Segment:
High-performance professional motocross motorcycle.
Target Audience:
Competitive racers, serious enthusiasts, and professional mechanics.
Competitors:
Yamaha YZ250F, Kawasaki KX250F, KTM 250 SX-F, Suzuki RM-Z250.
Design Philosophy:
Focused on lightweight design, powerful engine, and agile handling for competitive racing.
Advantages:
Renowned Honda build quality, strong low-to-mid range power delivery, excellent chassis balance.
Primary Coverage:
Complete Service and Repair Procedures
Secondary Coverage:
Maintenance, Troubleshooting, Diagnostics, Rebuilds, Electrical Systems, Bodywork
Estimated Pages:
Likely 300-500+ pages (typical for a complete workshop manual)
Type:
Workshop Service Repair Manual
Engine:
Complete overhaul, cylinder head, piston, crankshaft, lubrication, cooling system, fuel injection system (PGM-FI), ignition system.
Transmission:
Clutch, gearbox, shift mechanism, final drive.
Chassis:
Frame, front suspension (forks), rear suspension (shock absorber, swingarm, linkage), steering system.
Brakes:
Front and rear brake systems, hydraulic lines, calipers, master cylinders, rotors.
Electrical:
Wiring diagrams, battery, charging system, ignition coil, starter system, lighting (if applicable for specific models/regions), sensor diagnostics.
Bodywork:
Fairings, seat, fuel tank, fenders, controls.
Maintenance:
Oil changes, filter replacements, chain adjustment, air filter cleaning, spark plug service, valve clearance adjustment, brake fluid replacement, coolant replacement.
Repair:
Engine rebuilds, transmission repairs, suspension overhaul, brake caliper rebuilds, electrical component replacement, body panel repair/replacement.
Troubleshooting:
Step-by-step diagnostic procedures for common and uncommon issues, fault code interpretation (for PGM-FI).
Depth:
Comprehensive from basic preventative maintenance to full engine and chassis teardowns and rebuilds.
Diagnostics:
Detailed diagnostic procedures for the PGM-FI system and other electrical components.
File Type:
Portable Document Format (PDF)
Searchability:
Searchable text content for quick information retrieval.
Printability:
Printable by chapter or in its entirety.
Image Quality:
High-quality images and diagrams for clear visual guidance.
Binding:
Not applicable (digital download)
Paper:
Not applicable (digital download)
Engine Type:
Liquid-cooled, four-stroke, single-cylinder, Unicam OHC.
Bore X Stroke:
78.0 mm x 52.2 mm
Compression Ratio:
13.5:1 (typical for this generation)
Horsepower Estimated:
Approximately 40-42 HP (at crankshaft)
Torque Estimated:
Approximately 18-19 lb-ft (at crankshaft)
Fuel Delivery:
Programmed Fuel Injection (PGM-FI) with 44mm throttle body.
Fuel Type:
Unleaded premium gasoline (91 octane or higher recommended).
Oil Type:
SAE 10W-30 API SG or higher, JASO MA certified motorcycle oil.
Oil Capacity:
Approximately 1.15 L (0.12 US qt) without filter change, 1.25 L (0.13 US qt) with filter change.
Transmission Type:
Constant-mesh, 5-speed manual.
Optional Gearboxes:
N/A (standard 5-speed for this model).
Clutch Type:
Wet, multi-plate, cable-actuated.
Final Drive:
#520 O-ring-sealed chain, 13T front sprocket, 48T rear sprocket (stock configuration).
Length:
Approx. 81.9 inches (2080 mm)
Width:
Approx. 32.3 inches (820 mm)
Height:
Approx. 50.0 inches (1270 mm)
Wheelbase:
Approx. 58.1 inches (1475 mm)
Curb Weight:
Approx. 232 lbs (105.2 kg)
Dry Weight:
Approx. 216 lbs (98.0 kg)
Fuel Tank Capacity:
1.7 U.S. gallon (6.4 Liters)
Safety Ratings:
N/A (Off-road competition vehicle, not subject to road safety regulations)
Braking System:
Hydraulic dual-piston front caliper with 260mm disc, hydraulic single-piston rear caliper with 240mm disc.
Suspension Features:
Fully adjustable Showa Separate Function Front Fork (SFF) with 310mm travel, fully adjustable Showa Pro-Link rear shock with 310mm travel.
Frame Construction:
Twin-spar aluminum alloy frame for rigidity and light weight.
Infotainment System:
N/A (This is a competition motocross bike, no infotainment system.
Assistance Features:
N/A (Off-road competition bike, no electronic rider aids like ABS or traction control.)
Connectivity Features:
N/A
Fuel Injection System:
Honda's PGM-FI system allows for precise fuel and ignition timing control, adapting to various riding conditions and optimizing performance. Features dual fuel injectors for improved atomization.
Engine Oil Change:
Every 10-15 hours of riding under normal conditions, or as per manual recommendations.
Air Filter Cleaning:
After every few rides, or more frequently in dusty conditions.
Valve Clearance Check:
Every 20-30 hours of riding (crucial for performance and longevity).
Spark Plug Inspection:
Every 15-20 hours of riding.
Chain Lubrication Adjustment:
Every ride or as needed.
Coolant Type:
Honda Motorcycle Coolant or equivalent (50/50 mixture of antifreeze and distilled water).
Brake Fluid Type:
DOT 4 Brake Fluid.
Common Wear Items:
Clutch plates, spark plugs, air filter, chain and sprockets, piston rings, valve seats (especially with aggressive use).
Potential Failures:
While generally reliable, improper maintenance or over-revving can lead to premature wear of internal engine components. PGM-FI system requires proper diagnostics if issues arise.
Heritage:
Honda has a long and storied history in motocross, with the CRF line representing their commitment to competitive off-road performance.
Generation Overview:
The CRF250R has consistently evolved, focusing on engine power delivery, chassis dynamics, and suspension technology to remain competitive in the 250cc four-stroke class.
Key Updates 2014-2017:
This generation (MD38) saw significant updates, including refined engine tuning for better power delivery, chassis enhancements for improved handling, and updated suspension settings. The 2016 model introduced changes to the engine mapping and chassis rigidity.
Manufacturing Location:
Japan
