What brand do you guys use? Do you use different brands in your 4 strokes than your 2 strokes? Do you use different plugs for different makes of engines? (Ex. B&S, Kaw, Honda etc.) I personally run NGK in just about everything I own. No particular reason why, other than they are relatively cheap, have never failed me, and local part stores have them in stock. The one brand I'm not fond of is Champion. I personally have had horrible luck with them. I lost a cylinder in a motor because one exploded and numerous other instances of them just going bad too often and too soon for no reason. Maybe some people have had good luck with them, unfortunatley thats not my case at all.