2007 Yamaha YZ250F
General Specifications
| Model | Yamaha YZ250F |
| Year | 2007 |
| Category | Motocross |
| Engine Type | Liquid-cooled, 4-stroke, DOHC, 5-valve single-cylinder |
| Weight | 92.7 kg dry |
Engine
| Displacement | 249 cc |
| Bore x Stroke | 77.0 x 53.6 mm |
| Compression Ratio | 12.5:1 |
| Fuel System | Keihin FCR-MX37 flat-slide carburettor | Replacement Options |
| Ignition | CDI magneto |
| Spark Plug | NGK CR8E resistance type |
| Spark Plug Gap | 0.7-0.8 mm (0.028-0.031 in) |
| Cooling System | Liquid cooled |
| Starting System | Kick starter with automatic decompression |
Transmission
| Transmission | 5-speed constant-mesh |
| Clutch | Wet multi-plate |
| Final Drive | Chain, 13-tooth front / 49-tooth rear sprocket |
Dimensions
| Overall Length | 2,160 mm |
| Overall Width | 825 mm |
| Overall Height | 1,299 mm |
| Wheelbase | 1,469 mm |
| Ground Clearance | 370 mm |
| Seat Height | 984 mm |
| Fuel Capacity | 7.0 L |
Chassis
Suspension
| Front Suspension | 48 mm KYB inverted Speed Sensitive System cartridge fork, fully adjustable | Fork Oil Levels |
| Front Suspension Travel | 300 mm (11.8 in) |
| Rear Suspension | Link-type Monocross with KYB gas/oil shock, adjustable spring preload, compression and rebound damping |
| Rear Suspension Travel | 307 mm (12.1 in) rear wheel travel; shock absorber travel approximately 131.5 mm |
| Fork Oil | Yamaha Suspension Oil S1; damper assembly 195 cc; standard outer chamber oil amount 340 cc per fork with adjustment range 300-380 cc; listed total fork oil capacity 527 cc |
Brakes & Wheels
| Front Brake | Hydraulic single disc, 250 mm |
| Rear Brake | Hydraulic single disc, 245 mm |
| Front Wheel Size | 21 x 1.60 in aluminium spoked wheel |
| Rear Wheel Size | 19 x 1.85 in aluminium spoked wheel |
Service Data
| Fuel Type | Premium unleaded petrol, minimum 95 RON |
| Premix Information | Not applicable - 4-stroke engine |
| Gearbox Oil | Engine and transmission share the same dry-sump engine oil supply; 1.05 L periodic oil change, 1.15 L with oil filter replacement, 1.30 L total capacity. API SG or higher, JASO MA motorcycle oil. |
| Air Filter | Wet-type foam element |
| Service Notes | Dry-sump lubrication. Maintain frequent oil and filter changes, regularly inspect valve clearance, keep the foam air filter clean and correctly oiled, and maintain the FCR carburettor and hot-start system. The 2007 chassis received revised geometry and detail weight reductions compared with the first aluminium-frame 2006 model. |
2007 Yamaha YZ250F: Refining the Aluminium-Frame Formula
The 2007 Yamaha YZ250F was an evolutionary update to the aluminium-framed generation introduced the previous year. Yamaha retained the familiar 249 cc five-valve engine, Keihin FCR-MX37 carburettor, aluminium semi-double-cradle frame and KYB Speed Sensitive System suspension, but concentrated on making the bike feel lighter, turn more precisely and work better as a complete package.
Chassis refinement was the main story. The steering-head position was revised and the rear shock length altered slightly to improve front-end feel and cornering response. Yamaha also removed weight from numerous components, including chassis hardware, axle-related parts and brake components. Dry weight dropped to 92.7 kg, helping the 2007 model feel noticeably more agile than the first aluminium-frame version.
The engine remained mechanically familiar, using a 77.0 x 53.6 mm bore and stroke, 12.5:1 compression ratio and five-speed gearbox. A Keihin FCR-MX37 carburettor continued to handle fuelling, and correct jetting, accelerator-pump operation and hot-start function remain important to how these bikes start and respond. Owners working on the original carburettor can use the MXOwners carburettor reference when checking replacement options.
Suspension remained one of the YZ250F's strongest areas, with a 48 mm KYB Speed Sensitive System fork providing 300 mm of travel and a linkage-operated KYB rear shock providing just over 300 mm of rear wheel movement. Owners servicing the fork can refer to the MXOwners fork oil reference for oil and setup information.
For today's owner, the 2007 model sits in a useful part of YZ250F history: it retained the relatively straightforward carburetted five-valve engine but benefited from a year of development on Yamaha's aluminium chassis. Model-specific chassis, suspension and brake components should still be checked carefully when ordering parts through the MXOwners Parts Finder, while the original tyre sizes can be compared using the MXOwners Tyre Size Guide.
