YSS Rear Twin Shock Gas Eco Line - 789.02.20
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Product Information
Full details
The YSS Rear Twin Shock Gas Eco Line (789.02.20) is designed for motorcycle enthusiasts seeking a reliable and cost-effective upgrade to their bike's handling and suspension stability. This unit offers enhanced precision over standard OEM parts through its advanced gas emulsion technology, though riders should note that the 30mm length increase over stock specifications may alter the bike's geometry and seat height.
All features
| Model Part Number | 789.02.20 |
|---|---|
| Brand | YSS |
Extended Product Information
FAQs
Does this shock come with tools for adjustment?
YSS shocks typically include the necessary C-spanner for preload adjustments, though specific inclusions can vary.
Can I adjust the length of the shock?
No, the length is fixed at 30mm over OEM specs and is not manually adjustable on this specific Eco Line model.
Is this shock rebuildable?
The Eco Line is primarily designed as a maintenance-free economic replacement; while the spring is adjustable, the gas/damper unit is generally sealed.
Will the extra 30mm make my bike unstable?
The increase in length can sharpen steering geometry. Most riders find this improves agility, but extreme changes can affect high-speed stability.
How often should I service the shocks?
For street use, inspect the shocks every 5,000 miles for leaks, mounting hardware security, and smooth operation.
Troubleshooting
Bike feels too harsh or bouncy
Adjust the rebound damping settings toward the 'soft' side or check if the spring preload is set too high for your weight.
Bottoming out during heavy loads
Increase the spring preload to support the additional weight and ensure the damping is set to a higher level.
Oil visible on the shock rod
Small amounts of residue can be normal, but if oil is dripping, the internal seal is likely compromised and requires servicing or replacement.
Pros and Cons
Pros
- Improved handling characteristics compared to stock suspension
- Gas-charged system prevents oil cavitation
- Fully adjustable preload and rebound settings
- Durable 12mm rod for long-term reliability
- Economical solution for performance suspension upgrades
Cons
- The 30mm extra length changes motorcycle geometry
- Installation may require professional adjustments to bike height
- Standard spring rates may need adjustment for very light or heavy riders
Setup, Compatibility & Care
Installation should be performed by a qualified mechanic to ensure proper bolt torque and alignment. Because the shock is 30mm longer than the OEM unit, check for chain tension and potential clearance issues with the rear tire or chain guard upon installation. To maintain the unit, keep the rod clean of debris to prevent seal damage. Periodically check the preload adjustment collars to ensure they are locked securely, and clean the external surface with mild soap and water, avoiding high-pressure washers that could force contaminants past the seals.