measuring a carb

A friend and I were looking at several carbs the other day and started measuring them. The book list a M carb as 1 1/4" updraft but nothing measures so. Where are they getting this measurement from????
Thanks,
Charles
 
It's kind of a "nominal" size, like pipe sizes are, meaning that it's the area of a 1 1/4 bore with the consideration of the area with the inserted throttle shaft's area subtracted...so the measured diameter is greater to allow for that. Naturally the minimum size in the venturi is somewhat less, couldn't be a venturi if it wasn't.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top