TUNING CLUTCH & GEAR BOX The combination of the clutch cog and the primary-drive cog provides the primary transmission ratio of this Vespa. It is solidly riveted to the input shaft and is directly connected to the secondary transmission. The more power produced by a motor, the taller the gear ratios should be. This enables the additional performance to be translated into a higher road-speed. This primary-drive cog is compatible with all
Vespa PX clutches and the original clutch can no longer be used. If you wish to include a PX clutch a CNC machined clutch gasket-surface spacer (#17650000) will also be required. The cogs are available with either 64 or 65 cog teeth. The smaller the number of cog teeth (64/65), the taller the transmission ratio will be.
PRIMARY DRIVEN GEAR, INPUT SHAFT, DRT 695
PRIMARY DRIVEN GEAR, INPUT SHAFT, SERIE PRO
for Vespa 125 VM/VN/ACMA/150 VB/VGL1/VL
Do not forget to order the suitable DRT primary-drive repair kit (#16020770).
for Vespa 125 VM/VN/ACMA/150 VB/VGL1/VL
65 teeth for clutch cog 22/23/24 teeth
40436950
€57,98
64 teeth for clutch cog 22/23/24 teeth
40436952
€57,98
67 teeth for clutch cog 20/21/22/23 teeth
40433670
€57,98
65 teeth for clutch cog 22/23/24 teeth
40436951
€57,98
INPUT SHAFT ASSEMBLY 4-GEAR
CLUTCH KIT SIP 'COSA 2'
This set of output shaft gear cogs ‚DRT 807‘ comprises of 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 an improved exploitation of any extra power available and also a higher maximum speed! This conversion requires mechanical knowledge to be properly and safely 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 at our webshop. With 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 centre section machined to fit and the fourth requires narrowing. The suitable DRT gear cogs can be used as well of course. DRT also produce high quality primary drive cogs with 65 or 67 teeth, which have the effect of altering the overall gear ratio. This are fully compatible with otherwise original gearbox set ups.
Now the advantages of a modern 'COSA 2' clutch type can also be enjoyed by the riders of vintage wideframe models. We use the SIP 'COSA 2' clutch as a basis. Due to the higher pressure and the greater friction increased power can be transmitted. The laser-cut precision build of the clutch basket helps prevent sticking, slipping and jerky acceleration while also requiring little pressure for operation. These clutches are also suited for both standard and tuned engines. This SIP clutch kit includes a SIP 'COSA 2 clutch and all necessary mounting extras such as a gasket surface spacer, a pushrod, a pressure plate, etc. They are available with either a 23 or 24 toothed drive cog.
Do not forget to order the gear selector and cruciform from the GS. You can then experiment with possible gear ratios, starting with a primary drive cog that has 65 cog teeth. for Vespa 125 VN/VM/150 VL/VB1 Input shaft assembly DRT 807
0 0 0 0 2 2
40436807 €167,23
Mounting hint: In order to mount the clutch, material must be removed in the area of the third stud and clutch cover. With tuned motors a primary gear cog with 64 or 65 teeth should be used. for Vespa 125 VN1T06001 ->/-> VNA2T 081468 /ACMA/150 VL1-3T/VB1T/VD1-2T/VGL1T 23 teeth
93405400 €234,45
24 teeth
93405410 €251,26
for Vespa 125 VM/VN1T->06000 23 teeth
93404400 €217,65
24 teeth
93404410 €242,86