Features： * You will get a brand new and high quality 27mm carburetor kit! * Made of high quality materials, high quality manufacturing process, strong and durable, excellent life * Gasoline carburetor with 27mm throttle body diameter and 12V anti-retroduction solenoid for 340-420ccm engines. *During shutdown (ignition off, but engine still turning), the anti-retro valve is dised from the 12V power supply via the ignition lock. This causes the needle to be pushed upward by a spring, which closes the needle valve and the main jet. Now, no further fuel enters the cylinder when the engine is running at reduced speed. This prevents unburned mixture in the hot exhaust from igniting. *Applicable to various GX340/GX390/GX420 engines. *Number: CMI C-G 3500 / 123-11 Details： Material: High quality material Color: As shown in the picture Size： Throttle body (outlet): 27mm diameter Choke valve (inlet): 30.5 mm diameter Total length (flange to flange): 61 mm Stand bolt hole distance: 53 mm Mounting hole bracket bolt: 7mm diameter Throttle actuation: by linkage mechanism Choke valve operation: by linkage mechanism Idle throttle adjustment screw: Yes Idle air injector adjustment: Yes Fuel fitting: Ø5(6)mm For hose diameter: Ø5mm Float chamber removable: yes (washable) Float chamber drain plug: Yes Anti-return valve: Yes, for 12V DC (direct current) Total height: approx. 160 mm Width: approx. 80 mm Package Contents： 1 x carburetor + 2 x gaskets Note： 1. Please check the size carefully before purchase. 2. Due to the difference of computer monitor, the color may be slightly different from the picture above. Thank you for your understanding. 3. Manual measurement, please allow 2-4mm error 4. If you have any questions, please feel to , we will reply and help you solve it as soon as possible.