User manual CANNONDALE FG9910 OHLINS FORK

[. . . ] Owners manual Öhlins motocross front forks FG 9910 Cannondale Including: Setting up your bike Fine-tuning Service the fork Trouble shooting Technical info Spare parts & tools Traction, handling, comfort and safety 1 Öhlins motocross front forks FG 9910 Cannondale Contents Safety signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Before you start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] A change in oil level should be made in small steps. We recommend a change of 5 mm at a time and not outside the range of 80-130 mm. Oil level adjustment As the air trapped between the oil and the top nut acts as an air-spring, a change in oil level will effect the damping forces. Not in the early stage of fork travel, but a great deal in the later stage. A general description of how the oil level/air-spring effects the damping forces are shown in fig 5. The air-spring gives the Öhlins USD fork a progressive spring rate, preventing it from bottoming out hard. By using different combinations of springs and oil levels/air-springs you can alter the characteristic of the fork and tailor it to suit different tracks and conditions. Maintenance Telescopic front forks depend on a smooth, friction free action. Make sure your forks are regularly serviced. Do not use strong solvents, such as brake cleaner, to clean the front forks. This will dry out the seals and the steel tubes and cause friction or leakage. After every race: Clean externally and spray with an all-purpose oil after washing with detergent. Put a little Öhlins green grease (148-01) on the steel tubes and work it in by pushing the fork up and down. Every 20 hours: Dismantle the fork and check all parts for wear and damage, replace if necessary, see page 10. NOTE! See mounting instruction for recommended settings. NOTE! Higher click numbers give less damping force. When making adjustments; keep notes, make adjustments one at a time. . . The adjusters should normally not be adjusted in steps of more than 2 clicks at a time and not outside the usable click range. When you think you have made an improvement, go back to what you started with and double check to be sure. Pay attention to changes in conditions like tires, temperatures etc. 6 CAUTION! The oil level must be the same in both front fork legs. Riding a bike with different oil levels will cause instability. When the oil level is raised: The air-spring in the later half of travel is strong, and thus the front fork hard. When the oil level is lowered: The air-spring in the later half stage of travel is soft, and thus the front fork soft. Oil level General handling set-up A Front end falls into the curves (over-steering) especially in sand. Front end too low in comparison to rear end. Increase the front fork compression damping. Lower fork leg approximately 5 mm in the triple clamp. [. . . ] Install the spring and the preload spacer. Notes e f Install the fork top cap and the lock nut. Tighten the top cap and the lock nut against each other, use a 16 and 24 mm wrench. For tightening torques, please see your bike's work shop manual. Adjust the compression- and the rebound valves according to the specification card. 12 Service tools 3 2 1 Pos. 1 2 3 4 5 Part No. 1799-02 0786-03 1797-01 0787-03 1702-02 Description Bushing/seal mounting tool Inner tube tool Tool-cylinder tube lid Cylinder tube tool (cartridge) Bushing remover tool 4 5 Technical specifications Rebound and compression adjustment Refer to mounting instruction for set-up data. [. . . ]