DetailsTaller gears reduce the overall reduction factor of the gearbox. If the engine is powerful enough to pull the taller gears, this modification will also raise top speed. Only use with tuning kits! Original cylinders are normally not powerful enough to pull this sort of gearing. For all Piaggio engines built since '99 with counter bearing in the gear cover.
If you are not sure which gear-up kit you need, we highly recommend this gearing tool!
Transmission ratio: Z=13-40 (3,07)+13.3%, shaft diameter: d=17.7 Watch out!!! In 1996 Piaggio changed their gearboxes. The diameter of the small shaft between primary and secondary gears for pre '96 models was 18.0mm, for post '96 it is 17.7mm. Measure if in doubt!
- Additional Information
Name Polini Primary Transmission 13/40 Piaggio NRG after 1998 Item No. P202.1378 Brand Polini Type Primary Assembly Press-fitting Gear Ratio 13/40 (3,08)
- Fits to (41)
Your product goes with the following manufacturers and their models:
Mojito Custom 50cc (Piaggio engine), SR 50cc Funmaster LC (after 07/2003) - Piaggio engine, SR 50cc LC (after 07/2003) - Piaggio Engine, SR 50cc R Factory i.e. LC (after 2005) - Piaggio Engine, SR 50cc R LC (after 2005) - Piaggio Engine, SR 50cc Racing LC (after 07/2003) - Piaggio Engine, SR 50cc Sport LC (after 07/2003) - Piaggio Engine, SR 50cc Street LC (after 07/2003) - Moteur Piaggio, Sportcity Street 50cc
Atlantis 50cc AC (after 06/2002) - Piaggio, Atlantis 50cc LC (after 06/2002) - Piaggio, Bullet 50cc AC - Piaggio, GP1 Racing / Revolution 50cc LC - Piaggio
Easy Moving 50cc AC, Ice 50cc AC, Runner 50cc LC (1999 - 2000), Runner 50cc LC (after 2004), Runner 50cc LC (before 1999), Runner 50cc LC CAT (after 2001), Runner SP 50cc LC (after 08/2004), Stalker 50cc AC (after 1999), Stalker 50cc AC (before 1999), Stalker Naked 50cc, Typhoon 50cc AC (before 2011), Typhoon X 50cc AC (before 2011)
Jet Set 50cc AC, Torpedo 50cc AC - Piaggio
Fly 50cc AC, Free 50cc AC (after 1999), Liberty 50cc AC, NRG Power DD 50 (after 2005), NRG Power DT 50cc AC (after 2005), NRG mc2 50cc LC (after 1998), NRG mc2 Extreme 50cc AC, NRG mc2 Extreme 50cc LC, NRG mc3 DD 50cc LC CAT, NRG mc3 DT 50cc AC CAT, Typhoon (TPH) 50cc AC (before 2010), Typhoon X (TPH X) 50cc AC (before 2010), Zip 2 50cc AC CAT (after 1999), Zip 2 SP 50cc LC