CPI Supermoto 50cc – General Information

The CPI Supermoto 50cc has established itself as a supermoto that combines sporty design with reliable technology. The SMSX model was produced between 2005 and 2015 and was particularly popular for its agile handling and versatility in city traffic as well as on cross-country rides. The reinforced frame and optimized weight distribution make it a balanced choice for riders seeking maneuverability without sacrificing comfort.

CPI Supermoto SM 50 (2005–2015)

Engine and Performance

The CPI is powered by a liquid-cooled single-cylinder two-stroke engine, delivering 2.2 kW (3 hp) at 7,000 rpm and a torque of 3.9 Nm at 4,000 rpm. Liquid cooling ensures stable operating temperatures even during intensive use in the city. The reed valve intake system optimizes engine charging and ensures balanced, predictable handling. With a displacement of 49cc, the engine was designed to offer maximum performance within legal limits.

• Displacement: 49cc
• Bore x Stroke: 40 x 39 mm
• Carburetor: Dell'Orto PHVA16 or Mikuni Ø16 (depending on the model)
• Compression ratio: 11:1
• Combustion pressure: 9.8 bar

Drivetrain and Handling

Power transmission is handled via a multi-plate wet clutch and a 6-speed gearbox, allowing for precise control. The gearing ranges from a very short first gear (3.05) for a snappy start at city lights to a long sixth gear (0.96) for relaxed riding on open roads, so you can perfectly adapt the moped to any situation.

• Drivetrain: Multi-plate clutch | 6-speed manual gearbox
• Gear ratio range: 3.05 (1st gear) to 0.96 (6th gear)

Chassis and Safety

The tubular steel frame offers the mix of rigidity and agility typical of supermotos. The hydraulic telescopic fork provides good damping and control during braking, while the rear shock absorber absorbs bumps and keeps the bike stable. Hydraulic disc brakes guarantee easily modulated braking power. The 17-inch alloy wheels offer the ideal balance of directional stability and maneuverability.

• Suspension:
  • Front: Hydraulic telescopic fork, 240 mm travel
  • Rear: Swingarm with shock absorber, 30 mm travel
• Brakes: Hydraulic wave discs DOT 4 | 270 mm (front) | 210 mm (rear)
• Wheels: 17-inch aluminum | Tires 110/80-17 / 130/70-17

Dimensions and Weight

With a length of 1,955 mm and a dry weight of only 92 kg, the CPI Supermoto scores with a top power-to-weight ratio that underlines its nimble handling.

• L x W x H: 1,955 x 790 x 1,185 mm
• Dry weight: 92 kg
• Wheelbase: 1,338 mm
• Seat height: 920 mm

Maintenance and Care

To keep the engine running optimally, you should use fully synthetic two-stroke oil (1 liter tank), SAE 15W fork oil (315 ml per leg), and the appropriate gearbox oil (650 ml).

• Fuel: Unleaded min. 91 RON
• Tank capacity: 6.8 liters
• Engine oil: Fully synthetic 2T oil (1 liter)
• Spark plug: BR8ES, electrode gap 0.4–0.6 mm
• Brake fluid: DOT 4 (replacement recommended every 2 years)

CPI SM 50 Tuning – Our Range

In our online shop, you will find everything to keep your 50cc motorbike in top shape. Whether for regular service or a performance upgrade: we offer a large selection of supermoto exhausts, SM cylinders, and original carburetors, as well as specific spare parts for two-stroke engines such as pistons, reed valves, and radiators.