If you are wanting to get the most from your Zongshen GB620 you'll need to upgrade to a VM or PWK style carburetor with a larger bore than stock. This manifold has a 42mm external diameter designed to adapt from 36mm to 42mm VM or PWK style carburetors to the Zongshen GB620 or GB675 engine.
Our intake manifolds are machined from a billet of 6061 aluminum on our CNC mill right here in house for a perfect fit, high durability, and don't require a gasket because they all use an o-ring so that you can install and remove them as needed.
