Product Description
Vespa Clutch Gear Sprocket 22T 22/26 P125/GL/Sprint (B37-17473600)
MEC EUR Italy
The gear cog attached to the clutch assembly drives the primary gear cog
attached to the input shaft in the large frame VESPA motor. Through varying
the size or number of teeth on this cog, you can change the primary gear ratio
of your motor. Changing the clutch cog is the quickest and easiest way to change
the overall gear ratio of your motor. The more teeth the clutch gear cog has, the
higher the gearing.
All clutch gear cogs that fit the VESPA 125 GTR/ TS/ 150 Sprint/ Super/
PX80-150/PE/EFL till '94 with the clutch basket outer diameter of 96mm are interchangeable
without having to change the primary driven gear cog. The 200cc clutches with 20 and 21 teeth
on their respective cogs also fit, but due to the increased diameter of the clutch basket (115mm)
either the clutch cover must be modified, a clutch gasket surface area spacer used or, last but not
least, a 200cc clutch cover being used. If the 200cc clutch with a 23 toothed cog is to be included,
the primary driven gear cog with 65 teeth, also from the 200cc motor, should also be used.
When the 108mm outer diameter clutch is used in a 125-150cc motor the primary driven gear
cogs with 67 and 68 teeth have proved effective in combination with the clutch gear cogs with either
20, 21 or 22 teeth.
The primary driven gear cog in the 200cc motor with 65 teeth can be combined with 21 or 22 toothed
cogs, along with the original item with 23 teeth. The most popular clutch gear conversion cog is the
version with 22 teeth, so enabling an improved acceleration through the gears, without expensive
tuning measures, especially between 3rd and 4th gears.
For VESPA T5 motors equipped with the MALOSSI 172cc cylinder kit, a clutch gear cog with 21 or
22 teeth has proved suitable.
