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Honda CT90 User Manual

Honda CT90
109 pages
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Classic Cycles Technical Resources

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Honda CT90 Specifications

General IconGeneral
Bore x Stroke50.0 mm x 45.6 mm
Compression Ratio8.5:1
Front SuspensionTelescopic fork
Front BrakeDrum
Rear BrakeDrum
Final DriveChain
Tires Front2.50-17
Tires Rear2.50-17
Engine Type4-stroke, single cylinder, OHV
Displacement89 cc
Seat Height780 mm (31 in)
Curb Weight85 kg (187 lbs)
IgnitionMagneto
Rear SuspensionSwingarm with dual shock absorbers

Summary

Equipment and Controls

Speedometer

Identifies the speedometer on the motorcycle.

Front brake lever

Identifies the front brake lever.

Throttle grip

Identifies the throttle grip.

Engine stop switch

Identifies the engine stop switch.

Headlight switch

Identifies the headlight switch.

Rear brake pedal

Identifies the rear brake pedal.

Foot rests

Identifies the foot rests.

Kick starter pedal

Identifies the kick starter pedal.

Turn signal switch

Identifies the turn signal switch.

Handle bar clamp

Identifies the handlebar clamp.

Ignition switch

Identifies the ignition switch.

Gear change pedal

Identifies the gear change pedal.

Instruments and Indicator Lights

Speedometer

Identifies the speedometer.

Odometer

Identifies the odometer.

Neutral indicator light

Identifies the neutral indicator light.

High beam indicator light

Identifies the high beam indicator light.

Turn signal indicator light

Identifies the turn signal indicator light.

Gear speed range indicators

Explains gear speed indicators.

Trip-meter

Identifies the trip-meter.

Trip-meter reset knob

Identifies the trip-meter reset knob.

Ignition Switch

Ignition Switch States

Explains the ON and OFF states of the ignition switch.

Headlight and Engine Stop Switches

Headlight Switch Operation

Details the ON and OFF positions for the headlight switch.

Engine Stop Switch Function

Explains the function and correct placement of the engine stop switch.

Handlebar Controls

Turn Signal Switch Operation

How to operate the turn signal switch for left and right turns.

Headlight Dimmer Switch Operation

How to operate the headlight dimmer switch for low and high beams.

Horn Switch Operation

How to operate the horn switch.

Steering Lock

Steering Lock Operation

How to lock and unlock the motorcycle's steering.

Helmet Holder

Helmet Holder Usage

Instructions for using the helmet holder and warnings.

Fuel and Oil

Fuel Filler Cap

Details on the fuel filler cap, capacity, and fuel type.

Auxiliary Fuel Tank

Auxiliary Fuel Tank Capacity and Mounting

Information on the auxiliary fuel tank's capacity and mounting.

Fuel Valve

Fuel Valve Operation

Instructions for operating the fuel valve (ON, OFF, RES).

Engine Oil

Engine Oil Viscosity and Grade

Guide to selecting the correct engine oil viscosity and grade.

Transporting Tips

Handlebar Position for Transport

How to adjust the handlebar for transporting the motorcycle.

Pre-riding Inspection

Pre-riding Checks

Lists essential checks before riding the motorcycle.

Starting the Engine

Engine Starting Procedure

Step-by-step instructions for starting the engine.

Brake-in Procedure

New Motorcycle Break-in

Guidelines for breaking in a new motorcycle engine.

Riding the Motorcycle

Riding and Shifting Guide

Instructions on operating the throttle, shifting gears, and braking.

High-low speed range selector lever

Selector Lever Operation

How to use the high-low speed range selector lever.

Maintenance

Engine Oil Check

Procedure for checking the engine oil level.

Oil Change and Oil Filter Cleaning

Oil and Filter Maintenance Procedure

Steps for changing engine oil and cleaning the oil filter.

Spark Plug

Spark Plug Specification and Inspection

Details on the specified spark plug and how to inspect it.

Ignition Timing

Ignition Timing Adjustment

Procedure for checking and adjusting ignition timing.

Valve Tappet Clearance

Valve Tappet Clearance Check

How to check valve tappet clearance when the engine is cold.

Valve Tappet Clearance Adjustment

Valve Tappet Clearance Adjustment Procedure

Steps to adjust valve tappet clearance.

Cam Chain Adjustment

Cam Chain Adjustment Procedure

Steps for adjusting the cam chain tension.

Air Cleaner Servicing

Air Cleaner Cleaning Procedure

Instructions for cleaning the air cleaner element.

Throttle Operation

Throttle Grip Operation Check

How to check throttle grip operation and play.

Carburetor Adjustment

Carburetor Adjustment Procedure

Steps for adjusting the carburetor for idle speed and mixture.

Fuel Filter Cleaning

Fuel Filter Cleaning Procedure

Steps for cleaning the fuel filter.

Clutch Adjustment

Clutch Adjustment Procedure

Steps for adjusting the clutch for proper operation.

Drive Chain

Drive Chain Tension Adjustment

How to check and adjust drive chain tension.

Drive Chain Lubrication

How to lubricate the drive chain.

Brakes

Front Brake Adjustment

How to adjust the front brake lever free play.

Rear Brake Adjustment

Rear Brake Adjustment Procedure

How to adjust the rear brake pedal free play.

Brake Wear Indicator

Brake Pad Wear Check

How to check brake pad wear using the indicator.

Front and Rear Suspension Inspection

Suspension Inspection Procedure

Steps for inspecting front and rear suspension components.

Front Wheel Removal

Front Wheel Removal Procedure

Step-by-step guide to removing the front wheel.

Rear Wheel Removal

Rear Wheel Removal Procedure

Step-by-step guide to removing the rear wheel.

Battery Care

Battery Electrolyte Level Check

How to inspect and top up the battery electrolyte level.

Tire Servicing

Tire Pressure and Size Specifications

Recommended tire pressures and sizes.

Stoplight Switch Adjustment

Stoplight Switch Adjustment Procedure

How to adjust the stoplight switch timing.

Tool Kit

Included Tools

Lists the items included in the motorcycle's tool kit.

Wiring Diagram

Specifications

Maintenance Schedule

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