Originally Posted by
Stu @ M Developments
Whatever variations your have seen certainly weren't caused by the temperature of the brass or the air I assure you.
Well, from my experience I certainly disagree !
I have removed several brass type bleed valves to fit an amal type valve in place with simple on/off control and the stability issues dissapeared.
I thought all quality tuners hated them or removed them on sight given the chance
