Polini 165cc Big Bore Cylinder Kit for 150cc Genuine Stella Vespa PX (LML) ScootersTake your Stella 4T Manual to the next level by strapping on this 165cc big bore kit. This kit will make the bike go significantly faster and have extensive more power through the middle gears. It’s a must have for any 4T that is pulling a sidecar or riding hillly terrain. You will need to replace your stock air box upgrade your carburetor. We recommend the Polini 22mm Carburetor as well.The Polini Exhaust also goes well well with this kit. *NOTE* This cylinder kit will not work on 2-stroke and Automatic Stellas.**