Kawasaki GPZ 400 R (1987–1990) — Specs

Identity

Manufacturer: Kawasaki

Model: GPZ 400 R

Category: Motorcycle

Type: Motorcycle

Years: 1987 → 1990

Engine

Displacement (cc): 399

Cylinders: 4

Power (hp): 27

Power (kW): 20

Torque (Nm): 38

Dimensions

Overall length: 2100 mm

Overall width: 790 mm

Overall height: 1140 mm

Wheelbase: 1430 mm

Ground clearance: 160 mm

Weight (kg): 176

Seat height (mm): 770

Tank (L): 15

Tires

Front tire: 110/70 R17

Rear tire: 150/60 R17

Front pressure (bar): 2

Rear pressure (bar): 2.2

Drivetrain

Drive chain: 520 chain, 104 links

Sprockets (front / rear): 16 / 42

Ignition

Spark plug: NGK DPR8ES

Plug gap: 0.6-0.7 mm

Fluids & Filters

Engine oil: SAE10W-40, API SE

Engine oil (with filter, L): 3

Engine oil (without filter, L): 2.6

Oil filter: Hiflofiltro HF303

Air filter: Hiflofiltro HFA2705

Coolant (L): 1.8

Brake fluid: DOT 4

Fuel consumption

Estimated range: ~375 km on a full tank (15.0 L)

Service

Battery: YTX12-BS

Service interval (km): 6000

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 6,000 km or 12 months, whichever comes first. Valve clearance check every 24,000 km. Valve clearance — intake cold 0.13-0.18 mm, exhaust cold 0.18-0.23 mm. Engine oil: oil grade SAE10W-40, API SE, 3 L with filter change, 2.6 L without filter change. Spark plug: NGK DPR8ES (gap 0.6-0.7 mm). Brake fluid: DOT 4. Coolant capacity: 1.8 L. Chain: 104 links, sprockets 16/42 teeth. Tire pressure: front 2 bar, rear 2.2 bar (cold). Tire size: front 110/70 R17, rear 150/60 R17. 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, API SE, 3.0 L (with filter), 2.6 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

Spec: Hiflofiltro HF303

Premium Hiflofiltro HF303
Premium K&N KN-303

Air filter

Spec: Hiflofiltro HFA2705

Standard Hiflofiltro HFA2705

Spark plug

Spec: NGK DPR8ES, gap 0.6-0.7 mm

OEM NGK DPR8ES
Premium NGK DPR8ESIX
Standard NGK DPR8ES

Front brake pads

Rear brake pads

Drive chain

Spec: 104 links | Sprockets 16/42 teeth / 104 links

Front tire

Spec: 110/70 R17, 2.0 bar

OEM OEM 110/70 R17

Rear tire

Spec: 150/60 R17, 2.2 bar

OEM OEM 150/60 R17

Battery

Premium Yuasa YTX9-BS or YTZ7S (typical 250-500cc)

Brake fluid

Spec: DOT 4

Standard TotalEnergies HBF4

Coolant

Spec: 1.80 L coolant capacity

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: 24 000 km

OEM Intake clearance: cold 0.13-0.18 mm
OEM Exhaust clearance: cold 0.18-0.23 mm

Suspension

Spec: 41 mm telescopic fork / 287 ml SAE 10W-20

OEM Fork: 41 mm telescopic fork
OEM Fork oil grade: 287 ml SAE 10W-20