Kawasaki GPZ 305 (chain drive) (1983) — Specs
Identity
Manufacturer: Kawasaki
Model: GPZ 305 (chain drive)
Category: Motorcycle
Type: Motorcycle
Years: 1983 → 1983
Engine
Displacement (cc): 306
Cylinders: 2
Power (hp): 27
Power (kW): 20
Torque (Nm): 25
Dimensions
Overall length: 2070 mm
Overall width: 770 mm
Overall height: 1130 mm
Wheelbase: 1395 mm
Ground clearance: 155 mm
Weight (kg): 164
Tank (L): 17
Tires
Front pressure (bar): 1.8
Rear pressure (bar): 2.2
Drivetrain
Drive chain: 520 chain, 100 links
Sprockets (front / rear): 15 / 37
Ignition
Spark plug: NGK DPR9EA-9
Plug gap: 0.9 mm
Fluids & Filters
Engine oil: SAE10W-40
Engine oil (with filter, L): 1.8
Engine oil (without filter, L): 1.5
Oil filter: OEM oil filter
Air filter: OEM air filter
Brake fluid: DOT 4
Fuel consumption
Estimated range: ~425 km on a full tank (17.0 L)
Service
Battery: OEM battery specification
Service interval (km): 10000
Service interval (months): 12
Valve check (km): 24000
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 10,000 km or 12 months, whichever comes first. Valve clearance check every 24,000 km. Valve clearance — intake cold 0.17-0.22 mm, exhaust cold 0.21-0.26 mm. Engine oil: oil grade SAE10W-40, 1.8 L with filter change, 1.5 L without filter change. Spark plug: NGK DPR9EA-9 (gap 0.9 mm). Brake fluid: DOT 4. Chain: 100 links, sprockets 15/37 teeth. Tire pressure: front 1.8 bar, rear 2.2 bar (cold). 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, 1.8 L (with filter), 1.5 L (without filter)
- OEM OEM recommended engine oil (SAE 10W-40)
- Premium Motul 7100 4T (100% Synthetic, Ester)
- Premium Motul 5100 4T Technosynthese (Semi-Synthetic)
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 (Synthetic)
- Standard Elf Moto 4 Tech (Semi-Synthetic)
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 DPR9EA-9, gap 0.9 mm
- OEM NGK DPR9EA-9
- Premium NGK DPR9EIX-9
- Standard NGK DPR9EA-9
Front brake pads
Spec: EBC FA067HH
- Premium EBC FA067HH
Rear brake pads
Spec: EBC FA067HH
- Premium EBC FA067HH
Drive chain
Spec: 100 links | Sprockets 15/37 teeth / 100 links
- OEM OEM chain (pitch 520 (or 428 for some commuter 250s))
Front tire
Spec: 1.8 bar
Rear tire
Spec: 2.2 bar
Battery
- Premium Yuasa YTX9-BS or YTZ7S (typical 250-500cc)
Brake fluid
Spec: DOT 4
- Standard TotalEnergies HBF4
Coolant
Service interval
Spec: 10 000 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: 24 000 km
- OEM Intake clearance: cold 0.17-0.22 mm
- OEM Exhaust clearance: cold 0.21-0.26 mm
Suspension
Spec: 32 mm telescopic fork / 120 ml SAE 5W-20
- OEM Fork: 32 mm telescopic fork
- OEM Fork oil grade: 120 ml SAE 5W-20
