Replacement Rear Shock (again!)

<Swiped>

The spring rate list copyright Lukemillar (or he posted it in my thread)

YEAR MOTORCYCLE LENGTH SPRING
===== ========= ===== =====
00-03 GSXR750 325mm 400#

01-03 GSXR600 325.5mm 325#

01-02 GSXR1000 329.5mm 430#

03-04 SV650 330mm 430# <<<==== stock 2nd gen...05 should be the same

99-03 GSXR1300(Busa) 330mm 700#

04 GSXR750 332.5mm 408#

04 GSXR600 332.5mm 425#

03-04 GSXR1000 332.5mm 480#

99-02 SV650 337mm 510# <<<====stock 1st gen

04 ZX10R 338mm 540#

03-04 ZX6R(636) 340mm 540# *corrected by e lo...thanks!

96-99 GSXR750 345mm 375#

97-00 GSXR600 375mm 375#

05 GSX-R 1000 332.5mm 450# <<<===added by me...spring rate from racetech.com, length from ohlins.com

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So basically the ZX10 and the ZX6 shocks are the same spring rate, but the 636 shock is slightly longer, this will aid ground clearance, you might want to consider some shorter dogbones too.

[Luckypants]

Originally Posted by Blue_SV650S

you might want to consider some shorter dogbones too.

what would this do?

Thanks for the list, that is fantastic. That means that the spring is about 6% stiffer and slightly longer. So ia better, but not a great deal.

Setting compression damping might limit the rate of travel to help the spring out but will that help me outon the weiht side of things? Or is it the case that ZX-10 / ^£^ shock allows for more preload to overcome the sag caused by pillion weight?

Originally Posted by Luckypants

what would this do?

Thanks for the list, that is fantastic. That means that the spring is about 6% stiffer and slightly longer. So ia better, but not a great deal.

Setting compression damping might limit the rate of travel to help the spring out but will that help me outon the weiht side of things? Or is it the case that ZX-10 / ^£^ shock allows for more preload to overcome the sag caused by pillion weight?

Shorter Dogbones raise the rear a bit.

As has been mentioned, you are going to need a nasty spring to do the job properly, using preload and damping to compensate really isn't the way forward!!! Try the 636 shock and the shorter dogbones, you might find this is good enough??

A small point, but in an ideal world (hah, hah), sorting the compression damping is the way to prevent the bottoming. The spring rate or preload should be used to get the sag right.

[northwind]

Well, I'd say getting the spring rate right is how to stop the bottoming...

[21QUEST]

It'll be a combination. Bottoming out can be damping or spring

Getting the right spring rate in this instance I would say be more of a compromise than usual unless majority of use is definitely two up.

Two up for me is not really fun so I wouldn't care too much for that and so set up would be biased towards solo. You could fraff around with shocks off other bikes (and be sort or maybe not) or get a shock specific to your needs. . An emulsion shock built for you would set you back a little bit over £300 or some places do have deals on Ohlins shock cheaper than list price if you shop carefully.

At this juncture I'll say you have to think how about how much you prepared to pay for a solution and go from there.

I know what I'll do myself .

Cheers
Ben

[northwind]

He's right, you know...

Sorry to jump in here, but can someone post a pic of the cut made to the battery box. I might be interested if its not too difficult.

Thanks.

[Luckypants]

As this is likely to be a winter project, I've got some time to weigh all this up. From the useful list posted above, I spotted that the 'busa spring is shorter but with a 700# spring - 40% stiffer than stock.

What's the view on the effect of this for carrying a pillion? Be too stiff even with 24 odd stone on board? Will it beak my back without a pillion?

I reckon riding is about 50/50 pillion/solo - great for working out the compromise!

Originally Posted by Davido

Sorry to jump in here, but can someone post a pic of the cut made to the battery box. I might be interested if its not too difficult

you can kind of see mine here:

http://eeyore.mu-dog.net/sv650/sv650_shock/foo_004.jpg

http://eeyore.mu-dog.net/sv650/sv650_shock/foo_005.jpg

this is for an '06 zx10r shock. I've seen blue_sv's & his reservoir is in a different place - more up near the top shock pivot

~a