I've been struggling with problems with my 12.5 b&s vertical shaft motor. It ran low on oil a while back, it never siezed... but it did stop from the friction. I simply took the head off & lubed the cylinder wall with oil & worked the piston by hand via the flywheel. I put the head back on & then it started right up &I finished my lawn.

The next time I stated the mower,the connecting rod broke. After re-assembly & start up, the motor would not run right, so I took it apart again & changed the rings. Then after re-assembly the connecting link broke. After replacing th connecting link, I started it up & the (new) link imediately broke again !!

Has anyone had these issues? Or...know what I might be doing wrong??
I am at a loss with this motor.

I have had it apart 3 times & am about ready to junk it!!
Hope someone can give me some pointers... Thanks!!

Rob

thebriggsdude

No problem.....

As for the engine, you may end up swapping the wiring too!!, so don't go cutting it up...
And measure the pulley on the new (well used) engine and the old one...., make sure they match up, close enough will do though.

liltony8482

your crankshaft bearing is spun pull it out of your motor and check to see if you have lines or groves in your crank if you do there is no fixingit just that you will need a new crank