Designed to maintain factory-specified transmission geometry, this aftermarket Fixed pulley SYM Symphony 125i LC ST 4T E4-E5 2018-2022 is specifically developed for the SYM Jet 14 125I 125cc scooter, covering model years 2017 through 2019. Cross-reference OEM number: 22102-HJA-000.
The fixed pulley (also known as the torque driver or driven pulley) works in tandem with the variator to maintain belt tension and optimize power delivery. It is mounted on the rear wheel hub and responds to centrifugal force and spring pressure.
Technical specifications: Pulley diameter: 115mm | Sheave angle: 28.5° | Spring rate: 28 N/mm | Bushing material: bronze-graphite composite | Weight: 420g | Surface treatment: hard anodized
Installation guidance: Remove the rear wheel and CVT cover. Loosen the pulley nut with an impact wrench. Clean the shaft splines and apply anti-seize compound. Torque the retaining nut to 55-60 Nm. Verify smooth pulley movement by hand.
Indications for replacement include belt slippage under load, difficulty reaching top speed, or visible wear grooves on the pulley faces deeper than 0.5mm.
This is an aftermarket replacement part, not an OEM genuine component. SKU: SYM-001104.
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