Publisher: YAMAKATO. A huayi carburetor kit compatible with Honda and Clones GX390 389cc 420cc engine. Compatible part# 16100-ZF6-V01 16100-ZH9-W21 16100-ZE2-W71. The 27mm carb is fuel tap built in w/ 30.5mm air intake and w/ 52mm center to center mounting holes.