1. Introduction
This manual provides essential information for the installation, operation, and maintenance of your Ohlins STX36 Scooter Rear Shock, model HO919. This high-performance shock absorber is designed to enhance the ride quality and handling of your 2019 Honda Z125M. Please read this manual thoroughly before installation and use to ensure proper function and safety.
2. Safety Information
Warning: Installation and service of shock absorbers should only be performed by qualified personnel with appropriate tools and experience. Improper installation or adjustment can lead to serious injury or damage to the vehicle.
- Always wear appropriate personal protective equipment (PPE) during installation and maintenance.
- Ensure the vehicle is securely supported before beginning any work.
- Never attempt to disassemble the shock absorber. It contains high-pressure gas and oil, which can cause injury if released improperly.
- Refer to your vehicle's service manual for specific torque specifications and procedures.
- After installation, always perform a functional check of the suspension and brakes before riding.
3. Product Overview
The Ohlins STX36 Scooter Rear Shock (HO919) is a high-quality, adjustable mono-tube shock absorber. It features a 36mm piston diameter, designed for optimal performance and durability. Key components include the spring, spring preload adjuster, and damping adjusters (if equipped).
Image: Two Ohlins STX36 Scooter Rear Shocks, featuring bright yellow springs and silver-colored bodies, designed for rear suspension applications. The shocks are shown side-by-side, highlighting their robust construction and adjustable components.
4. Setup and Installation
Note: Professional installation is highly recommended for this product.
- Preparation: Secure the motorcycle on a stand, ensuring the rear wheel is off the ground. Remove any bodywork necessary to access the original rear shock absorber.
- Removal of Original Shock: Carefully unbolt the original shock absorber from its upper and lower mounting points. Retain all original hardware unless new hardware is provided.
- Installation of Ohlins Shock: Position the new Ohlins STX36 shock absorber. Install the upper and lower mounting bolts, ensuring they are correctly aligned. Do not fully tighten bolts at this stage.
- Torque Specifications: Refer to your Honda Z125M service manual for the correct torque specifications for the shock mounting bolts. Tighten all bolts to the specified values.
- Clearance Check: Before reassembling bodywork, check for adequate clearance between the shock absorber and all surrounding components throughout the full range of suspension travel.
- Final Assembly: Reinstall any removed bodywork.
5. Operating and Adjustment
The STX36 shock absorber offers adjustability to fine-tune your scooter's handling characteristics. Always make adjustments in small increments and test the changes in a safe environment.
- Spring Preload: Adjusting the spring preload changes the initial compression of the spring, affecting ride height and sag. Use the provided tool to turn the preload adjusters. Increase preload for a firmer ride or to compensate for heavier loads.
- Rebound Damping (if equipped): Rebound damping controls the speed at which the shock extends after compression. Adjustments are typically made via a clicker knob at the bottom of the shock. Turn clockwise for slower rebound, counter-clockwise for faster rebound.
- Compression Damping (if equipped): Compression damping controls the speed at which the shock compresses. Adjustments are typically made via a clicker knob on the reservoir or body. Turn clockwise for firmer compression, counter-clockwise for softer compression.
Consult an Ohlins authorized service center or a suspension specialist for personalized setup advice.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your Ohlins STX36 rear shock.
- Cleaning: Keep the shock absorber clean from dirt, dust, and road grime. Use mild soap and water, then rinse thoroughly. Avoid high-pressure washers directly on seals.
- Inspection: Periodically inspect the shock for any signs of oil leaks, damage to the shaft, spring, or mounting points. Check for loose bolts.
- Service Intervals: Ohlins recommends regular service by an authorized service center. Service intervals depend on usage, but typically every 1-2 years or after significant mileage.
- Storage: If storing the vehicle for an extended period, ensure the shock is clean and stored in a dry environment.
7. Troubleshooting
This section addresses common issues you might encounter with your rear shock absorber.
| Problem | Possible Cause | Solution |
|---|---|---|
| Poor ride comfort / Harsh ride | Excessive spring preload, too much compression damping, incorrect spring rate. | Reduce spring preload, reduce compression damping, consult a specialist for spring rate. |
| Excessive bottoming out | Insufficient spring preload, too little compression damping, incorrect spring rate. | Increase spring preload, increase compression damping, consult a specialist for spring rate. |
| Rear end feels loose / Unstable | Too fast rebound damping, insufficient compression damping. | Increase rebound damping (slower), increase compression damping (firmer). |
| Oil leakage | Damaged seals, internal component failure. | Contact an authorized Ohlins service center for inspection and repair. Do not attempt to repair yourself. |
If you experience issues not listed here or if the suggested solutions do not resolve the problem, contact an authorized Ohlins service center.
8. Specifications
| Brand | Ohlins |
| Model | HO919 (STX36) |
| Manufacturer Part Number | HO919 |
| Item Weight | 8.38 pounds |
| Product Dimensions | 23.3 x 9.3 x 7.3 inches |
| Auto Part Position | Rear |
| Vehicle Service Type | Motorcycle (Honda Z125M) |
| Exterior Finish | Painted |
9. Warranty and Support
Ohlins products are manufactured to high standards and come with a manufacturer's warranty against defects in materials and workmanship. For specific warranty terms and conditions, please refer to the official Ohlins website or contact your authorized Ohlins dealer.
For technical support, service, or spare parts, please contact an authorized Ohlins service center or visit the official Ohlins website for dealer locator information. Always provide your product model (HO919) and purchase details when seeking support.
Official Ohlins Website: www.ohlins.com
