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the engine in this oc3 was overhauled with new pistons, rods, and bearings, new carb, magneto, plugs and wires. the engine starts and runs like new for about 30 mins. under load. it then loses power goes pap pap(not a backfire)and dies. it will not restart for a period 15 to 20 mins. even with a 12 volt battery spinning the engine. after cooling,  the engine will again start and run like new for another 20 or 30 mins. then again dies. i am using 92 oct. fuel, with no ethenol. the new carb. has been replaced with an orginal rebuilt from zimmerman. the condition remains the same. timing of the engine is exact and the spark is strong during the no start period. Plugs appear to burn on the black side. fuel feed is by gravity through a relatively staight tube. vent on fuel tank is open. over choking causes overflow from carb. exhaust is relatively clean even if over choked under load. our local mechanics prefer to talk about other things. the little piece of junk is otherwise in mint condition but is pushing for an early burial unless maybe you could help.  is a vaporlock possible within the carb? i could use any help you may have.  thank you'       r.walters     e-mail   mailto:roberly@toast.net">roberly@toast.net