2012 Briggs and Stratton model 33187 2371 G5, Craftsman yt3000 bought new in 2012. About a year ago had the common issue with the compression release so have been removing the air filter and covering to get it to spin and start. Last week it would not start so after some research I found that the flywheel had not only sheared the pin but had cracked. Bingo so a couple hundred bucks and now can only get it to backfire through carb but not start. Got fire, cleaned carbs and adjusted valves, thinking something with timing but what else is there after replacing flywheel and key. Something damaged internal. thanks in advance