Quick question here. If a throttle body is advertised as a 65mm, which part should be 65mm, the butterfly?
I was sold one by a member here and I think I was misled or scammed. The front opening is close to 70mm, but the rear/butterfly is 60mm.

 

Flip the butterfly/flipper open and stick a ruller through the opening. Measure the flapper from one edge to the other. Sorry if you have it less than 65mm.

 

So it is the measurement of the butterfly, not the opening, correct?

 

Correct!