Re: have REAL power loss now!
You might be lucky and just need to have a helicoil insert put into the head. You might be even luckier and get away with just rescrewing the plug in.
I had a humber throw number 1 plug once - you should have heard the racket. its an alloy head engine and it just screwed back in no problem.
Its more likely that you'll have problems if you had the throttle wide open because the more power the more pressure.
Hope your engine is ok... if not you will probably be looking at a new head, assuming the plug itself hasnt broken inside the engine.. which could make for more expensive problems.
"....Look, no pedals... *thud*..." The mating call of the motorized-biker.
"RetroEagle" - 32cc Two-Stroke, Piped. 35mph on #13 gear. Reversed stem with springer fork.