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Gear Cog 50 teeth, 3rd gear,
"4-gear PK" for Vespa 50 S 3°
/Special V5B3T 3°/V5B4T 2°
/SR (D)/100 2°/125 PV 2°/ET3
Ø 104,5 mm, h 10 mm, mid
section: 4,2mm, "standard 3rd
The arrangement of gear cogs on the output shaft combined with the smaller cogs of the primary drive assembly form together the final drive ratio of your motors gearbox setup. If this is not, quite literally, geared to the needs of the other components included in the motor, even the strongest cylinder will not help. You can either be constantly revving the life out of your motor or not have enough momentum available to change up to the gears. A cleverly chosen final drive ratio, often achieved by the replacement of just one gear cog, can work wonders to your acceleration and gear changing process.
Gear cogs, as with any other mechanical component, are exposed to wear and tear. Motors with higher mileage or performance show obvious signs of mechanical erosion, especially in the grooves where the gear selector cruciform sits during use. If they are rounded of or otherwise damaged they will need replacement.
SIP-TIP: Do not forget to replace the relevant spacers, safety washers, oil seal, cruciform and shaft bearing.
DRT are now also producing a set of their high-end gear cogs in the original factory gear ratios. These quality components are CNC machined from a special steel alloy and then tempered, making them suitable for extreme loads while simultaneously increasing their effective working life. To reduce their overall weight and mass they have metal removed and are very precisely produced. They are first choice parts for both complete engine overhauls and also tuning projects.
OEM Numbers (for the purpose of comparison)
ICs 3^z50 722/stand.(ric.4m) (DRT)
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