Author Topic: Doing cheap suspension upgrade (racetech forks and GSXR shock) - Tips?  (Read 19190 times)

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Offline BigShot

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I just finished installing the Racetech springs .75kg and a 2001 GSXR600 shock today. Can I just say WOW, what a difference from stock.  The bike feels more stable, planted and I feel more in control.  After the work was done I couldnít help myself but take it on a local dirt road for an evaluation and I am happy with the results.  The fork springs are much more responsive and the spring quality is evident. The rear shock actually  has dampening characteristics including  adjustability and the spring weights are very balanced from front to rear.  The only difficult part is cutting part of the plastic fender to fit the shock, be careful  there is a wire that is above where you need to cut.

Fork oil 10wt 130mm from top, Race Tech .75kg constant rate springs, 15mm preload
2001 GSXR600 Shock that raised the seat by 3/4 inch
 I weigh 240 pounds and only ride paved, dirt and gravel roads.
 There are a few instructional videos on YouTube

Offline Sherloc

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Nice work, sounds like what I need. What spring rate are folks using with the GSXR 750 shock? Is it stock length or longer? Iím 230 with gear, figure 60 lbs of added luggage.

Thanks!
Last Edit: September 11, 2019, 03:58:52 AM by Sherloc

Offline Bradmeister

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Ignorance is Bliss

You are not "UPGRADING ON THE CHEAP" you are hacking your bike by shot gunning some new and used parts at it, and praying it's better.

Your Spring rate for 260lbs is too low at .95kg/mm and I'm guessing Race Tech does not have one ..........But Promoto, Wilbers and Hyper Pro does.

Really? A Used Track Bike Shock on a Sit Up bike with 27degree caster and a 110 trail?  Whats the Spring Rate of that Shock?  Whats the Seat height and did you have the shock Dyno tested? Or again, spray and pray?

Again, you could have spent 500 bucks and bought the correct springs and a shock with adj. Pre load, and rebound that would have been a great set up, and a well performng suspension.

Ignorance is bliss
2009 BMW K1200 GT, 2013 Kawasaki 650 Ninja,
(2)2015 Honda CB500X, 2013 KTM 350 SXF, 2013 CBR250R
2014 KTM 250 SX, 2007 KTM 250 SXF
2013 Husqvarna 125 TE, 2014 Kawasaki 140L, 2015 125 MSX, 2016 Click125

Offline SilverCycle

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When you guys have finished arguing, would one of you mind letting a newbie know what, exactly, an emulator is emulating? I saw RaceTech's website sort of telling me what it does... wot's the real thing that does it?

Offline Oyley

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I think they must have finished doing that in Sept 19 ! or,they killed each other as no post relating since... :082:

Offline Oyabun

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*Originally Posted by SilverCycle [+]
When you guys have finished arguing, would one of you mind letting a newbie know what, exactly, an emulator is emulating? I saw RaceTech's website sort of telling me what it does... wot's the real thing that does it?

It is officially called by birth as a "cartridge emulator" - and lo and behold it emulates a cartridge fork - sort of.
In layman's terms it does separate the three main damping action of the forks. Low and high speed compression, and rebound.
And yes, they are worth it. Probably you should also check PD valves from YSS, which are essentially the same as Racetech's gold valve cartridge emulators, but on a lower cost.

Online CBRDEAN0

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*Originally Posted by SilverCycle [+]
When you guys have finished arguing, would one of you mind letting a newbie know what, exactly, an emulator is emulating? I saw RaceTech's website sort of telling me what it does... wot's the real thing that does it?

Basically - the 500x forks are classed as orifice damping ( the size of the holes and the thickness of the oil controls the amount of damping )
Unfortunately - the holes need to be small enough to do the damping which means that they will hydrolock when you hit a sharp bump.

Cartridge dampers have bigger holes and the damping is controlled by a shim stack and the thickness of the oil.
The shim stack can be built to give different profiles of damping across the various riding conditions.

The cartridge emulators allow you to install a shim stack system in an orifice damping fork ( you drill the holes bigger during installation )
Last Edit: June 05, 2020, 01:09:37 PM by CBRDEAN0

Offline Trukes500

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You if works on new model ?

Best Regards

Offline timur

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*Originally Posted by Trukes500 [+]
You if works on new model ?

Best Regards
You are asking if it works on newer model? Sure it works - fork internals are similar.

Offline Trukes500

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Yes new model, but all new models have abs so need to be Cbr one? Need any alteration?
Best regards