Home › Forum › Ask A Member › 1957 Scott Atwater 16hp carb settings › Re: 1957 Scott Atwater 16hp carb settings
April 20, 2015 at 9:10 pm
#14378
On most MD Tillotsons, the slow speed needle controls AIR not fuel. Counter-clockwise (opens) lets in more air, making it leaner. Of course there are exceptions. A few had left-hand threads to reverse the effect. A few had long needles that went way in an controlled the fuel.