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Honda · Overhead-cam four-stroke twin, wet sump, gearbox shares engine oil, chain drive

NT650 Hawk GT

Library entry covers 1988-1991

26 factory 34 guideline

Published source

Honda Hawk GT NT650 1988 Service Manual (Honda Motor Co.), Maintenance Schedule p.3-3

Factory service manual. Covers 1988-1991 NT650 Hawk GT (US), service manual chart in mi and km.

60 items for a 1989 model, grouped by interval the way a factory chart is laid out.

How this bike is built (what the schedule is based on)

Engine cycle: Four-stroke
Engine lubrication: Wet sump (oil in crankcase)
Oil filtration: Replaceable cartridge or spin-on filter
Valve gear: Overhead cam, screw/locknut adjusters
Ignition: Electronic (CDI / transistor / ECU)
Charging: Alternator / stator with rectifier
Battery: Wet cell (flooded lead-acid, needs topping up)
Fuel system: Two or more carburetors
Cooling: Liquid cooled
Primary drive: Gear or chain inside engine, shares engine oil
Gearbox oil: Shares engine oil
Clutch control: Hand lever, cable
Final drive: Chain
Front suspension: Telescopic fork
Rear suspension: Swingarm, single shock / cantilever
Front brake: Disc, hydraulic
Rear brake: Disc, hydraulic
Wheels: Cast / alloy, tubeless
Sidecar: No sidecar

Maintenance schedule

1989 Honda NT650 Hawk GT

On the road: every 300 km

1 item

Check engine oil level

Pre-ride / on the road

Guideline

Each fuel stop on old machines. Dry sump: check the tank hot, engine idling or just stopped, per your manual.

On the road: every 500 km

2 items

Check lights, horn, brake light switches

Pre-ride / on the road

Guideline
Check tire pressures

Pre-ride / on the road

Guideline

On the road: every 800 km

1 item

Check coolant level

Pre-ride / on the road

Guideline

On the road: every 1,000 km

2 items

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline
Lubricate drive chain

Pre-ride / on the road

Factory

Manual: Drive chain: inspect and lubricate. Factory: Maintenance schedule p.3-3: every 600 mi (1,000 km)

Every 1,600 km or 1 month

1 item

Check battery electrolyte, top up with distilled water

Ignition and electrics

Guideline

Wet-cell batteries on old machines need regular topping up, more in hot weather.

Every 5,000 km or 12 months

7 items

Clean / inspect air filter

Fuel and air

Guideline

Mesh or oiled foam: clean and re-oil. Paper: blow out or replace. Some very early machines have no filter at all.
Clean fuel tap filter / sediment bowl

Fuel and air

Guideline
Clean drive chain thoroughly (remove and soak, re-lube)

Final drive

Guideline

Non O-ring chains on old machines: remove, clean, soak in hot chain grease or lube, refit with the master link clip closed end leading.
Inspect chain and sprockets for wear (measure stretch)

Final drive

Guideline
Inspect fork seals, stanchions and fork boots

Front end

Guideline
Check footrests, pegs, rear brake and gear lever pivots

Rear suspension and frame

Guideline
Check wheel bearings for play

Wheels and tires

Guideline

Every 6,400 km

6 items

Check engine breather and oil return

Engine

Factory

Manual: Crankcase breather: clean. Factory: Maintenance schedule p.3-3: more often in rain or at full throttle
Replace spark plugs

Engine

Factory

Manual: Spark plugs: replace. Factory: Maintenance schedule p.3-3
Carburetor-idle speed: inspect

Fuel and air

Factory

Factory: I at 600 mi and every 4,000 mi. Columns 600 mi (1,000 km), then every 4,000 mi (6,400 km) to 24,000 mi (38,400 km); note 1: at higher odometer readings repeat at the frequency interval established here. (Read from the page image, ManualsLib Honda Hawk GT NT650 1988 service manual maintenance schedule.)
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Factory

Manual: Clutch system: inspect. Factory: Maintenance schedule p.3-3: first at 600 mi
Check brake pads and discs

Brakes

Factory

Manual: Brake pad wear: inspect. Factory: Maintenance schedule p.3-3
Inspect tire tread, sidewalls and date codes

Wheels and tires

Factory

Manual: Wheels and tires: inspect. Factory: Maintenance schedule p.3-3: dealer only; first at 600 mi

Every 6,500 km or 12 months

1 item

Inspect, clean and gap spark plugs

Engine

Guideline

Every 9,500 km or 12 months

5 items

Clean carburetor float bowl(s), check float level and jets

Fuel and air

Guideline

Ethanol fuel varnishes old carbs quickly in storage.
Check charging voltage and regulator / cut-out

Ignition and electrics

Guideline
Check swingarm bushes for play

Rear suspension and frame

Guideline
Lubricate control cables and lever pivots

Controls and cables

Guideline
Lubricate speedometer / tachometer cables, check drive

Controls and cables

Guideline

A dry speedo cable whips the needle and eventually kills the instrument.

