With the plugs showing white & your heat range correct & timing good yes I'd go richer on the rods and or the jets and a i.e. .003" jet change is far more than a .003" rod change as enlarging a doughnut gives you more area than reducing the center hole so to speak & you may very likely need a larger carb but I'd experiment w it first jetting/larger needle & seats/float level/secondaries before the dual line and dial in your timing before the carb. I'm thinking this carb should be pretty rich as is tho modern no lead gas does not show the color of yesteryear. A person really needs a LM-1 or 2 A/F meter & I'm in the same position just guessing w my eddy 600 1406. There are some very good in depth plug charts avail, check the archives and or google it