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    B&H 21 hp Intek engine is backfiring through the carb & exhaust

    I recently purchased a used Craftsman YS4500 riding mower with a B&H 21 hp single cylinder Intek engine. I purchased the riding mower from a neighbor who indicated that the mower ran fine last year, but when they began using the mower this spring, it emitted a large about a white & blue smoke...
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