1987 Honda CH150 Service Manual

The 1987 Honda CH150 is a 150cc scooter featuring liquid-cooled single-cylinder engine, automatic transmission, front and rear disc brakes, comprehensive electrical system, and advanced suspension. This service manual covers maintenance procedures, specifications, troubleshooting, and repair instructions for proper servicing and maintenance of your Honda CH150 scooter.

1. General Information 2. Specifications 3. Periodic Maintenance 4. Engine Service 5. Fuel System 6. Electrical System 7. Chassis 8. Brake System 9. Troubleshooting 10. Wiring Diagrams

General Information

This manual provides detailed service information for the 1987 Honda CH150 scooter. Includes identification numbers, safety precautions, and general maintenance guidelines.

Component	Description
Model	CH150 Elite 150 Deluxe
Engine Type	Liquid-cooled 4-stroke OHC single cylinder
Displacement	149cc
Transmission	Automatic V-Matic
Frame Type	Steel tube underbone
Overall Length	1985 mm (78.1 in)
Overall Width	685 mm (27.0 in)
Overall Height	1135 mm (44.7 in)
Wheelbase	1320 mm (52.0 in)
Seat Height	735 mm (28.9 in)

Specifications

Engine: 149cc liquid-cooled 4-stroke single cylinder
Bore x Stroke: 57.0 x 57.8 mm
Compression Ratio: 10.5:1
Carburetor: VE26A
Ignition System: CDI electronic ignition
Starting System: Electric and kick starter
Lubrication System: Forced pressure and wet sump
Fuel Capacity: 9.5 liters (2.5 US gal)
Oil Capacity: 1.0 liter (1.1 US qt) at change
Transmission Oil: 190 ml (0.20 US qt)
Front Tire: 100/90-10 56J
Rear Tire: 100/90-10 56J

Periodic Maintenance

Regular maintenance schedule and procedures to ensure optimal performance and longevity.

Engine Oil: Change every 4,000 km or 6 months
Oil Filter: Replace every other oil change
Air Filter: Clean every 8,000 km, replace every 16,000 km
Spark Plug: Clean and adjust every 8,000 km, replace every 16,000 km
Valve Clearance: Check every 8,000 km
Brake Fluid: Replace every 2 years
Brake Pads: Check every 4,000 km
Drive Belt: Inspect every 8,000 km, replace every 16,000 km

WARNING! Always use genuine Honda parts and recommended fluids. Follow torque specifications precisely.

Engine Service

Complete engine disassembly, inspection, and reassembly procedures.

Service	Specification
Compression Pressure	1,275 kPa (13.0 kg/cm², 185 psi)
Valve Clearance (Cold)	IN: 0.10 mm (0.004 in), EX: 0.12 mm (0.005 in)
Spark Plug	NGK CPR7EA-9 or ND U22FSR-U9
Spark Plug Gap	0.8-0.9 mm (0.031-0.035 in)
Idle Speed	1,600 ± 100 rpm
Oil Pressure	30-50 kPa (0.3-0.5 kg/cm², 4.3-7.1 psi) at idle

CAUTION! Engine components are precision parts; handle with care and use proper tools.

Fuel System

Carburetor service, fuel pump maintenance, and fuel system troubleshooting.

Carburetor float level: 12.5 mm (0.49 in)
Main jet: #88
Slow jet: #35
Fuel pump pressure: 1.96-2.45 kPa (0.02-0.025 kg/cm², 0.28-0.36 psi)
Throttle grip freeplay: 2-6 mm (0.08-0.24 in)

Tip: Always drain fuel system before extended storage to prevent carburetor clogging.

Electrical System

Battery, charging system, ignition, lighting, and instrument cluster service.

Battery: 12V 8Ah
Charging System: AC generator
Regulator/Rectifier: Shunt type
Headlight: 12V 35/35W
Brake/Tail Light: 12V 21/5W
Turn Signal: 12V 10W
Fuses: Main 15A, Signal 10A, Headlight 10A

Chassis

Frame, suspension, wheels, and steering maintenance procedures.

Component	Specification
Front Fork Oil	ATF Dexron II, 135 ml (4.6 US oz) each fork
Front Fork Spring Free Length	252.5 mm (9.94 in)
Rear Shock Spring Free Length	218.5 mm (8.60 in)
Steering Head Bearing	Tapered roller bearing
Wheel Runout Limit	Axial: 2.0 mm (0.08 in), Radial: 2.0 mm (0.08 in)

Brake System

Front and rear disc brake service, bleeding procedures, and pad replacement.

Front brake disc thickness: 3.5 mm (0.14 in) standard, 3.0 mm (0.12 in) service limit
Rear brake disc thickness: 4.5 mm (0.18 in) standard, 4.0 mm (0.16 in) service limit
Brake pad thickness: 4.0 mm (0.16 in) standard, 2.0 mm (0.08 in) service limit
Brake fluid: DOT 3 or DOT 4
Master cylinder bore: 11.0 mm (0.43 in)
Caliper cylinder bore: 30.2 mm (1.19 in)

WARNING! Always use fresh brake fluid and avoid contamination. Test brakes before riding.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Engine won't start	Fuel, spark, compression	Check fuel flow, spark plug, compression, carburetor
Poor acceleration	Clutch, belt, carburetor	Inspect drive belt, clutch springs, carburetor jets
Electrical failure	Battery, fuses, connections	Test battery voltage, check fuses, clean connections
Brake drag	Caliper, master cylinder	Clean caliper pistons, check master cylinder return
Overheating	Coolant, thermostat, radiator	Check coolant level, thermostat operation, radiator fins
Transmission slip	Drive belt, clutch	Inspect belt wear, clutch operation, variator weights

Service Note: Always diagnose systematically from simplest to most complex causes.

Wiring Diagrams

Complete electrical schematics for the 1987 Honda CH150. Includes color-coded wiring, connector locations, and ground points.

Main harness routing and connector identification
Ignition system circuit diagram
Charging system testing procedures
Lighting circuit specifications
Instrument cluster wiring
Starter circuit troubleshooting

CAUTION! Disconnect battery before performing electrical work to prevent short circuits.