Scag Freedom Z engine won't start after regulator replacement

F

Farmer10021

Forum Newbie
Hi
I have a Scag Freedom Z mower, (It has a KT725 engine) it had battery charging issues which turned out to be the regulator.

I also had to clean and lubricate the starter cause it had locked up.
However after the engine was assembled and running with the new regulator the engine didn't have much power and would bog down to the point of stalling when mowing.
Eventually the engine backfired and cut out, and I haven't been able to get it to start since. I have tried adjusting the gap on the ignition coils incase that was wrong, replacing the fuel pump, and replacing the carburetor, but it still won't start, and will sometimes backfire loudly when I crank it.

It has spark, it gets fuel, and there's plenty of compression.

Any advice would be appreciated!
 
If you have a good spark, and the combustion chamber is getting fuel and you have compression.. to ME that leaves one thing.. Spark at the correct time...i would look at the flywheel key.
have you removed the flywheel recently?
 
Scrubcadet10 said:
If you have a good spark, and the combustion chamber is getting fuel and you have compression.. to ME that leaves one thing.. Spark at the correct time...i would look at the flywheel key.
have you removed the flywheel recently?
Click to expand...
Flywheel had to be taken off to replace the regulator, so yes.
 
Did you torque the flywheel back to specification?
if not the flywheel can shift on the tapered shaft and shear the key.
 
You are not alone.
BAd news is now there will be a little damage to the edge of the key slots on both the flywheel & the crankshaft that will need a little attention.
The tinest of burrs will prevent the tapers locking and you will be shearing keys from here to eternity
 
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