Engine Fluids, Gear Oil & Filter Specifications
| Engine Oil Viscosity & Standard | SAE 10W-40 API SL/SJ JASO MB |
|---|---|
| Engine Oil Capacity | 0.8 L (drain) / 1.0 L (total) |
| Final Drive / Gearbox Oil | SAE 85W-140 / 80W-90 — 100 ml (refill) / 110 ml (total) |
| OEM Oil Strainer Part Number | 15421-M9Q-000 (Cleanable mesh screen) |
| OEM Air Filter Element Part Number | 17211-H9A-000 |
| Spark Plug Model & Electrode Gap | NGK DPR7EA-9 (0.8 – 0.9 mm) |
Field note: The SYM HD200 engine holds 0.8L for standard oil drains and 1.0L total capacity. Inspect and clean the 15421-M9Q-000 mesh strainer screen during every oil service. Gearbox requires 100ml refill (110ml total).
Cooling System
| Component | Coolant Thermostat |
|---|---|
| OEM Part Number | 19300-H9A-000 |
| Dimensions | Standard 22mm bypass |
| Torque Spec | Housing bolts: 10 Nm |
| Fluid/Notes | Opens at 71°C (160°F) |
| Cross-Compatibility | SYM Citycom 300i |
Field note: A thermostat opening at 71°C is on the cooler end of typical scooter specs; installing a substitute rated for a higher opening temperature (common when sourcing from a "compatible" generic part) causes the engine to run consistently hotter than designed, accelerating wear on piston rings and valve seats over time. Always verify the exact opening temperature stamped on the replacement part before installing, and keep housing bolt torque at 10 Nm to avoid warping the thin cast housing.
Engine Internals: Cylinder Head & Crankshaft
| Part No. | Qty | Part Name | Notes |
|---|---|---|---|
| 12100-H9A-000 | 1 | Head Comp., Cylinder | Resurface flatness tolerance 0.05mm max |
| 12210-H9A-000 | 1 | Valve, Exhaust | Check margin thickness > 0.5mm before reuse |
| 12220-H9A-000 | 1 | Valve, Inlet | Larger head diameter — do not swap positions |
| 12251-H9A-000 | 1 | Gasket, Head Cyl. | Single-use metal composite; never reuse |
| 14100-H9A-000 | 1 | Camshaft Comp. | Chain-driven; inspect lobe wear before reinstall |
| Part No. | Qty | Part Name | Notes |
|---|---|---|---|
| 13300-H9A-000 | 1 | Crankshaft Comp. | Check runout < 0.03mm on V-blocks |
| 13210-H9A-000 | 1 | Connecting Rod | Big-end side clearance spec: 0.1-0.4mm |
| 13010-H9A-000 | 1 | Piston (Std.) | Domed piston, 3-ring set |
| 13111-H9A-000 | 1 | Piston Pin | Lightly oil before install; hand-pressure fit only |
| 13115-H9A-000 | 2 | Piston Pin Clip (Circlip) | Directional installation — see expert note below |
Field note: On this liquid-cooled single, the piston pin circlips must be installed with the opening gap oriented 90° to piston travel, never fore-or-aft. A backward clip compresses under inertial load on every stroke until it walks out of its groove and ejects into the crankcase, and the freed pin gouges the cylinder wall on the following stroke, destroying the bore. Because this engine shares its cooling circuit with the thermostat covered above, any debris circulating in the block after a botched piston service can also foul the coolant passages. Use only new clips and confirm full seating by feel.
Official Technical Reference
The specifications above are cross-checked wherever possible, but this guide does not replace the factory service manual. Before ordering parts or performing a repair, confirm current fitment and revision bulletins directly with SYM.
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