Small Engine Troubleshooting Problems? Ask a Mechanic Now.
You are saying the engine will not turn over fully for start? This is not lower pulley problem, but a compression problem. Also is the battery fully charged, with over 13 volts? Is this the Briggs single cylinder engine?
Can you explain better what is happening? And have you tried to spin engine with spark plug removed?
The pulley has to be keyed to the crankshaft. The key or the pulley may be stripped out and is not turning with the crankshaft. Remove the pulley and see if it has a loose key or a raised area inside the pulley to mate the slot in the crankshaft.
# ***** in the above link?
Did you find the problem?