. To get a 10" coil we need to jump up to a 2.50" I.D.

Also, rather than pay Happy trails $90 for that spring from Eibach, it is available from Summit for $59.95. Sorry, HT.

https://www.summitracing.com/parts/e...0400/overview/

$10 shipping using their ebay ad.

Eibach Coil-Over Spring 09002250400 | eBay

https://www.summitracing.com/search/...coil%20springs

Cool, but that spring is 1" shorter than stock. Are they supplying 1" spacers to correct this, or what?

400 lb'in means the spring should sag 1" per every 400 lbs applied to it. Thinking about rider sag,it seems odd to have a 9" spring. It seems to me that it would create an instant 1" drop in ride height. Thoughts on this, please?




Regardless, for a 225lb rider, this is telling me that a 400lb/in spring rate is in the ballpark for a rider my size. But a "perfect" replacement would be a 10" long 400 lb/in spring with a 2.25 I.D.

So if you want a 10" 400lb/in spring you can get a Summit branded ( re-branded QA1 according to me sources) spring here for $45
https://www.summitracing.com/parts/s...-400/overview/

Then use the nylon adapters from Koni to reduce the 2.50" spring I.D. down to the proper 2.25" I.D. for $6 for the pair.

https://www.summitracing.com/parts/k...0030/overview/

That has you at $51 all in for a 10' spring with spacers, or $60 for a 9" for a rear spring vs the $90 the "bike parts suppliers" are charging us.

Just thought I would share that savings.


Now, I would really like to hear peoples thoughts about that 9" Eibach spring.
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post #2 of 13 Old 12-17-2016, 03:48 PM
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As far as I know, all the Eibach for a KLR are 9". The two I have had were.

The installed length, of course, is less than 9" and that compression is what provides pre-load.

The spring rate on the stock spring is quite low. In order to get some pre-load on it for the 150 pound rider not to sag the thing flat, they use a long spring. Voila! You have pre-load so the suspension works, but a nice, soft, plushy, useless spring due to the low spring rate.

Think backwards for a minute. If the stock KLR spring, with its spring rate, were only 9" long, what would happen when a rider got on?

What would happen if the Eibach spring were 10" long, given it's spring rate? You'd be adding 400 pounds of pre-load over whatever pre-load a 9" spring would have. HFS!

Thus, a spring with an appropriate spring rate for the average American (well north of the 150 pound rider design) and the KLR's suspension geometery should be 9" long.

Tom
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post #3 of 13 Old 12-17-2016, 05:20 PM Thread Starter
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Thank you, Tom. As usual, you understand things that confuse me. Your explanation makes perfect sense.

Do you agree with the 400# Eibach being pretty close for a 225# rider according to your experience?
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post #4 of 13 Old 12-17-2016, 05:46 PM
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A 400 pound spring sounds about right. When I got my 2009 it had a Ricor shock on it with an Eibach 450. The previous owner was easily 6'6" and weighed about 260 pounds. That was a bit too stiff for me; I run about 215.

My Cogent Moab has an Eibach 400 on it.

Tom

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post #5 of 13 Old 12-17-2016, 06:02 PM Thread Starter
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Awesome. Thanks for your input, as always.
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post #6 of 13 Old 12-17-2016, 06:55 PM Thread Starter
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So looking back at this with the idea of a 9" spring being the actual correct length ( good call, Tom), I found that QA1 sells what they call a High Travel spring:

"Available in 7”, 9”, 10”, 12”, 14” and 16” lengths, QA1 offers an assortment of high travel springs with a silver powder coated finish. Made in the USA, these 2 ½” I.D. high travel springs are manufactured from specially designed high-tensile, chrome silicon alloy spring wire, which allows them to have fewer coils and a smaller wire diameter. As a result, these springs are lighter and have increased travel due to the larger distance between the coils. These lighter springs reduce unsprung weight and react faster, optimizing suspension performance.

In addition, this high-grade material, along with careful heat-treating and post-processing, allows for greatly improved fatigue life, and the coil design allows the springs to be compressed to coil-bind without affecting spring rate or free height.

