Malossi 14/39 Primary Gear Kit for Aprilia SR50R (Carb)

$125.00

Malossi Gear kits (both primary and secondary) change the gearing ratio of the diff gear in the rear of the motor thus either gearing the scooter towards a greater top speed or toward more acceleration at lower speeds.

 

In Stock at Euro Warehouse (Ships in 8-12 days)

Description

Gear kits are typically used when trying to gain more top speed. As gearing ratio’s are usually well set from the factory, in almost all cases the installation of a gear ‘up’ kit (lowering the ratio for more top speed) should not be used in an otherwise standard scooter. The beneficial use of gearing up a scooter is on a motor which has been modified to produce more power (performance exhaust, cylinder, carb, ect). In almost all cases, a lower gearing ratio is what a scooter tuner would aim for, to achieve more top speed and give the motor more gearing to appropriately match the higher power output.

Within a scooter diff gear there are 2 sets of gears, the primary and secondary drives. Both are made up of 2 gears each. The Primary drive is made up of the Primary Drive Shaft (shaft that the clutch and rear torque pulley sit on inside the CVT transmission) and the outer gear of the idle gear. The secondary drive is made up of the pressed shaft gear inside the outer gear of the idle gear and the final drive gear which is pressed onto the drive shaft (which the rear wheel bolts to).

Working out the amount of difference is done by calculating how many rotations of the primary drive shaft (CVT side of the diff) equate to one rotation of the drive shaft (and therefore the rear wheel). An average 50cc scooter will have somewhere between 11 – 13 rotations of the primary shaft to the drive shaft as a very generalised rule.

for instance, as an example if the standard gears are:

Primary – 13 / 46                 Secondary 15 / 48

To work out the gearing ratio: Primary large gear ÷ small gear, secondary large gear ÷ small gear. Then multiply both results for the overall ratio of number of Primary shaft rotations to every single wheel rotation. In this instance with the gear ratios listed above the result is 11.2/1. When working out the difference with the installation of a gear up kit, simply substitute the gearing ratio of the gear kit to plan to install (whether primary or secondary) and see what the difference is compared to the standard.

It is important to note that not all Malossi gear kits will lower the gearing ratio! Please use the information above to make an informed decision.

This particular Primary gear kit used on its own will LOWER the gearing ratio significantly, and effectively cause the scooter to gain top speed, with the sacrifice of acceleration. This kit can be used with either the standard secondary gears, or the Malossi secondary gears.

Fitment List

Make

Model

APRILIA APRILIA SR (carb.) 50 2T LC 2004-> (PIAGGIO)
APRILIA APRILIA SR R FACTORY 50 2T LC (PIAGGIO C361M)
APRILIA APRILIA SR DITECH GP1 50 2T LC (PIAGGIO C361M)
APRILIA APRILIA SR R (carb.) 50 2T LC (PIAGGIO)
APRILIA APRILIA SR Street 50 2T LC euro 2
DERBI DERBI ATLANTIS – BULLET 50 2T 2003->
DERBI DERBI GP1 50 2T LC
DERBI DERBI GP1 OPEN 50 2T LC
for vehicles WITH PRESSED fitting PRIMARY gear
DERBI DERBI GP1 REVOLUTION 50 2T LC
GILERA GILERA ICE 50 2T
GILERA GILERA RUNNER PureJet 50 2T LC <-2005
GILERA GILERA RUNNER PureJet 50 2T LC 2006->
GILERA GILERA RUNNER SP 50 2T LC <-2005
for vehicles WITH PRESSED fitting PRIMARY gear
GILERA GILERA RUNNER SP 50 2T LC 2006-> (C451M)
for vehicles WITH PRESSED fitting PRIMARY gear
GILERA GILERA RUNNER 50 2T LC
for vehicles WITH PRESSED fitting PRIMARY gear
GILERA GILERA STALKER 50 2T
for vehicles WITH PRESSED fitting PRIMARY gear
GILERA GILERA TYPHOON X 50 2T
ITALJET ITALJET JET SET 50 2T
MALOSSI MALOSSI C-ONE 5715844 50 2T LC (Piaggio-ruota 12/13)
for vehicles WITH PRESSED fitting PRIMARY gear
PIAGGIO PIAGGIO DIESIS 50 2T
PIAGGIO PIAGGIO NRG EXTREME 50 2T
PIAGGIO PIAGGIO NRG EXTREME 50 2T LC
PIAGGIO PIAGGIO FLY 50 2T
PIAGGIO PIAGGIO NRG MC2 50 2T LC 1998->
PIAGGIO PIAGGIO NRG MC3 Purejet 50 2T LC
PIAGGIO PIAGGIO NRG MC3 DT 50 2T
PIAGGIO PIAGGIO NRG MC3 DD 50 2T LC
PIAGGIO PIAGGIO NRG Power DD 50 2T LC
PIAGGIO PIAGGIO NRG Power DT 50 2T (C453M)
PIAGGIO PIAGGIO NRG Power Purejet 50 2T LC
PIAGGIO PIAGGIO TYPHOON 50 2T 2007->2010
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