Have a starter for a briggs. Won't start engine but spins great off mower. Any suggestions

What model do you have and what size briggs.
Could be nedds valves cleanance adjusted,this will cause a engine to turn hard. Pull the spark
Plug(s) and see how fast it turns.

what model do you have and what size briggs.
could be nedds valves cleanance adjusted,this will cause a engine to turn hard. pull the spark
plug(s) and see how fast it turns.

I removed the spark plug and it still barely turns the engine over. Im at work and I don't have model number with me.

Hi,
Starter may be partially shorted or the contacts in the solenoid may be damaged. Either or both would do what you describe.
Peace,
Clarke