Blaster Pop-off Keihin triples

[motoman3000]

I tested pop-off on front and rear carbs but how is this done on the middle carb?

The fuel-in port is capped. It looks like there are only return ports.

 

[motoman3000]

Thanks forum. Your non- response made me think harder and showed me the way.
That being said, pop off was 45 across all three. Each hi/low screw was 1.25 and 1 turn out respectively. I have added an ADA head and tau cetis.
Should there be any adjustments made/changed?

 

[fast superjet chase]

With aftermarket more flowing flame arrestors you will have to lower your pop off pressure