The 4-speed gearbox was specially designed as a replacement gearbox for the linkage-operated engines of the V1-V15 series (built 1948-50) from Benelli.
The complete solution completely replaces the weakly dimensioned two-piece drive shaft and, with its large-toothed modules, ensures improved running smoothness and reliability.
The gear set contains:
Graduation
The gradation of the gear wheels(13/56, 13/40, 17/37, 20/34), together with the original primary wheel (67) and the original clutch pinion, allows comfortable gear changes and well-graded gear connections.
Gearshift lever
The original 3-speed gearshift lever can no longer be used. The conversion to a 4-speed gearshift lever for the GS150 is feasible with manageable effort and is absolutely justified for the increase in comfort gained.
BENELLI
Transmission parts from Stefano Benelli justifiably enjoy a very good reputation in the Vespa scene. If you are looking for reliable racing technology for your gearbox, you will find it here. Hardened to an average of 60 HRC, Benelli parts offer exactly the perfect balance of sufficient hardness and the necessary elasticity to withstand the enormous loads in a racing engine.
Stefano now also offers his enormous expertise in the form of a complete gearbox for the Wideframe models. This includes the four gears, the auxiliary shaft, the auxiliary shaft axle and a gearshift cross with shift pin bush.
CONCLUSION: Modern replacement gearbox for more riding comfort.