Plenty of glows here, 2 and 4 cycles. I run them juicy, more compression, cooler running and they seem to last longer. Haven't had to change a glow plug in years. I use S&W 15% in both with outstanding results. I also add a few ounces of Beanol Racing Castor to each gallon. Running them on the rich side yields a thin smoke trail and a cooler run. Any tips how to get a better "smoke trail" without using a dedicated smoke system. I used S&W Fuels glow fuel, standard 2 cycle 15%. Stan in Easton, Pa. produces an excellent fuel at an excellent price. Check him out, you'll like the fuel. Bill