1987 KTM 250 Manual

The 1987 KTM 250 is a high-performance two-stroke enduro motorcycle featuring a 249cc liquid-cooled engine, 6-speed transmission, hydraulic disc brakes, WP suspension system, and advanced off-road capabilities. This manual covers maintenance procedures, technical specifications, troubleshooting, and operational guidelines for optimal performance and longevity.

Technical Specifications

Complete technical data for the 1987 KTM 250 enduro motorcycle.

Specification	Details
Engine Type	Single cylinder, 2-stroke, liquid-cooled
Displacement	249cc
Bore x Stroke	67mm x 70mm
Compression Ratio	12.5:1
Transmission	6-speed constant mesh
Final Drive	Chain 5/8 x 3/8"
Carburetor	Bing 36mm slide type
Ignition	CDI electronic ignition
Front Suspension	WP USD forks, 300mm travel
Rear Suspension	WP monoshock, 320mm travel

Maintenance Schedule

Regular maintenance intervals for optimal performance and safety.

1. Daily: Check fuel level, tire pressure, chain tension, brake function
2. After 10 hours: Clean air filter, check spark plug, inspect brakes
3. After 20 hours: Change transmission oil, check suspension settings
4. After 50 hours: Replace spark plug, inspect piston and rings
5. After 100 hours: Top end rebuild, wheel bearing inspection

WARNING! Always perform maintenance on cool engine. Use proper safety equipment.

Engine Service

Engine maintenance and repair procedures.

1. Spark Plug: NGK BR8ES, gap 0.5-0.6mm
2. Air Filter: Clean with filter oil every 10 hours
3. Cylinder Head: Torque to 20 Nm in crisscross pattern
4. Piston Replacement: Inspect every 100 hours or as needed
5. Cooling System: Check coolant level, 50/50 mix recommended

CAUTION! Use only genuine KTM parts for engine service.

Chassis & Suspension

• Frame: Chrome-molybdenum steel trellis
• Front Fork: WP 43mm upside-down, adjustable compression/rebound
• Rear Shock: WP PDS monoshock, adjustable preload
• Wheelbase: 1495mm
• Ground Clearance: 370mm
• Seat Height: 960mm
• Fuel Capacity: 9.5 liters
• Dry Weight: 105kg

Electrical System

Complete electrical system specifications and maintenance.

Battery: 12V 4Ah maintenance-free. Generator: 12V 70W AC. Headlight: 35/35W halogen. Tail Light: 5/21W.

Wiring: Color-coded harness with waterproof connectors. Fuses: Main 10A, spare included. Bulbs: Headlight H4, tail light BA15d.

Fuel System

Carburetor settings and fuel mixture specifications.

1. Fuel Type: Premium unleaded 95 octane minimum
2. Oil Mixture: 40:1 with high-quality 2-stroke oil
3. Main Jet: #165 (standard setting)
4. Pilot Jet: #45
5. Needle: N2CH clip position 3

Tip: Adjust jetting for altitude and temperature changes.

Transmission & Clutch

6-speed transmission operation and clutch maintenance.

1. Transmission Oil: SAE 10W-40, 750ml capacity
2. Oil Change Interval: Every 20 operating hours
3. Clutch Type: Wet multi-plate, cable operated
4. Clutch Adjustment: 2-3mm free play at lever
5. Gear Ratios: 1st 13:32, 2nd 16:29, 3rd 19:26, 4th 21:23, 5th 22:21, 6th 23:20

WARNING! Use only recommended transmission oils to prevent damage.

Brake System

Hydraulic disc brake maintenance and service.

Component	Specification
Front Brake	Single disc 260mm, 2-piston caliper
Rear Brake	Single disc 220mm, 1-piston caliper
Brake Fluid	DOT 4, change every 2 years
Pad Thickness	Replace when less than 1.5mm
Rotor Thickness	Front 4.0mm min, rear 3.5mm min

Troubleshooting Guide

Common issues and solutions for the 1987 KTM 250.

Symptom	Possible Cause	Corrective Action
Hard starting	Fouled plug, stale fuel	Replace spark plug, drain old fuel
Poor performance	Clogged air filter, incorrect jetting	Clean air filter, adjust carburetor
Transmission noise	Low oil level, worn gears	Check oil level, inspect transmission
Overheating	Low coolant, lean mixture	Check coolant level, richen mixture
Brake fade	Contaminated fluid, worn pads	Replace fluid and brake pads

Parts & Accessories

Genuine KTM parts and recommended accessories.

Engine Parts: Piston kit, gasket sets, crankshaft. Chassis: Bearings, cables, fasteners. Accessories: Skid plate, handguards, luggage systems.

Warranty Information

Limited warranty coverage and service network details.

Warranty: 6 months from date of purchase for original owner. Coverage: Manufacturing defects in materials and workmanship. Service: Authorized KTM dealers nationwide. For support, contact KTM North America or visit www.ktm.com.