2008 KTM 250SX-F
General Specifications
| Model | KTM 250 SX-F |
| Year | 2008 |
| Category | Motocross |
| Engine Type | Liquid-cooled single-cylinder four-stroke DOHC, 4 valves |
| Weight | 96.5 kg without fuel |
Engine
| Displacement | 249.5 cc |
| Bore x Stroke | 76.0 x 55.0 mm |
| Compression Ratio | 12.8:1 |
| Fuel System | Keihin FCR-MX 39 mm flat-slide carburettor with accelerator pump | Replacement Options |
| Ignition | Kokusan contactless digital DC-CDI with electronic advance |
| Spark Plug | NGK CR9EBK |
| Spark Plug Gap | 0.70 mm |
| Cooling System | Liquid cooling with mechanically driven water pump; 1.2 L coolant capacity |
| Starting System | Kick starter with automatic decompression |
Transmission
| Transmission | 6-speed constant-mesh, claw-shifted manual |
| Clutch | Wet multi-disc clutch, hydraulically operated |
| Final Drive | Chain, 13:48 standard sprocket ratio |
Dimensions
| Overall Length | |
| Overall Width | |
| Overall Height | |
| Wheelbase | 1475 ± 10 mm |
| Ground Clearance | 380 mm unloaded |
| Seat Height | 925 mm unloaded |
| Fuel Capacity | Approximately 7.2 L |
Chassis
Suspension
| Front Suspension | WP 4860 MXMA CC 48 mm upside-down closed-cartridge fork | Fork Oil Levels |
| Front Suspension Travel | 300 mm |
| Rear Suspension | WP 5018 PDS DCC monoshock with linkless Progressive Damping System |
| Rear Suspension Travel | 335 mm |
| Fork Oil | SAE 5 fork oil |
Brakes & Wheels
| Front Brake | 260 mm hydraulic single disc |
| Rear Brake | 220 mm hydraulic single disc |
| Front Wheel Size | 21 in |
| Rear Wheel Size | 19 in |
Service Data
| Fuel Type | Premium unleaded petrol, minimum 95 RON |
| Premix Information | Not applicable - four-stroke engine |
| Gearbox Oil | Engine and gearbox share lubrication; 1.1 L fully synthetic SAE 10W-50 four-stroke motorcycle oil, JASO MA specification |
| Air Filter | Washable oiled foam element |
| Service Notes | Competition four-stroke requiring frequent engine-oil and filter changes, air-filter servicing and regular checks of valve clearance, cam-chain condition, spark plug, clutch, chain and suspension components. |
2008 KTM 250 SX-F: Refining KTM's High-Revving 250 Four-Stroke
The 2008 KTM 250 SX-F was primarily a refinement of the substantially revised 2007 machine rather than another new generation. KTM retained the compact 249.5 cc DOHC engine, six-speed gearbox, chrome-molybdenum steel chassis and WP PDS suspension package, concentrating on making an already competitive 250F more polished and consistent.
The engine kept its 76.0 x 55.0 mm bore and stroke, 12.8:1 compression ratio and high-revving four-valve cylinder head. Fuel delivery remained through a Keihin FCR-MX 39 mm accelerator-pump carburettor, a defining component of the pre-fuel-injection 250F era. Owners dealing with worn slides, jets or complete carburettors can compare options through the MXOwners carburettor reference.
The chassis continued with KTM's steel frame and linkless WP PDS rear suspension. Up front, the 48 mm WP closed-cartridge fork provided 300 mm of travel, while the rear offered 335 mm. Suspension setup was an important part of getting the best from these machines, and the MXOwners fork oil reference is useful when servicing the original WP front end.
At only 96.5 kg without fuel, the 2008 SX-F remained exceptionally light for a four-stroke motocross bike. Its six-speed transmission, hydraulic clutch and strong Brembo-style disc braking gave it a distinctly KTM character. Historically, the 2008 model represents the maturing phase of KTM's first serious 250F programme, before fuel injection and later chassis changes transformed the class again.
