The mounting screw for the choke/air cut valve is a mechanical fastening and sealing component used on the carburetors of GY6 125cc to 150cc engines, such as those fitted to the Honda Ruckus GY6. It is designed to securely lock the choke mechanism (choke or air cut valve) to the carburetor body, while ensuring an effective seal.
Depending on the carburetor design (PE26, PE28, PE30, or equivalent), a specific threaded area is provided for attaching:
the choke/enrichment flap (electric or manual choke),
or the air cut valve (a small flap that cuts off the air to enrich the mixture in cold weather).
The screw must be sized to:
hold the component securely in place
maintain a proper seal against air leaks
resist vibration, thermal cycling, and internal pressure
allow for clean assembly/disassembly for adjustment or maintenance.
