Target Audience:
Motocross racers, off-road riders, and DIY owners performing their own service and repairs
Intended Use:
Competition motocross and closed-course off-road riding
Class Competitors:
Honda CR250R, Yamaha YZ250, KTM 250SX
Key Advantage:
Lightweight chassis and strong mid-range two-stroke power delivery
Engine:
249cc liquid-cooled two-stroke with Kawasaki-built powerplant design lineage
Suspension:
Showa fully adjustable front forks and rear shock
Frame:
Chromoly steel perimeter frame
Engine:
Top-end and bottom-end disassembly, inspection, reassembly, piston and cylinder service
Fuel System:
Mikuni carburetor removal, disassembly, jetting, float height adjustment
Cooling System:
Radiator, hoses, coolant replacement, thermostat service
Ignition System:
CDI unit, ignition coil, stator testing and spark inspection
Transmission and Clutch:
Clutch removal, plate inspection, gearshift and transmission service
Lubrication:
Premix ratio specifications and crankcase lubrication checks
Front Suspension:
Fork removal, disassembly, seal replacement, oil level and spring rate settings
Rear Suspension:
Shock removal and linkage bearing service
Wheels and Tires:
Spoke adjustment, wheel bearing replacement, tire service
Brakes:
Front and rear disc brake pad, caliper, and master cylinder service
Frame and Body:
Frame inspection, subframe removal, seat, plastics, and graphics
Electrical:
Wiring diagrams, lighting, and switch testing
Scheduled Maintenance:
Complete periodic maintenance tables and torque specifications
Troubleshooting:
Symptom-based fault diagnosis for engine, carburetion, and chassis
Tune-Up:
Jetting guidance, spark plug selection, and carburetor adjustment
Rebuild Procedures:
Step-by-step engine top-end and bottom-end rebuild instructions
Illustrations:
Detailed diagrams and exploded views for component identification
Specifications:
Factory torque values, clearances, and wear limits
Special Tools:
Special tool callouts and part numbers where required
Skill Level:
From routine maintenance to full engine rebuild
Parts Data:
OEM part references for serviceable components where listed in the manual
Fluid Capacities:
Fork oil, coolant, and transmission oil capacities
Fasteners:
Torque specification tables for critical fasteners
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Primary Engine:
249cc liquid-cooled two-stroke single
Bore and Stroke:
Approximately 66.4 mm x 72.0 mm
Compression Ratio:
Low-pressure crankcase compression typical of two-stroke design
Induction:
Case-reed intake
Lubrication:
Premix (fuel/oil mixture)
Power Character:
Strong mid-to-top-end powerband tuned for motocross use
Fuel System:
Mikuni carburetor with throttle position sensor
Starting:
Primary kick starter
Standard Transmission:
5-speed constant-mesh, chain final drive
Optional Transmission:
N/A - no factory options offered; gearing changes via sprockets
Clutch:
Wet, multi-plate manual clutch
Final Drive:
Chain drive with adjustable axle tension
Gear Pattern:
1-down, 4-up shift pattern
Lubrication:
Transmission oil in separate crankcase cavity
Wheelbase:
Approximately 1,475 mm (58.1 in)
Seat Height:
Approximately 950 mm (37.4 in)
Ground Clearance:
Approximately 335 mm (13.2 in)
Fuel Capacity:
Approximately 8 liters (2.1 US gal)
Curb Weight:
Approximately 91 kg (201 lb) dry weight, curb weight slightly higher
Weight Class:
Lightweight motocross design
Ratings:
N/A - competition motorcycle not subject to consumer crash test ratings
Brakes:
Front and rear hydraulic disc brakes
Control:
Knobby off-road tires and long-travel suspension
Rider Protection:
Rider protection depends on helmet, boots, and full protective gear (not included)
Design:
Competition machine sold for closed-course use only, not street legal
Piston and Rings:
Inspect frequently; top-end rebuild typically every races/season depending on use
Transmission Oil:
Change regularly after heavy use sessions
Coolant:
Replace periodically per manual schedule
Air Filter:
Clean and oil after every ride in dusty conditions
Fuel Delivery:
Premix two-stroke oil with gasoline at manual-specified ratio
Fork Oil:
Showa-specified grade and level per manual
Coolant:
High-quality ethylene glycol antifreeze per manual
Known Issues / Wear Items
Common Wear:
Piston, rings, reeds, clutch plates, fork seals, chain, and sprockets
Maintenance Focus:
Two-stroke engines require more frequent top-end service than four-stroke designs
Manufacturer:
Suzuki Motor Corporation, Japan
RM Lineage:
RM series motocross bikes produced since the mid-1970s
Racing Pedigree:
Developed from Suzuki championship motocross racing program
Model Evolution:
RM250 evolved from earlier RH/RM models with updates to suspension, chassis, and two-stroke engine over successive years
2004 Position:
Late-generation steel-framed RM250 before later chassis and engine updates
Production Location:
Suzuki production facility (Japan; some production sourced from partner plants)
