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backfiring thru carb on Briggs & stratton 10.5 hp motor?

I have a swisher tow behind with 10.5 I/c motor. Motor will not start. Add gas into spark plug hole and it backfires thru carb.

I have replaced carb as old one had an extreme amount of rust.

Any ideas?
terry, June 2013
Check the valves you will find one staying open.

Johnny, March 2014
link Click here to see other fixes for Briggs & Stratton.