Honda CG125 (JC30 OHV) — OEM Fluid, Tire Pressure & Maintenance Specs
124cc Air-Cooled Vertical Single Pushrod OHV 2V 5-Speed · Source: Honda CG125 (JC30 OHV) (1998–2008) Official Owner’s Manual Maintenance Specifications
According to the Honda CG125 (JC30 OHV) (1998–2008) Official Owner’s Manual Maintenance Specifications, the 1998–2008 Honda CG125 (JC30 OHV) (chassis JC27/JC30) requires 0.9 L (0.95 US qt) of SAE 10W-30 (JASO MA, API SJ or higher) engine oil for a drain-only change and 0.9 L (0.95 US qt) with filter service (15421-107-000 (Mesh Thimble Screen)). Standard solo cold tire pressure is 175 kPa / 1.75 bar / 25 PSI front (2.75-18 42P) and 200 kPa / 2.00 bar / 29 PSI rear (90/90-18 57P), paired with 1× NGK DPR8EA-9 spark plug(s) and a YTZ5S battery.
Drain only: 0.9 L (0.95 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~585 km (364 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-30 (Alt: SAE 10W-40) · JASO MA · API SJ or higher |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 0.9 L (0.95 US qt) • With filter/strainer: 0.9 L (0.95 US qt) • Complete dry overhaul: 1.1 L (1.16 US qt) |
| OEM Oil Filter Code & Type | 15421-107-000 (Mesh Thimble Screen) |
| Correct Oil Level Check Method | Hold upright on level ground; rest dipstick UNTHREADED on filler neck (do NOT screw in) |
| Oil Drain Bolt Torque | 24 N·m (17.7 lb-ft / 2.45 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 2.75-18 42P · Rear: 90/90-18 57P (Tube-Type Spoke Rim) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 175 kPa / 1.75 bar / 25 PSI Rear: 200 kPa / 2.00 bar / 29 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 175 kPa / 1.75 bar / 25 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK DPR8EA-9 × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ5S (12V 3.5Ah MF AGM) |
| Final Drive Maintenance | 428 Drive Chain — Maintain 20–30 mm slack and lubricate regularly |
| Brake Fluid & Coolant | DOT 4 · Air/Oil-Cooled Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 124 cc · 11 hp @ 8,500 rpm · 9.8 N·m (7.2 lb-ft) @ 7,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 790 mm (31.1 in) · 115 kg (254 lbs) |
| Fuel Tank & Est. Real-World Range | 13 L (3.4 US gal) · ~45 km/L → ~585 km (364 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 6,000 km / 12,000 km • Air Filter / Spark Plug: 16,000 km / 12,000 km • Valve Clearance Check: 8,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Legendary pushrod OHV commuter engineered to eliminate cam-chain stretch under poor oil maintenance; late JC30 Euro models added electric start and a front disc brake.
Oil & Clutch Mechanical Engineering Note
Honda air-cooled manual-clutch mini-moto single requiring SAE 10W-30 JASO MA oil and periodic filter/centrifugal spinner service.