hi muggles , a lot depends on your tune adjustment of the carb if you changed type of fuel , change to a higher or lower percentage of nitro fuel , air temp changes read your glow plug element, if its light grey your tune is good , all the glow plugs have different heat ranges cold medium , hot you can check out which type you need, also there are some plugs are turbo plugs you have to have turbo head with it , and these are tapered and there are the plain straight threaded plugs too , you can look into O.S. plugs these are very popular # 5 , 6 , or 7 , novarossi plugs and werks plugs ok the numbers is stamped on the
on the flats of the hex of the glow plug ok you get get more info in this forum in nitro and gas engines ok later mugey