Trying to figure out my troubles and one of the things on my list is replacing the spring on the vacuum pod of my 750 Speed Demon with a lighter or the lightest available spring. Currently running the "silver" spring and the Demon manual shows the secondaries not fully open until over 7000 rpm (!) with that spring on a 402 CID motor. Thinking of the "yellow short" spring. What do you guys think???? Also, what's with the "white" spring? Manual doesn't show any RPM for this one...does it just keep the secondaries closed?
