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How do you know it is not getting gas? Have you tested for fuel pressure? Does it have spark at the spark plugs? Have you checked for power to the fuel pump? Given that the engine has been replace make sure all the ground wires are attached and tight. I strongly suspect you have a loose ground wire somewhere.
It sounds like the pair valve hoses have come loose or un attached to where they are supposed to go.You have constant velocity carbs on that bike and those hoses need to be correct in order to gain top speed.They attach to the line that goes to the velocity diaphragms for the carbs.
If it dies try removing the gas cap. If the gas cap vent is plugged it will do what you described. The other area to check is the coil or what Briggs sometimes calls an armature. You can buy a cheap spark tester at an auto parts store. When it dies put the spark tester on and if there is no spark then that is probably from the coil failing when it gets hot.
You need to change the spark plug here say if it is a BR 8ES (NGK) then move on to BR 6ES and if that fail then move to BR 10ES..I use to do racing and its to do with playing with that until it is sorted..Now you may also have a faulty coil, faulty spark plug cap or something else here.It may not necessarily mean it is the spark plug.
Replace the spark-plug, check the quality of the fuel(gas that is mixed or was stored more then three months is stale and wont fire correctly) make sure the fuel and air filter not clogged. If there is no change then your problem may be more technical, a nest may be restricting the govenor or you missed something with the carb and there still is debre causing it to stall.
Couple things- 1. If the plug was dirty after 1/2 hour you have either the wrong heat range plug(too cold) or 2. a fuel/carb issue. Buy a hotter NGK plug, ask for help the numbers don't always make sense. Use only full synthetic 2 stroke (I always liked bel-ray) and fresh 93 octane fuel. When you find a plug that works good buy a case of them, 2 stokes will foul plugs period. And some advice with your solution, never head into the woods without a spare plug, they will foul at the absolute worst time.
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