Perkinsm, That's pretty much normal for a 4 stroke. The manual for the Saito 82 says to leave the glow ignitor on untill the engine's warmed up. Probably most people don't do that but it will drop a little bit when it's taken off. I usually leave it on for about a minute and then take it off and then advance the throttle just a little and head out to the taxi area and then set it down to a lower idle just before I take off. Works for me. If it starts right up your glow plug should be fine.