How to adjust b pipe screw?

Can someone explain to me the way to close and open screws on my b pipe... I want to close them cuz my pipe is running to cold . So who can tell me... I close or open, clock wise or counter? Help! Thanks!!
 

fulltilt429

Delta Dog
Location
Pleasanton, CA
I believe they recommend at least one screw a 1/4 turn. I have gotten best results (peak RPM, and easiest to adjust) by closing all screws but leave the top 1/4-1/2 open.
 
Top Bottom