I had to replace the oil slinger/governor in this engine. Did so. Made sure the timing was lined up when I put everything back together. New gasket. Put a brand new carburetor on. Adjusted the valves to specs and in turning everything seems to be moving correctly, rods were functioning etc not bent or anything. Did spark plug test and it is getting a spark. When I try to start this (I do have the air filter off so I can get to everything) the starter turns everything over but it never fires. I've put starter in and one time I got a pop but most of the time nothing. This mower did sit (in a garage) for 4 years and the solenoid was frozen but I went ahead and replaced the whole carburetor which came with one. Any ideas on something I am missing here? I appreciate any help someone might have. Thanks.