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Hello, so from your information i am thinking of three problems that may be the culprit. The first is a spark misfire, remove the spark plugs and check weather one of them is black. If it is try replacing the spark plugs. If the problem persists you would need to check the spark while the misfire is happening using a spark gap tester. If the spark is ok, then i suggest you try removing the fuel line and see if the engine goes out for a few secs before it goes out of fuel. If yes then the problem here is the fuel pump in the engine. This would require to be rebuilt. Finally it could be a bro***** ***** valve problem. To check them you need to remove the air box and see if the carbs are sputtering back fuel out . If yes then one reed may be broken. As for the engine, if the compression is ok it should run ok irrelevant of the noise.