Honda Monkey 50 FI (Z50J / AB27) — OEM Fluid, Tire Pressure & Maintenance Specs
49cc Air-Cooled Horizontal Single SOHC 2V 4-Speed Manual · Source: Honda Monkey 50 FI (Z50J / AB27) (2009–2017) Official Owner’s Manual Maintenance Specifications
According to the Honda Monkey 50 FI (Z50J / AB27) (2009–2017) Official Owner’s Manual Maintenance Specifications, the 2009–2017 Honda Monkey 50 FI (Z50J / AB27) (chassis AB27) requires 0.6 L (0.63 US qt) of SAE 10W-30 (JASO MA, API SJ or higher) engine oil for a drain-only change and 0.6 L (0.63 US qt) with filter service (15421-035-010 (Screen + Spinner)). Standard solo cold tire pressure is 125 kPa / 1.25 bar / 18 PSI front (3.50-8 35J) and 125 kPa / 1.25 bar / 18 PSI rear (3.50-8 35J), paired with 1× NGK CR6HSA spark plug(s) and a YTR4A-BS battery.
Drain only: 0.6 L (0.63 US qt)
R 125 kPa (1.25 bar)
Est. Range: ~280 km (174 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: 0.6 L (0.63 US qt) • With filter/strainer: 0.6 L (0.63 US qt) • Complete dry overhaul: 0.7 L (0.74 US qt) |
| OEM Oil Filter Code & Type | 15421-035-010 (Screen + Spinner) |
| 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: 3.50-8 35J · Rear: 3.50-8 35J (Tube-Type Spoke Rim) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 125 kPa / 1.25 bar / 18 PSI Rear: 125 kPa / 1.25 bar / 18 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 125 kPa / 1.25 bar / 18 PSI Rear: 125 kPa / 1.25 bar / 18 PSI |
| OEM Spark Plug & Quantity | NGK CR6HSA × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTR4A-BS (12V 3.5Ah MF AGM) |
| Final Drive Maintenance | 428 Drive Chain — Maintain 20–30 mm slack and lubricate regularly |
| Brake Fluid & Coolant | Mechanical Drum · Air/Oil-Cooled Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 49 cc · 3.4 hp @ 8,500 rpm · 3.4 N·m (2.5 lb-ft) @ 5,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 660 mm (26.0 in) · 68 kg (150 lbs) |
| Fuel Tank & Est. Real-World Range | 4.3 L (1.1 US gal) · ~65 km/L → ~280 km (174 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
Final fuel-injected AB27 chapter (2009–2017) of Honda’s original folding-bar 8-inch Z50 Monkey, weighing just 68 kg wet before the 12-inch Monkey 125 arrived.
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.