what is most likely my problem

[wheelie]

Older Briggs and Stratton I/C Deluxe 12.5 HP .. I can .. with or with out the spark plug in place, hand turn the motor a bit and it turns freely but it then comes up against a hard stop with a clunk.. what is most likely causes.. Thanks..

Model.... 289707
Type ..... 0114 01
Code ... 9301284D

 

[Scrubcadet10]

with the spark plug removed, stick a pencil or other object in the plug hole, as you rotate the engine, see if the piston is moving.

 

[Luffydog]

Piston arm sounds like it broken and is time for new engine or new mower

 

[AtRo Racing]

Your pistons connecting rod is broken from lack of oil or the engine over reved.

 

[Joe Kuhn]

Sounds like it's time to take it apart. What will you find? I like this part of the process. Post pics.