Derbi Piston Port Metra Kit 38mm "50cc" Cylinder Kit bp6es You can likely use this

You can likely use this on other AM6 powered bikes but it is designed to fit and clear the RS1 frame

These are commonly found in PHBG and SHA series

This engine must have very few miles on it

Replacement 45mm piston kit for multiple kits

The plastic is in pretty good shape with no cracks or chips besides a small piece on the rear under the rack

Derbi Piston Port Metra Kit 38mm "50cc" Cylinder Kit bp6es You can likely use thisNew old stock, 38mm "50cc" Metra Kit for Derbi mopeds with the Piston Port engine. Cast iron design with 2 ring piston makes for a reliable cylinder. Comes with cylinder, piston, rings, pin clips, and gasket kit. These are vintage inventory. They may not have that brand new shine like one made today.