Original Vespa Spacer Ring - 12 x 18 x 3.5mm - LX / Sprint / Primavera - 842166

This ring fits between the camshaft sprocket and the camshaft bearing of the listed models (under the tab at the bottom of the page).

Don't mess around—use this original shim ring. It has exactly the right dimensions and is made of the correct material. Just one parameter needs to be different, and you could eventually damage the engine.