I called Bruce today and asked this question, but made the mistake of not writing it down and forgot. Seems like he said 1 3/4", but I wanna be sure before I go cut that size hole in my new air cleaners.

Also, will regular 1/4" fuel line fit the fuel bowl vent outlet nipples on top of the bowls?

Thanks!

Edited July 17, 200916 yr by g9m3c

They are actually 46mm, but 1 3/4" is really close.

Thanks for clarifying that! 46mm converts to 1.811 inches, ao I'll probably cut them to 1 13/16" just to be safe.

Any idea on the float bowl vent outlet size?