Backfire is normal if the fuel mixture is too lean, check the color of the plugs, they should be biscuit brown / tan. If they are grey, it is too lean and can cause valve over heating. Also the timing maybe off
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Backfire is normal if the fuel mixture is too lean, check the color of the plugs, they should be biscuit brown / tan. If they are grey, it is too lean and can cause valve over heating. Also the timing maybe off