Malossi 185cc Big Bore Cylinder Kit w/CDI for Yamaha S-Max 155 SPECIFICATIONS: Bore 63 mm Stroke 58.7 mm Displacement 183 Compression ratio: 10.6:1 Material: primary aluminium alloy with a high content of hardened and tempered silicon, cylinder liner with silicon carbide coating in a galvanic nickel die and crossed smoothing with two diamond passages with very limited tolerances Machining: on machine tools with high precision numerical control Cylinder-piston connection with an allowance of 0.05 mm Recalculated and upgraded heat exchange surfaces CDI FORCE MASTER 2 SPECIFICATIONS: Carburation adjusting ?? 20% at min/medium/max RPM limiter: + 1000 RPM 4 different maps already built in: COMPATIBILITY: S-Max 155 Xenter 150i Force Master is the innovative CDI which allows to change the injection in order to fit perfectly the Malossi 4-stroke cylinder kit. This CDI has been scheduled with different maps so as to be coupled perfectly with your vehicle whatever its setting is! **