Bustin Caps son.
I went to ace hardware and the guy that worked there had a pile of screw caps tha come on specialzed bolts they sell I got some of the grey ones I believe 1/2" or so they fit right over the carb tight and the exaust was the same only larger I will check. The ace hardware man gave me enough for three engines and pipes and they were FREE (Ace hardware guy Rocks) take your engine in and tell them your looking for screw protectors off some bolts. Darrin