The engine is on a 2000 model yard machine 42" cut riding mower and was given to me. I was told that it probably just needed the valves adjusted as had been done before and it ran fine. Well, I adjusted the valves; intake - .005", exhaust - .007", with the piston at
1/4" top dead center. The engine still doesn't run and is very slow to turn over. It will turn over a very little bit and then stop and if I keep trying to start it will repeat the same process; turn a little bit and then stop. The starter squeals a bit while trying to start the engine. Any help. Thanks.

Valves may be off again.