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8hp B&S issue

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8hp Briggs I/C. I am trouble starting it. It'll fire and do 1-2 revolutions and backfire out the carb. When I do get it to run it has no power and was puffing out the carb. I have replaced the flywheel key, checked the valve clearences which are in with in the specs, cleaned the carb, cleaned the carbon out of the cylinder, and tried a new spark plug. Anybody have any ideas?

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Sounds like the intake valve isn't returning to seat properly. It is fairly common with the smaller varieties. To test it, drop a spoonfull of gas on top of the closed valve and see how quickly it seeps past. It will likely seep a little if it is good, but a lot if it is not seating. Remedy could be as simple as spraying a little pb=blaster down the valve stem and working it a little or tapping it with a hammer handle lightly.

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