Tohatsu 9.8 carb question

[raczekp1]

Maybe someone can help me. I nned to know one thing. Just over chocke plate inside the carb is a venturi hole. what the noumbers are stamped inside? or can any one measure venturi diameter taken ftom chocke plate side?

 

[pvanv]

There are only 2 different carbs on the MFS9.8A3. The difference is the choke operation; the electric choke model turns the opposite of the manual choke version. The M9.8B (2-stroke) is completely different. What is your actual model, and what is it you want to know?

 

[raczekp1]

well i have carb taken from internet auction. i know its from tohatsu but not sure if its from 8 hp 4stroke or 9.8 4 stroke.
i need to identify this carb becouse i.m gong to fit it to yamaha 9.9 4stroke.
in venturi troath is stamped " 12"
so its from 9.8 or 8 hp ?

 

[Sea Rider]

8/9.8 HP-OB's have less CC than a 9.9 OB, whether being 2 or 4 strokes OB's. Get a 4 strokes 9.9 Yam carb.

Happy Boating

 

[pvanv]

Tohatsu carbs are identified not by venturi but by casting number. The 9.8 manual choke version is part number 3V2031003M, while the electric choke version is 3V2031333M. The 8 hp version has a MUCH smaller throat. The 8 hp manual choke version is part number 3V1031003M, while the electric choke version is 3V1031333M. You can call Tohatsu America at 469-771-3740 to check the casting number.