RE: another darn ryobi post (ryobi performance modification, analysis and comparison)
I have some zama and walbro that are larger than what you have talked about.
Inlet 8.25 mm,Outlet 13.92mm . This is a zama.
In 8 mm, out 14.25 mm -Walbro WT57 10/86
Some others smaller and larger,too.These all came from weedeaters.
I need to say that I have not run any of the motors.I have only blueprinting these to understand what I have and to pass the info on.I have built a test stand today to start helping in the running info that some of you have been helping with.