Richard-this is exactly what I'm looking for-thanks. My problem is with the 10% ethanol gas we now have. My motor which ran OK before suddenly lost a lot of power.I went up .003" in main jet size, no change, raised the metering rod a bit, no change. Started giving it a bit more ign. advance, that helped. Got it up to where it pulled good thru the whole RPM range but by then it was so far adv. that it was a bit rough at idle & would sometimes kick back against the starter on a hot restart so I backed it off a bit for a happy medium. I'd like to get more mech. adv. & use less initial adv. With these springs & weights I'm sure I can do that. Doug
