Pinasco Flytech 25356850 ignition for Vespa PX 125 T5, with 20 mm cone, 1,6 kg flywheel, black fan and 12 V 90 W system.

The ignition Pinasco Flytech 25356850 is the 1,6 kg flywheel configuration dedicated to the Vespa PX 125 T5 engine. It uses the 20 mm cone, powers the 12 V system with a declared power of 90 W and combines variable advance with a flywheel mass suitable for a more regular power delivery than the 0,9 kg versions. The black fan and the 25356850 manufacturer part number distinguish this kit from the 1,4 kg T5 variant and from the Flytech kits intended for conventional PXs.

Identity and content

The supply includes the ignition system designed for the T5 version, with stator, coil/control unit and fan according to the kit configuration. The weight indicated refers to the flywheel of the 25356850 variant. It should not be confused with the code 25356851, which identifies a different flywheel mass, nor with components for PX 125-150 engines with traditional cylinder: the T5 engine has its own characteristics and requires specifically dedicated spare parts.

Compatibility verified

The application is for Vespa PX 125 T5 and T5 Classic with compatible T5 engines. Before ordering, check that your vehicle retains the shaft, stator, and wiring from the T5 configuration, as replaced engines or previous conversions may modify the cone, connectors, and electrical services. Automatic compatibility with non-T5 PX 125, 150, or 200 models is not declared.

Assembly and adjustment

Check the shaft taper, key, and thread, clean the mating surfaces, and install the stator without pinching the cables. Set the ignition advance based on the actual engine and check it with a dial gauge and strobe light. The graduated reference facilitates adjustment but is not a substitute for dynamic measurement. Tighten the flywheel to the specified torque and check that the fan and flywheel cover remain free throughout their rotation.

Installation and warnings

Follow the pattern Pinasco for regulator, ground, ignition, and utilities. Bulbs or accessories not suitable for 12 V must be replaced; improvised connections can cause overvoltage or failure. The 1,6 kg flywheel retains greater inertia, useful for touring, but carburetion, ignition timing, and cooling must still be checked after any engine modification. After the first heat cycles, recheck the flywheel nut, wiring, light voltage, and operating temperature.