Originally Posted by Beemerboff
For fine tuning I use a colourtune plug , and I balance with a Synchrometer flow gauge, but that is just personal preference.
wow .. it's been a long time since I used a syncrometer. still got a colortune in my toolbox. a nifty tool to have around if one doesn't have a gas analyzer. when the flame goes blue, shows optimal mixture, yellow is still bit rich. a bit like tuning a natural gas stove burner by color. unless one has a bacharach fyrite gas analyzer.
if one has not seen a colortune, there's a clear quartz window that allows viewing during combustion.