Every 12,800 km

15 items

Walk-around: check nuts and bolts for vibration loosening

Pre-ride / on the road

Factory

Manual: Nuts, bolts, fasteners: inspect. Factory: Maintenance schedule p.3-3: dealer item; first at 600 mi
Change engine oil

Engine

Factory

Manual: Engine oil: replace. Factory: Maintenance schedule p.3-3: first at 600 mi (1,000 km)
Check and adjust valve clearances

Engine

Factory

Manual: Valve clearance: inspect. Factory: Maintenance schedule p.3-3: dealer item; first at 600 mi (1,000 km)
Headlight aim: inspect

Engine

Factory

Factory: I at 8,000, 16,000 and 24,000 mi. Columns 600 mi (1,000 km), then every 4,000 mi (6,400 km) to 24,000 mi (38,400 km); note 1: at higher odometer readings repeat at the frequency interval established here. (Read from the page image, ManualsLib Honda Hawk GT NT650 1988 service manual maintenance schedule.)
Inspect coolant hoses and clamps

Engine

Factory

Manual: Cooling system: inspect. Factory: Maintenance schedule p.3-3: dealer item; secondary air supply at the same interval; evaporative emission system (California) every 12,000 mi
Replace oil filter

Engine

Factory

Manual: Engine oil filter: replace. Factory: Maintenance schedule p.3-3: first at 600 mi (1,000 km)
Secondary air supply system: inspect

Engine

Factory

Factory: I at 8,000, 16,000 and 24,000 mi. Printed with (NOTE 5): replace every 2 years, or at indicated odometer interval, whichever comes first. Columns 600 mi (1,000 km), then every 4,000 mi (6,400 km) to 24,000 mi (38,400 km); note 1: at higher odometer readings repeat at the frequency interval established here. (Read from the page image, ManualsLib Honda Hawk GT NT650 1988 service manual maintenance schedule.)
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Throttle operation: inspect. Factory: Maintenance schedule p.3-3: dealer item; carburetor choke at the same interval
Replace fuel lines

Fuel and air

Factory

Manual: Fuel line: inspect. Factory: Maintenance schedule p.3-3: dealer item
Synchronize carburetors

Fuel and air

Factory

Manual: Carburetor synchronization: inspect. Factory: Maintenance schedule p.3-3: dealer item; first at 600 mi; idle speed every 4,000 mi
Check steering head bearing adjustment

Front end

Factory

Manual: Steering head bearings: inspect. Factory: Maintenance schedule p.3-3: dealer only; first at 600 mi
Grease and check center / side stand and springs

Rear suspension and frame

Factory

Manual: Side stand: inspect. Factory: Maintenance schedule p.3-3
Inspect rear shocks for leaks and damping

Rear suspension and frame

Factory

Manual: Suspension: inspect. Factory: Maintenance schedule p.3-3: dealer item
Brake light switch: inspect

Brakes

Factory

Factory: I at 8,000, 16,000 and 24,000 mi. Columns 600 mi (1,000 km), then every 4,000 mi (6,400 km) to 24,000 mi (38,400 km); note 1: at higher odometer readings repeat at the frequency interval established here. (Read from the page image, ManualsLib Honda Hawk GT NT650 1988 service manual maintenance schedule.)
Inspect brake hoses; replace old rubber

Brakes

Factory

Manual: Brake system: inspect. Factory: Maintenance schedule p.3-3: first at 600 mi; brake light switch and headlight aim every 8,000 mi

Every 16,000 km or 2 years

2 items

Compression test (or leak-down)

Engine

Guideline
Change fork oil

Front end

Guideline

Some early telescopic forks are grease filled or use very small oil quantities. Check your manual.

Every 19,200 km or 2 years

1 item

Replace brake fluid

Brakes

Factory

Manual: Brake fluid: replace. Factory: Maintenance schedule p.3-3: every 2 years or 12,000 mi; inspect every 4,000 mi

Every 19,200 km

2 items

Replace air filter element

Fuel and air

Factory

Manual: Air cleaner: replace. Factory: Maintenance schedule p.3-3: more often in unusually wet or dusty areas
Evaporative emission control system: inspect

Controls and cables

Factory

Factory: I at 12,000 and 24,000 mi. Note 4: California model only. Columns 600 mi (1,000 km), then every 4,000 mi (6,400 km) to 24,000 mi (38,400 km); note 1: at higher odometer readings repeat at the frequency interval established here. (Read from the page image, ManualsLib Honda Hawk GT NT650 1988 service manual maintenance schedule.)

Every 19,500 km or 2 years

2 items

Clean and grease rear suspension linkage

Rear suspension and frame

Guideline
Grease swingarm pivot

Rear suspension and frame

Guideline

Every 29,000 km

1 item

Replace chain and sprockets (wear based)

Final drive

Guideline

Every 32,000 km or 4 years

2 items

Repack / replace steering head bearings

Front end

Guideline

Many old machines use loose balls in cups and cones. Taper roller conversions are common.
Repack / replace wheel bearings

Wheels and tires

Guideline

Cup-and-cone and taper roller hubs need periodic repacking and adjustment.

Every 38,400 km or 2 years

1 item

Replace coolant

Engine

Factory

Manual: Radiator coolant: replace. Factory: Maintenance schedule p.3-3: every 2 years or 24,000 mi; inspect every 8,000 mi

Every 40,000 km or 6 years

1 item

Replace swingarm bushes / bearings

Rear suspension and frame

Guideline

Every 48,500 km or 6 years

1 item

Rebuild forks: seals, bushes, springs

Front end

Guideline

Every 6 months

1 item

Clean battery terminals, check charge and strap

Ignition and electrics

Guideline

Every 12 months

1 item

Check speedometer / odometer against a known distance

Controls and cables

Guideline

Old speedos drift with tire size and drive wear. Use phone GPS over a measured 10 miles / km.

Every 2 years

2 items

Inspect wiring, bullet connectors and ground points

Ignition and electrics

Guideline
Inspect frame, welds and lugs for cracks

Rear suspension and frame

Guideline

Every 4 years

1 item

Rebuild calipers and master cylinders (seals)

Brakes

Guideline

Every 6 years

1 item

Replace tires on age (regardless of tread)

Wheels and tires

Guideline

Guideline lines: Intervals here are general guidelines for the machine's era and layout, compiled for this app. They are not factory manual figures. Check your workshop manual, and edit any interval in the bike's Schedule tab.