The 1988 KTM 250 is a high-performance two-stroke enduro motorcycle featuring a 249cc liquid-cooled engine, 6-speed transmission, WP suspension components, hydraulic disc brakes, and advanced off-road capabilities. This manual covers maintenance procedures, specifications, troubleshooting, and operational guidelines for optimal performance and longevity.
Complete technical data for the 1988 KTM 250 enduro motorcycle.
| Component | Specification |
|---|---|
| Engine Type | Single cylinder, 2-stroke, liquid cooled |
| Displacement | 249 cc |
| Bore x Stroke | 67 x 70 mm |
| Compression Ratio | 12.5:1 |
| Transmission | 6-speed constant mesh |
| Final Drive | Chain 5/8 x 3/8" |
| Front Suspension | WP USD forks, 300mm travel |
| Rear Suspension | WP monoshock, 330mm travel |
| Front Brake | Single disc, 260mm |
| Rear Brake | Single disc, 220mm |
| Fuel Capacity | 9.5 liters |
| Dry Weight | 105 kg |
Proper engine care procedures for optimal performance and longevity.
WARNING! Always allow engine to cool before performing maintenance. Use proper safety equipment.
Frame maintenance and suspension setup procedures.
CAUTION! Use proper torque specifications when tightening chassis components.
Carburetor settings and fuel mixture specifications.
Carburetor: Mikuni VM36SS, main jet 380, pilot jet 40, needle clip position 3
Fuel/Oil Mixture: 40:1 with high-quality 2-stroke oil
Fuel Filter: Clean every 20 hours; replace annually
Throttle Cable: Lubricate monthly; check for smooth operation
Gearbox maintenance and clutch adjustment procedures.
Tip: Always warm up engine before checking clutch adjustment.
Hydraulic disc brake maintenance and service procedures.
WARNING! Test brakes after service before riding. Never reuse brake fluid.
Pre-ride inspection and periodic maintenance intervals.
| Interval | Service Items |
|---|---|
| Before each ride | Check tire pressure, brakes, controls, fuel level |
| Every 10 hours | Clean air filter, check chain tension |
| Every 30 hours | Change transmission oil, check spark plug |
| Every 60 hours | Change fork oil, grease bearings |
| Every 100 hours | Top end rebuild, suspension service |
| Annually | Complete inspection, brake fluid change |
Common issues and their solutions for the 1988 KTM 250.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Hard starting | Fouled plug, stale fuel | Replace spark plug, drain old fuel |
| Poor performance | Clogged air filter, carb issues | Clean air filter, check jetting |
| Transmission noise | Low oil level, worn gears | Check oil level, inspect gears |
| Overheating | Low coolant, water pump failure | Check coolant level, inspect pump |
| Brake fade | Contaminated pads, old fluid | Replace pads, flush brake system |
Always wear proper protective gear including helmet, gloves, boots, and body armor. Never operate motorcycle under influence of drugs or alcohol. Follow all local traffic laws and off-road regulations.
CAUTION! This motorcycle is designed for experienced riders only. High performance requires proper skill and judgment.
Original warranty: 6 months from date of purchase for manufacturing defects. Warranty does not cover normal wear items, abuse, or improper maintenance. Contact authorized KTM dealer for warranty claims. Keep maintenance records for warranty validation.