Honda 16620 Z8D 842 Thermo Assembly 16620 Z8D 305 Review

Honda did themselves a disservice with this throttle body design. If anyone has a quick and easy way to remove an old thermal wax assembly I'd love to hear from you!

Easy installation. Still disappointed that the original failed and had to manually release the throttle on restart for two years.

The lawnmower started and after the engine warmed up it either shut off or started to "scrub". Even though I had bad gas or a dirty carburetor. It turned out to be a part. As the engine warms up, the thermal wax assembly also warms up. When this occurs, thermal expansion forces the needle of the wax assembly to move forward, opening the carburetor's choke. How the auto choke system works. They don't last long, so two or three.