Read this first. Every value on this page is typical or indicative for the NC450-class 450cc single class, compiled for dealer workshops. Yangtze Moto Export is an export company, not the manufacturer. The owner’s and service manual supplied with each unit prevails wherever it differs; where a value is not printed in your manual, use these as a starting point and confirm by inspection.
Specifications (typical for the platform)
| Type | Single cylinder, 4-stroke, liquid-cooled, DOHC, 4 valves (typical for the platform; confirm on the unit’s spec sheet) |
| Displacement | 449.5 cc |
| Bore × stroke | 94.0 × 64.8 mm |
| Compression ratio | ≈ 11.5–12.0 : 1 |
| Fuel system | EFI, 42–44 mm throttle body, typically Delphi / Bosch-type ECU |
| Rated output | ≈ 30–34 kW (40–46 hp) @ 8,500–9,000 rpm; ≈ 40–45 Nm @ 6,500–7,000 rpm depending on tune |
| Starting | Electric (some enduro versions add kick start) |
| Gearbox | 6-speed constant mesh, wet multi-plate clutch, chain final drive (520 pitch) |
| Cooling | Liquid, twin radiators on rally/enduro, thermostat + electric fan |
| Fuel | 92 RON (95 recommended for sustained high load), typical tank 8–14 L (enduro) / 16–22 L (rally) |
Catalog models on this platform: 450cc Rally / ADV (NC450-class engine), 450cc Enduro (NC450-class engine). Model-specific figures are on each model page.
Fluids & capacities
| Engine oil | SAE 10W-40 or 10W-50, API SL+/JASO MA2 motorcycle oil; ≈ 1.3–1.6 L with filter change (typical) |
| Coolant | 50/50 ethylene-glycol motorcycle coolant; ≈ 1.1–1.4 L system |
| Brake fluid | DOT 4 (front and rear) |
| Fork oil | SAE 5W–10W fork oil; level per fork brand (KYB / FastAce / Yuan clones), typically 100–130 mm from top |
| Chain lube | O-ring-safe chain lubricant |
Break-in
- 0–300 km: keep below ≈ 5,000 rpm, vary the throttle constantly, no full-throttle runs, no sustained speed above 80 km/h. Avoid long idling.
- 300–800 km: gradually raise the ceiling to ≈ 7,000 rpm; short bursts of higher load are fine, sustained high rpm is not.
- 800–1,000 km: normal riding, still avoid holding maximum rpm for long stretches.
- First service at 300–500 km: change engine oil and filter (this is where the assembly debris comes out), check valve clearance, re-torque spokes, axle nuts, sprocket bolts and engine mounts, adjust chain, check coolant level and all fasteners on plastics and racks.
- Second service at 1,000 km: oil again, check valve clearance if it was not done at the first service, re-check chain and brakes.
Maintenance schedule
| Item | First | Then every | Notes |
|---|---|---|---|
| Engine oil | 300–500 km | Every 2,500–3,000 km or 6 months | Every 1,500 km in dust or race use |
| Oil filter | 300–500 km | Every oil change | |
| Valve clearance | 500–1,000 km | Every 5,000–6,000 km | Typical clearances: intake 0.10–0.15 mm, exhaust 0.20–0.25 mm — confirm in the manual |
| Air filter | 500 km | Clean every 1,000 km, replace 5,000 km | After every ride in sand/dust |
| Spark plug | — | Inspect 5,000 km, replace 10,000 km | Typical: NGK CR8E/CR9E-type or equivalent |
| Chain & sprockets | 300 km | Adjust/lube every 500 km; replace as a set 15,000–20,000 km | Slack ≈ 35–45 mm on the sidestand (typical) |
| Coolant | — | Check level monthly; replace every 2 years | |
| Brake fluid | — | Check level monthly; replace every 2 years | |
| Brake pads | — | Inspect every 2,500 km; replace at 1.5 mm | |
| Fork oil & seals | — | Every 10,000–15,000 km or when leaking | |
| Steering head & swingarm bearings | 1,000 km (re-torque) | Grease/inspect every 10,000 km | |
| Spokes | 300 km | Check tension every 1,000 km (off-road use) | |
| Battery | — | Check charge every 3 months if stored; ≈ 12.6–12.8 V rested |
Halve intervals for dust, sand, taxi/cargo duty or track use.