These new high travel springs are silver powder coated and ground at both ends for straight, consistent and accurate operations. In addition, all QA1 springs are lifetime guaranteed to remain within 2% of the original free height and rate under normal operating conditions."


Eibach's have a total travel of 5.2". So, take a 9" spring and compress it to 8" and you have 4.2" of travel left before you reach coil bind. Activate the available 5/8" ( 0.625") of preload available with the stock clicker, and you are looking at roughly 3.5" of spring travel available...hmm, seems tight. The closer/ more often you operate towards coil bind, the quicker you reach the fatigue life of the spring.

I feel like the QA1 High Travel springs might be a better choice for the KLR. They won't operate as close to coil bind, they should be lighter ( always a plus with the KLR in mind), they are guaranteed for life ...oh, and they are $10 cheaper!

Since I have the lathe handy I am able to make my own spacers to correctly fit the QA1 2.5" spring at no extra cost, otherwise I would probably go with the Eiback for direct bolt-on goodness.

I am unable to find actual product weights to compare, and I'm not able to find a spec from QA1 saying what the compressed/coil bind height of their 9" High Travel spring is. Gonna shoot 'em an email and see what they say.


EDIT:

Eibach: Part# 09002250400 (9", 2.25"I.D., 400 lb/in) spring = 2.98lbs (5.2" travel)
a 350 lb/in spring = 2.98 lbs (travel drops to 5.15")
a 450 lb/in spring = 3.35 lbs (travel drops to 4.98")
Still waiting on word back from QA1
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post #7 of 13 Old 12-18-2016, 07:05 PM Thread Starter
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I finally got my bike clean enough to take some decent measurements. With my preload clicker maxed out, the bike sitting unloaded ( I have 0 static sag) I measured roughly 2.5" of exposed shock piston. I was really shocked that there wasn't more ( did I just miss a golden opportunity for a Swifty?)

Obviously, the amount of travel on the Eibach's work. I was just curious how much stroke the shock has in operation. Not much! The QA1 High Travel spring still appeals to me. Lighter and cheaper, what's not to like? Well, possibly lighter...still waiting for an email from QA1 to confirm specs.
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post #8 of 13 Old 12-19-2016, 10:06 AM
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Racetech has a spring rate calculator that may be better than guessing; RT - Digital Product Search


.....or you could just call Rick or Todd at Cogent and give them all your particulars (weight, riding style, usage, etc.) and they will ship you a shiney new Moab shock with the right spring already on it! ;-)

Cheers,
Dave
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post #9 of 13 Old 12-19-2016, 06:19 PM Thread Starter
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lol I knew if you popped in here you would "suggest" that again!

Long story, but I can't justify spending that much on the bike right now. I desperately need a new spring, though. I'm just gonna do a spring and fluid change for now. I do HVAC for a living, so I have nitrogen on hand.


I heard back from QA1 today. The total travel between the Eibach spring and QA1's High Travel spring is deadnuts even. The QA1 spring weighs 3.80lbs, so only .09lbs less than the Eibach. Basically, they are identical other than the I.D. of the Eibach is what actually fits the bike. Soooo...all this mucking about was for naught and I'll be ordering the Eibach from Summit Racing soon.
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post #10 of 13 Old 12-19-2016, 06:24 PM Thread Starter
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Umm....is this something unique, or just another ebay seller not knowing what he has?

1993 Kawasaki KLR650 Rear Shock OEM | eBay

Edit: I messaged the seller. He confirmed that he pulled it off a '93 KLR 650, but he admits he thought it was unusual and knew it was not stock. A bit pricey to take a chance on, but I'm extremely curious to know what is, or what it may have come off of. I'm just skeptical that it actually would fit in the chassis with that reservoir. Hmm...

Edit v.2: pretty sure that's a KLX 650 shock, not a KLR. Brief Google searches says nothing for KLX shock on a KLR...So not necessarily a "no".

Last edited by shinyribs; 12-19-2016 at 09:47 PM.
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