Primary Driven Gear 67 teeth input shaft DRT 367 | Vespa 125 VN/VM/150 VL/VB1

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SKU: 40433670
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Primary Driven Gear 67 teeth input shaft DRT 367 


fits clutch cog 20/​21/​22/​23 teeth

Faro Basso, Fender Light – THE vintage Vespa icons, no doubt! Regrettably, the few remaining classic Vespa Wideframe models tend to be restored to their former glory, conserved, and no longer seen on the road! This is understandable when confronted with a maximum speed of around 65 kph and fragile engine components! It's been fascinating to observe the current technological developments evolving for this scooter type on the German-speaking scooter scene. A reliable motor with adequate torque (10PS) is now possible. DRT has decided to assist in this with the production of suitable gear cogs.

This output shaft gear cogs 'DRT 807' comprises cogs with 13-13-17-21 teeth respectively and is part of a four-speed gearbox upgrade. This kit enables the original three-speed gearbox included with the Vespa 125 VM/VN/150 VL/VB1 to be upgraded to a four-speed type for improved exploitation of any extra power available and a higher maximum speed! This conversion requires mechanical knowledge to be safely and adequately installed. The original output shaft from the VB1M engine can still be used, along with the input shaft. The gear selector and cruciform from the GS 150 should be used to replace the VB1M items.

The corresponding gear cog sizes and their possible combination possibilities are listed below. With the use of the original first gear, the rest of the gear cogs originate from the Vespa PX Lusso models engine. The first and fourth gear cogs will require slight modification, however, with the first gear having its center section machined to fit and the fourth requires narrowing. The suitable DRT gear cogs can be used as well, of course.

DRT also produces high quality primary drive cogs with 65 or 67 teeth, which have the effect of altering the overall gear ratio. This can be achieved without replacing the standard gear cog ratios and is fully compatible with otherwise original gearbox setups.

If you want the option of four gears on your Faro Basso, you will need to invest a lot of time and work!

Do not forget to order the gear selector and cruciform from the GS to complete this project. You can then experiment with possible gear ratios, starting with a primary drive cog that has 65 cog teeth.

The following gear cog combinations are possible, the DRT recommendations for use with a 65 tooth primary drive cog, are marked in red.


Output Shaft

DRT Gear Cog


Article Number


1° Gear

13 th

56 th

original (Ø 114,93mm, 3 Gear VB1m)

modifications necessary

2° Gear

13 th

42 th

PX/PX Lusso



42 th

DRT 801



41 th

DRT 270



40 th

DRT 270/A



3° Gear

17 th

38 th

PX Lusso



38 th

DRT 802



37 th

DRT 281



36 th

DRT 282



4° Gear

21 th

37 th

DRT 290


modifications necessary


36 th

PX Lusso


modifications necessary


36 th

DRT 291


modifications necessary


36 th

DRT 291-O



35 th

PX Lusso


modifications necessary


35 th

DRT 803


modifications necessary


35 th

DRT 803-O



34 th

DRT 292


modifications necessary


33 th

DRT 305


modifications necessary


MOTOVESPA 125 N 125 VT 2T AC 1959  
MOTOVESPA 150 S 150 VTT 2T AC 1962  
MOTOVESPA 150 S 150 V13502C 2T AC 1964  
MOTOVESPA 150 Sprint 150 04C 2T AC 1966 150001->177000
VESPA 125 125 VM1-2T 2T AC '52-'54  
VESPA 125 125 VN1-2T 2T AC '54-'57  
VESPA 150 (T1/150) (D) 150 VL1T 2T AC '55  
VESPA 150 150 VL1-3T 2T AC '54-'57  
VESPA 150 150 VB1T 2T AC '57-'58