Honda Z 50 JZ/GZ MONKEY/GORILLA (1979–1985) — Specs
Identity
Manufacturer: Honda
Model: Z 50 JZ/GZ MONKEY/GORILLA
Category: Motorcycle
Type: Motorcycle
Years: 1979 → 1985
Engine
Displacement (cc): 49
Cylinders: 1
Power (hp): 1.8
Power (kW): 1.3
Torque (Nm): 11
Dimensions
Overall length: 1830 mm
Overall width: 700 mm
Overall height: 1090 mm
Wheelbase: 1290 mm
Ground clearance: 115 mm
Weight (kg): 62
Tank (L): 5
Tires
Front tire: 120/80-12
Rear tire: 130/80-12
Front pressure (bar): 1
Rear pressure (bar): 1.2
Drivetrain
Drive chain: 100 links
Sprockets (front / rear): 12 / 40
Ignition
Spark plug: NGK CR6HS
Plug gap: 0.6 mm
Fluids & Filters
Engine oil: SAE10W-40
Engine oil (with filter, L): 0.8
Engine oil (without filter, L): 0.6
Oil filter: OEM oil filter
Air filter: OEM air filter
Fuel consumption
Estimated range: ~200 km on a full tank (5.0 L)
Service
Battery: OEM battery specification
Service interval (km): 6000
Service interval (months): 12
Valve check (km): 12000
Parts and consumables for this motorcycle
Data is gathered with care, but without guarantee. Always confirm critical information with your dealer or workshop.
Service notes
Service interval: every 6,000 km or 12 months, whichever comes first. Valve clearance check every 12,000 km. Valve clearance — intake cold 0.05 mm, exhaust cold 0.05 mm. Engine oil: oil grade SAE10W-40, 0.8 L with filter change, 0.6 L without filter change. Spark plug: NGK CR6HS (gap 0.6 mm). Chain: 100 links, sprockets 12/40 teeth. Tire pressure: front 1 bar, rear 1.2 bar (cold). Tire size: front 120/80-12, rear 130/80-12. Always confirm critical values with the workshop manual or an authorised dealer.
OEM and quality aftermarket parts that fit this bike. Always confirm with your dealer before ordering.
Engine oil
Spec: SAE10W-40, 0.8 L (with filter), 0.6 L (without filter)
- OEM OEM recommended engine oil (SAE 10W-40)
- Premium Motul 7100
- Premium Motul 5100
Which Motul for this bike?
| Motul 7100 4T ✓ | Motul 5100 4T | |
|---|---|---|
| Product | Motul 7100 4T — 100% fully synthetic | Motul 5100 4T — semi-synthetic |
| Best for | Sport, Naked, Adventure (600cc+), track | Standard, Cruiser, Scooter, daily use |
| RPM protection | Excellent — ester base, stable under load | Good — for normal riding conditions |
- Standard Repsol Moto Racing 4T
- Standard Elf Moto 4 Tech
Fully Synthetic vs Semi-Synthetic
| Fully Synthetic | Semi-Synthetic | |
|---|---|---|
| Base oil | 100% chemical synthesis (ester or PAO) | Mineral oil + synthetic additives |
| Heat resistance | Excellent — stable at extreme heat & RPM | Good — suitable for normal temperatures |
| Cold start | Better — reaches engine faster when cold | Good — adequate for normal climates |
| Change interval | Longer (up to 10,000 km) | Shorter (5,000–7,000 km typical) |
| Price | Higher | Lower |
Oil filter
Air filter
Spark plug
Spec: NGK CR6HS, gap 0.6 mm
- OEM NGK CR6HS
- Premium NGK CR6HIX
- Standard NGK CR6HS
Front brake pads
Rear brake pads
Drive chain
Spec: 100 links | Sprockets 12/40 teeth / 100 links
Front tire
Spec: 120/80-12, 1.0 bar
- OEM OEM 120/80-12
Rear tire
Spec: 130/80-12, 1.2 bar
- OEM OEM 130/80-12
Battery
- Premium Yuasa YTX5L-BS or YT4B-BS (typical 50-125cc)
Brake fluid
- Standard TotalEnergies HBF4
Coolant
Service interval
Spec: 6 000 km / 12 months
- OEM Engine oil + oil filter change
- OEM Air filter inspection
- OEM Spark plug check
- OEM Brake fluid replacement: every 2 years
Valve check
Spec: 12 000 km
- OEM Intake clearance: cold 0.05 mm
- OEM Exhaust clearance: cold 0.05 mm
Suspension
Spec: 132 ml
- OEM Fork oil grade: 132 ml
