1987 KX80 Manual

The 1987 Kawasaki KX80 is a high-performance two-stroke motocross motorcycle designed for young riders. Featuring a liquid-cooled 79cc engine, 6-speed transmission, front and rear suspension systems, and lightweight frame construction. Below are key sections for safety, specifications, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Pre-Ride Inspection 3. Starting Procedure 4. Specifications 5. Controls and Operation 6. Maintenance Schedule 7. Carburetor Adjustment 8. Suspension Setup 9. Storage Guidelines 10. Safety Information 11. Troubleshooting

Features at a Glance

Key components: Liquid-cooled 79cc two-stroke engine, 6-speed transmission, front telescopic forks, Uni-Trak rear suspension, front disc brake, rear drum brake.

Feature	Description
Engine Type	Single cylinder, two-stroke, liquid-cooled
Displacement	79cc
Transmission	6-speed constant mesh
Front Suspension	Telescopic fork
Rear Suspension	Uni-Trak system
Front Brake	Hydraulic disc
Rear Brake	Mechanical drum
Fuel Capacity	1.7 gallons
Seat Height	31.5 inches
Dry Weight	148 lbs

Pre-Ride Inspection

Always perform safety check before riding.

Check fuel level and oil mixture (32:1 ratio recommended).
Inspect tires for proper pressure and damage.
Test front and rear brakes for proper operation.
Check chain tension and lubrication.
Verify all controls function properly.

WARNING! Never ride without proper safety gear including helmet, gloves, and protective clothing.

Starting Procedure

Follow proper starting sequence for cold and warm engines.

Turn fuel valve to ON position.
Move choke lever to full choke position (cold starts).
Kick starter firmly through full stroke.
Allow engine to warm up before riding.
Return choke to off position once engine runs smoothly.

CAUTION! Do not operate engine in enclosed spaces due to carbon monoxide danger.

Specifications

Engine: 79cc two-stroke, liquid-cooled
Bore x Stroke: 47.0 x 45.8mm
Compression Ratio: 8.4:1
Carburetor: Mikuni VM24SS
Ignition: CDI electronic
Transmission: 6-speed, wet multi-disc clutch
Frame: Semi-double cradle, steel
Wheelbase: 49.0 inches
Ground Clearance: 11.8 inches

Controls and Operation

Left handlebar: Clutch lever, choke knob, horn button. Right handlebar: Front brake lever, throttle grip, engine stop switch.

Foot Controls: Gear shift lever (left side), rear brake pedal (right side), kick starter.

Instrumentation: Basic warning lights (if equipped). Fuel mixture: Premium unleaded gasoline with two-stroke oil at 32:1 ratio for break-in, 40:1 for normal operation.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

After each ride: Clean air filter, check tire pressure, inspect for damage.
Every 10 hours: Change transmission oil, check spark plug.
Every 20 hours: Clean carburetor, check wheel bearings.
Every 50 hours: Top end inspection, suspension service.

Tip: Keep detailed maintenance records for reference.

Carburetor Adjustment

Mikuni VM24SS carburetor settings for various conditions.

Pilot screw: 1-1/2 turns out from lightly seated position.
Needle clip: Middle position (standard).
Main jet: #120 (standard).
Pilot jet: #30 (standard).
Float level: 18mm measured from carburetor body.

WARNING! Always work in well-ventilated area when handling fuel system components.

Suspension Setup

Adjust suspension for rider weight and riding conditions.

Front forks: Adjust spring preload via fork cap. Rear shock: Adjust spring preload via collars. Recommended settings for 120-140 lb rider: Standard preload settings. For heavier riders: Increase preload 2-3 turns.

Storage Guidelines

Proper storage prevents damage during periods of non-use.

Drain fuel from carburetor and tank. Remove spark plug and add teaspoon of oil to cylinder. Lubricate all cables and pivot points. Store in dry, covered location.

CAUTION! Do not store with fuel in carburetor to prevent varnish buildup.

Safety Information

Always wear DOT-approved helmet, eye protection, gloves, long sleeves, long pants, and over-the-ankle boots. Never ride under influence of alcohol or drugs. Ride within your skill limits. Obey all local laws and regulations.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Hard starting	Fouled spark plug, stale fuel	Replace spark plug, drain old fuel, check compression.
Poor performance	Clogged air filter, carburetor issues	Clean air filter, inspect carburetor jets, check reed valves.
Transmission problems	Low oil level, worn clutch	Check transmission oil level, inspect clutch plates.
Brake issues	Contaminated pads, air in lines	Replace brake pads, bleed hydraulic system.
Overheating	Low coolant, restricted radiator	Check coolant level, clean radiator fins.

Service: Contact authorized Kawasaki dealer for major repairs.

Parts: Use genuine Kawasaki parts for optimal performance and reliability.