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- Cylinder -QUATTRINI M244, Ø=72mm, stroke=60mm, connecting rod length=126mm, 244 ccm- Vespa Rally200, PX200, Cosa200 - special crankshaft required
The Quattrini crankshaft with 60 mm stroke and 128 mm connecting rod length is essential for this.
In contrast to the M232, the M244 requires the crankshaft housing to be spindled out on the generator side for the long-stroke shaft. Due to the crankpin offset, Max Quattrini has provided the 60 mm crankshaft with a larger overlap, i.e. a larger outer diameter (on the limaside).
It is designed for use with the original carburettor and touring exhaust, yet already achieves over 20 hp and a whopping 24 Nm at the rear wheel. An original PX200 GS with 12PS/9kW registered in the papers rarely achieves more than 10PS and 15NM at the rear wheel. 60 % more torque and 100 % more power, combined with a power delivery that is very suitable for touring, certainly fulfill more than just the dream of every Vespa rider.
The M244 makes use of several technical tricks to achieve this:
Due to the missing base, a significantly larger piston than usual can be used. The extra-long connecting rod makes it possible to position the overflow inlets in the cylinder further upwards than usual. In combination with the special piston, which has heavily chamfered surfaces on the underside of the overcurrent inlets, this enables a very large overcurrent area without having to machine the engine housing. The long connecting rod with an impressive 126 mm connecting rod also improves the connecting rod ratio from lambda 0.26 to lambda 0.22, which is important for the smooth running of an engine.
NOTE: Crankcase must be spindled out for the 60 mm stroke crankshaft!
Conclusion: Traveling or racing is no longer a question here, but an option
