i'm getting ready to fire up my new 347, what plugs do u guys suggest, just for start up, with canfield heads, i will be running colder plugs with nitrous but just looking for a good plug to start with thanks
I run NGK's in all my rides, but I would check with the head mfg to see what they recommend. Try this link to cross to a colder plug. http://www.sparkplugs.com/default.asp
I'd say chances are they either had the wrong plug gap, had the wrong temp plugs, a faulty ignition system or a combination of and of the three. There are plenty of guys on turbomustangs running NGK plugs with great success.