Shock Absorber Type 641 Competition
Our suspension conversion realises a better response behaviour of the fork.
This is achieved by replacing the linear fork springs with progressive fork springs. The second spring rate provides a larger reserve.
The standard shock absorber has a relatively high rebound damping, so we have slightly increased the spring rate and adjusted the rebound and compression damping. This also adjusted the suspension geometry of the front and rear axle via the negative spring travel.
Our conversion also offers a significantly larger range of adjustment than the series.
With this shock absorber the compression tank is connected to the shocks´ body by a flexible steel hose. Therefore it is an ideal alternative for road motorcycles with limited space. The hose can be placed individually where there is enough space for example on the rear frame where air flow can provide additional cooling. The adjustment screws for high- and low-speed compression, each tunable in 22 clicks, can be easily reached from the outside. Rebound can be modified by an open bleed system in 22 clicks and the preload is continuously adjustable.
Product may vary from picture.
Additional Notes:
Compatible vehicles:
- 2020 - 2025 Kawasaki Z 900 | ZR 900 F / H
Pickup available at EPM Performance Imports
Usually ready for pickup or shipment in 3-4 weeks.
Shock Absorber Type 641 Competition
Edition: Blackline | Preload Adjuster: Hook Wrench | Lift/Lowering: Std
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EPM Performance Imports
Pickup available, Usually ready for pickup or shipment in 3-4 weeks.
3 Fedornak Freeway
Unit 1
Whiting NJ 08759
United States+17327869777
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Let customers speak for us
5 star
Everything I wanted and never knew I needed. Spec’d perfect. Didn’t even have to adjust sag.
100 times better than stock, wife on back says nothing compared to ouch or ugh when we hit a bump
I have spinal stenosis, this was exactly what I was looking for.
huge improvement !
replaced the ktm garbage, which had completely failed and was bouncing and bouncing and bouncing
Excellent service throughout. Thank you!
Fits perfectly
Very high quality
If you have a 40–50 lb rider on a Husqvarna EE 5 (or KTM SX-E 5 / TC 50), swapping out the factory shock spring for this 25 N/mm spring is hands-down the single best suspension upgrade you can make.
The stock rear spring is notoriously oversprung for young kids. Before installing this, our rider was getting bucked over braking bumps, the rear end skittered out in flat turns, and it was physically impossible to dial in correct rider sag—even backed all the way out on the preload collar.
Swapping to the 25 N spring completely transformed the bike's balance:
True Sag Numbers: Finally allowed us to set proper race sag (targeting ~60–65 mm) while still maintaining healthy static free sag.
Chassis Balance: Balances out the front WP air fork so the bike stays level and planted instead of riding stinkbug into turns.
Instant Confidence: The rear wheel actually tracks through acceleration chop and ruts now rather than deflecting. Our rider felt the difference on lap one—much less fatigue and far more control over rough, choppy sections.
Fit and finish (47x130) are spot-on, drop-in replacement with the stock WP shock collars, and the coating holds up to roost and power washing. Don’t waste time fighting the stock spring if your kid is under 55 lbs—this 25 N spring fixes the rear end completely. Highly recommend!
Awesome addition to the 390. The spring had made 2 up riding much more comfortable.
Sterrring damper is amazing! Got rid of all the head shake at high speeds. I only have it 5 clicks in and it's working as it should. The guys at EPM are great. Thanks!
Got shipped out right away
Easy to install
Was experiencing crazy tank slappers on my mt09 I bought this to try it out,absolutely game changing I have not experienced any sort of wobble since!
arrived quickly and packaged perfectly. Thanks.
