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General| Displacement | 249cc |
|---|---|
| Bore x Stroke | 66.4mm x 72.0mm |
| Compression Ratio | 8.9~10.6:1 |
| Ignition | CDI |
| Transmission | 5-speed; multiplate wet clutch |
| Final Drive | Chain |
| Front Tire | 80/100-21 |
| Rear Tire | 110/90-19 |
| Wheelbase | 58.3 in |
| Seat Height | 39.1 in |
| Ground Clearance | 14.2 in |
| Fuel Capacity | 2.1 gal |
| Wet Weight | 227 lbs |
| Engine Type | 2-stroke |
| Fuel System | Keihin PWK38S |
| Front Suspension | KYB Speed-Sensitive System inverted fork; fully adjustable |
| Rear Suspension | 12.4-in travel |
| Front Brake | Single disc, 250mm |
| Rear Brake | Hydraulic single disc brake, 245mm |
| Width | 32.5 inches |
Details safety precautions for operating the machine, including competition use, protective apparel, and maintenance.
Explains the operation of various controls like engine stop, clutch, throttle, and brakes.
Covers initial starting procedures and recommended break-in procedures for optimal performance.
Provides key specifications for the YZ250F2 and YZ250 models, including dimensions, weight, and engine details.
Lists standard and limit specifications for engine components like cylinder, piston, and piston rings.
Lists tightening torques for various engine components, including spark plug, cylinder head, and power valve parts.
Provides a schedule for regular inspection and maintenance tasks at specific intervals after break-in and during usage.
Lists general inspection and maintenance items to be checked before riding for break-in, practice, or racing.
Emphasizes the importance of air filter maintenance and outlines the procedure for cleaning and oiling the element.
Guides on adjusting the main jet to achieve the correct air-fuel mixture based on spark plug condition.
Provides examples of carburetor settings based on road conditions, temperature, and altitude.
Correlates engine symptoms like hard breathing or poor response with carburetor adjustments.
Provides a detailed procedure for bleeding the hydraulic brake system to ensure proper braking performance.
Guides on inspecting and replacing the front brake pads, including caliper removal and installation.
Details the procedure for inspecting and replacing the rear brake pads, including caliper removal and installation.
Details how to check and adjust the drive chain slack for proper tension and alignment.
Covers carburetor settings, main jet adjustments, and pilot air screw adjustments.
Explains the role of carburetor settings and how atmospheric conditions affect them.
