I marked and installed the custom mains, pulled the custom pilot jets, marked them, & reinstalled them.
Well, another interesting discovery; the aftermarket "AB" 152.5 main jets swallowed the #53 reamer (actually a snug fit), so I expect my modded Keihin jets to perform very similarly to the AB's they are replacing.
The weather sucks right now for performance testing (light rain, low pressure, high humidity, getting dark) so I'll need to wait another day.
I believe that the "AB" jets are marketed by RD Precision Engineering/Freeman Automotive group; they are dimensionally longer than similar Keihin main jets, the inlet chamfer is different, the bore diameter is different, and the bore length may also be different.
I'm looking forward to testing the custom mains.
