It's a Tecumseh 13 HP. I went inside for about 5 min and came back it wouldn't start. It turned over sounded like something was slamming Into something waited 10 min it took awhile to start but did start and ran perfectly fine when I got done turned It off to see If It would start and It did the same thing turn stop turn stop while making metal slamming sound. Waited another 10 min and did same thing but finally cached and started and ran fine. When u try to turn flywheel by hand it turn some then u have to put all u got Into It for It to turn It's like It's on a spring but It finally does turn all the way. And It clicks when u turn It by hand. I adjusted the valves and It's still doing the same thing.
It's about 12 years old runs fine when started but have's trouble starting.