Torque values (indicative)
| Front axle nut | ≈ 60–80 Nm |
| Rear axle nut | ≈ 90–110 Nm |
| Rear sprocket bolts | ≈ 30–35 Nm |
| Front sprocket nut | ≈ 60–75 Nm (bend lock tab) |
| Brake caliper mounting bolts | ≈ 25–30 Nm |
| Brake disc bolts | ≈ 12–15 Nm (thread-lock) |
| Handlebar clamp bolts | ≈ 22–28 Nm |
| Triple clamp pinch bolts | ≈ 20–25 Nm (upper) / 25–30 Nm (lower) |
| Engine oil drain plug | ≈ 20–25 Nm |
| Oil filter cover | ≈ 10–12 Nm |
| Spark plug | ≈ 12–15 Nm |
| Engine mounting bolts | ≈ 40–55 Nm |
| Footpeg / subframe bolts | ≈ 25–35 Nm |
| Note | Indicative values for this class of machine. Use the value printed in the supplied manual if it differs. |
Tire pressures
| Enduro / trail (21" / 18") | Off-road 0.9–1.1 bar (13–16 psi); road 1.6–1.8 bar front / 1.8–2.0 bar rear |
| Rally / ADV (21" / 18" or 19" / 17") | Road 1.9–2.1 bar front / 2.1–2.3 bar rear; sand 1.0–1.2 bar |
| Tube type | Most units are tube-type; carry a 21" front tube, which also works in the rear in an emergency |
Common issues
| Symptom | Likely cause | Fix |
|---|---|---|
| Will not start after unloading; starter clicks or is slow | Battery discharged during 4–8 weeks of shipping (often shipped disconnected, sometimes partially charged). | Charge with a smart charger at 1–2 A for 6–10 hours before first start. Do not jump-start from a car with the engine running. If the battery will not hold 12.5 V after charging, replace it (claimable within the first 30 days). |
| Starts, then stalls; rough idle; smells of stale fuel | Factory test fuel has aged during transport, or the tank was drained and the injector rail is empty. | Fill with fresh 92–95 RON, cycle the key 3–4 times to prime the pump (listen for the 2-second whine), then crank. Idle for 5 minutes with the throttle closed so the ECU relearns. |
| Fault lamp on; ECU error code | A sensor connector loosened in transit (TPS, oxygen sensor, coolant temperature) or a disconnected fuel-pump plug. | Read the code: most Delphi-type ECUs blink the MIL when the diagnostic pin is bridged, or use a generic OBD-M / K-line reader (provided on request). Reseat every connector under the tank first; 80% of codes clear after this. |
| Engine overheats in slow riding; fan not running | Air lock in the cooling system, fan fuse pulled for shipping, or fan thermo-switch connector off. | Bleed the system: loosen the bleed screw or top hose with the engine warm, top up. Check the fan fuse (usually 10–15 A) and that the fan runs when 12 V is applied directly. Normal fan-on temperature is ≈ 95–100 °C. |
| Chain slaps or jumps; noise from the rear | Chain set loose for crating or over-tight at assembly. | Set slack to ≈ 35–45 mm at the tightest point with the bike on its stand; align using the swingarm marks; torque the axle. |
| Charging voltage low; battery drains overnight | Regulator/rectifier connector corroded, or a parasitic drain from an aftermarket alarm/GPS fitted at the factory. | Measure 13.8–14.5 V at 5,000 rpm across the battery. If lower, check the stator AC output (typically 20–70 V AC per phase, rising with rpm) and the regulator plug. Disconnect any tracker fitted and measure current draw (<10 mA is normal). |
| Oil weeping from the head cover or clutch cover after the first 500 km | Gaskets settle during break-in; bolts loosen slightly. | Re-torque the cover bolts in a cross pattern to ≈ 10–12 Nm. Persistent leaks: replace the gasket (in the spare-parts kit). |
| Hard gear engagement / false neutrals | Clutch cable stretch after break-in, or wrong oil (car oil with friction modifiers). | Set 10–15 mm free play at the lever; use JASO MA2 motorcycle oil only. |
Fast-moving parts (recommended per 10 units)
| Part | Per 10 units | Note |
|---|---|---|
| Oil filter | 30 | |
| Air filter (foam or paper) | 20 | |
| Spark plug | 10 | |
| Front & rear brake pads (sets) | 10 each | |
| Clutch cable / throttle cable | 5 / 5 | |
| Clutch & brake levers | 10 each | First things broken in a drop |
| Chain 520 (120 links) & sprocket set | 5 sets | |
| Drive chain master link | 10 | |
| Inner tubes 21" & 18" | 10 / 10 | |
| Head-cover & clutch-cover gaskets | 5 / 5 | |
| Fork seals & dust seals | 5 pairs | |
| Mirrors, indicators, hand guards | 5 / 10 / 5 | |
| Radiator fan, thermo-switch | 1 / 2 | |
| Fuel pump assembly | 1–2 | |
| Regulator/rectifier, starter relay | 1–2 / 2 | |
| Plastics set (shrouds, fenders) | 2 sets | Colour-matched, ordered with the bikes |
Tools & safety
Workshop tools
- Metric sockets 8–24 mm, 27 mm & 32 mm for axles
- Torque wrench 5–60 Nm and 40–200 Nm
- Feeler gauges 0.05–0.30 mm and valve-shim kit (7.48 mm shims typical)
- Smart battery charger
- Chain breaker/riveter (520)
- Spoke wrench
- Multimeter
- Generic K-line / OBD-M diagnostic reader for Delphi-type ECUs
Safety notes
- Never run the engine in a closed room; the fan will not keep it cool at idle for long.
- Coolant is toxic and boils under pressure — open the radiator cap only when cold.
- A bike shipped with the front wheel out has its brake caliper hanging free: do not squeeze the front lever before the wheel and disc are fitted.
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