Removing 12.5 briggs&stratton engine,central bolt WON'T come out!

Torque setting briggs stratton model 13A8693F190

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7 days ago - Need head bolt torque for Brigges Stratton 18 Hp ... 210 to 230 inch pounds. Torque in a crisscross pattern upper left lower right upper right or left or right.

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How do I Find my engine specifications?

Briggs & Stratton https://www.briggsandstratton.com > faqs > browse > e...
To find basic small engine specs like torque, fuel & oil type, filter or cylinder info, check out specific product pages for your snow blower, lawn mower ...

and also

https://www.google.com/search?q=briggs+%26+stratton+13a8693f190+service+manual

..

Try website for Briggs & Stratton. Or use Google Search for Briggs & Stratton 12 HP IC Quiet Engine Manual.

Unscrew the central bolt (9/16") - remove blade and any washers etc. It's a conventional right hand thread (anti-clockwise to remove), but may well be extremely tight. If necessary, grind the head of the bolt off and replace it.

The blade boss slides off the shaft - in theory. In practice, you will probably have to use a puller bearing on the blade bolt to pull it off. Remove the drive belt first!

if there is thread locking compound on bolt or threads it must be removed, use a tap to clean the threads and a wire brush to clean the bolts. Use a thread locking compound (blue) when reassembling, torque the bolts to 30 ft. lbs. alternating bolt to bolt in 7-10 lb. increments. Recheck the torque after the engine has been ran up to op temp.

turn the crank see if it rises back up you may have droped one of the guides that ride the cam because youll have to tear her back down

crank cover gasket is bad replace

Misfiring could be caused by simple things like fouled or worn out sparkplugs or an ignition system that is slightly faulty or Fuel problems such as dirty or stale fuel or clogged filter causing a leam mixture. Some B & S motors have an switch that cuts the Ignition if the oil pressure or oil level is low.
Another cause could be the Valve clearances are out of adjustment.
Armed with your Engine Number, visit the B & S Website for comprehensive information and specifications as well as a good FAQ listing.

aramature must be removed to get to the mounting plate it will slide out off case loosen long bolt in center of armature hold armature and hit bolt briskley will pop off be careful putting arm back may be 2 brushes inside have a helper hold brushes back

Ring problems will do this

One thing I read is that on some the arm from the govenor shaft can slip on the shaft so the arm is rotated on the shaft to a point the govenor isn't even in contact with the internals driving the shaft. On those units a clamp bolt becomes loose causing the problem.

I suspect if there IS an internal problem it is severe and one would have to disassemble the engine before operating it lest damage occur from loose parts.