| Model | Suzuki RM-Z250 |
| Year | 2008 |
| Category | Motocross |
| Engine Type | 249 cc single-cylinder, four-stroke, DOHC, 4-valve, liquid-cooled |
| Weight | Approximately 92.5 kg dry |
| Displacement | 249 cc |
| Bore x Stroke | 77.0 x 53.6 mm |
| Compression Ratio | 13.4:1 |
| Fuel System | Keihin FCR 37 mm flat-slide carburettor with throttle position sensor | Replacement Options |
| Ignition | Digital electronic CDI |
| Spark Plug | NGK CR8E |
| Spark Plug Gap | 0.7-0.8 mm |
| Cooling System | Liquid-cooled |
| Starting System | Primary kick starter with automatic decompression |
| Transmission | 5-speed constant-mesh |
| Clutch | Wet multi-plate |
| Final Drive | #520 chain |
| Overall Length | Approximately 2,170 mm |
| Overall Width | Approximately 830 mm |
| Overall Height | Approximately 1,270 mm |
| Wheelbase | Approximately 1,470 mm |
| Ground Clearance | Approximately 350 mm |
| Seat Height | Approximately 955 mm |
| Fuel Capacity | Approximately 6.5 L |
| Frame | Aluminium twin-spar motocross frame with aluminium swingarm |
| Front Tyre | 80/100-21 51M | Tyre Size Guide |
| Rear Tyre | 100/90-19 57M | Tyre Size Guide |
| Front Suspension | 47 mm Showa inverted twin-chamber cartridge fork, adjustable compression and rebound damping | Fork Oil Levels |
| Front Suspension Travel | 310 mm |
| Rear Suspension | Showa link-type gas-charged monoshock, adjustable spring preload, high/low-speed compression and rebound damping |
| Rear Suspension Travel | 310 mm |
| Fork Oil | Suzuki Fork Oil SS-05 or equivalent high-performance suspension fluid; Showa twin-chamber fork |
| Front Brake | Single hydraulic disc, twin-piston caliper |
| Rear Brake | Single hydraulic disc, single-piston caliper |
| Front Wheel Size | 21 x 1.60 in |
| Rear Wheel Size | 19 x 1.85 in |
| Fuel Type | Premium unleaded petrol, minimum 95 RON |
| Premix Information | Not applicable - four-stroke engine with separate engine lubrication |
| Gearbox Oil | Engine and transmission share the same oil; SAE 10W-40, API SF/SG or SH/SJ with JASO MA specification; approximately 950 ml with oil filter change |
| Air Filter | Washable oiled polyurethane foam element |
| Service Notes | Competition four-stroke motocross machine. Check engine oil frequently and inspect valve clearance, air filter, coolant, clutch, drive chain, brakes and suspension at short competition-service intervals. |
The 2008 Suzuki RM-Z250 was primarily a refinement of the major redesign introduced for 2007. Suzuki retained the aluminium twin-spar frame, 249 cc DOHC four-stroke engine, Keihin FCR carburettor and Showa suspension package, concentrating instead on detail improvements to power delivery, chassis feel and durability.
The engine continued with its 77.0 x 53.6 mm bore and stroke and 13.4:1 compression ratio. Fuel was still supplied by a 37 mm Keihin FCR flat-slide carburettor with a throttle-position sensor, so correct jetting and accelerator-pump setup remained important to throttle response and starting. Owners repairing worn induction components can compare replacement carburettor options.
The aluminium chassis carried over from 2007 and remained one of the biggest differences between this generation and the earlier steel-framed RM-Z250. A 47 mm Showa twin-chamber fork and Showa rear shock provided approximately 310 mm of travel at each end, with extensive damping adjustment for motocross use. The MXOwners fork oil reference is useful when servicing the front suspension.
For owners today, the 2008 RM-Z250 is a straightforward example of Suzuki refining a successful new platform rather than starting over again. It still represents the carburetted era of the RM-Z250 before electronic fuel injection arrived later, and the MXOwners Parts Finder can help when checking replacement components for restoration or race preparation.