Fits all Zenoah 23cc and 26cc engines (Car, airplane, boat, helicopter, etc...) as well as other brands and size engines.
Primer bulb allows for easy starting.
This is the carburetor that comes standard on Zenoah G231PUM and G260PUM water-cooled engines.

Venturi Bore: 12.7mm
Throttle Bore: 15.84mm
Primer Bulb: Yes
Choke: Yes
Mounting hole's distance between centers: 31mm
Accelerator System: No