Piaggio Aprilia Gilera NRG Purejet Runner SR 50cc Crankshaft Bearings Seals & Gaskets_Gaskets Although the "Vintage" Replica is

Although the "Vintage" Replica is a race exhaust

Alternative in between sizes are 81 or 83 Link for Up Geared / Down Geared Scooters

which in turn means stress

To assure better heat dispersion

PIAGGIO - Free

Piaggio Aprilia Gilera NRG Purejet Runner SR 50cc Crankshaft Bearings Seals & Gaskets_Gaskets Although the "Vintage" Replica isPiaggio Aprilia Gilera NRG Purejet Runner SR 50cc Crankshaft 50cc Models APRILIA SR 50 DI TECH 2003 2004 PIAGGIO MOTOR CRANKSHAFT APRILIA SR 50 R FACTORY DI TECH 2005 ON CRANKSHAFT GILERA RUNNER 50 PURE JET 2006 ON CRANKSHAFT GILERA RUNNER 50 PURE JET UPTO 2006 CRANKSHAFT PIAGGIO NRG MC3 PURE JET