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just a guess - have you tried a new plug?

A sudden stop of the blades are caused by 1) object obstruction 2) clump of grass wedged blade tip to deck, 3) bearing bind, 4) belt path loose or off, 5) PTO clutch drop out, etc. Since this happens only while mulching, I put my money on 2. Usually when this is building up to a final wedge, a...

see post-389783

see https://www.lawnmowerforum.com/threads/will-an-early-80s-briggs-run-with-50-psi.63452/?utm_source=threadloom&utm_medium=email&utm_campaign=ed1543&utm_content=iss92#post-389783

Points - wrong advise unless the engine is missing on some power strokes. 50 pounds is enough to start and run. Compression varies with speed of rotation. Most small engines have no specs for compression as a basis for such a reading cannot be established. Cleaning the carbon up by taking the...

some models have details on the hood or pedestal as to this procedure, other's are found in the owners manual. IN NUETRAL let pedal up and go thru the speeds up and down. Exercise it a bit with the instructions given and lube applied. If that does not bring it around, you have a failure in need...

This fix is a good fix for most but a caution has been found. Some later units now only use the fuel shut off to kill the engine, in that the spark is not killed when the switch is turned off. These units take a couple seconds to shut off when the key is turned off. If unsure, check for the kill...

If this design has one on each side, I have two cautions. 1) replace both. 2) wheel toe in toe out may be fighting due to front axle mounting slop allowing the axle to tilt for and aft causing toe in toe out to change beyond normal in forward and reverse but in opposite widths of toe in. The...

The point of this question unanswered is the plug may be your cause

If you still feel the resistance with the plug out, and you reused the head gasket and stoned the head/block as you said, this engine has very tight clearances to the head and may be making contact. Loosen all the head bolts and pull slow and feel the head and if problem disappears.

good advise - i duplicated cause I missed this advice.

This advise must be corrected. Without motor specs in front of me, no engine in over 50 years of service should be set at .002 air gap for the ignition coil. Also, the only advantage of cleaning the surfaces is to get an accurate setting of the air gap to.010 - .012. Dirt, debris, rust do not...

You had oil dilution from failed leaky float diluting the oil with gas and if the plug is down hill or near level when over full, eventually the oil level being a bit above the ring level in the engine, it will bypass the rings and add fluid to the cylinder on start up and smoke blue for a...

It sounds like it is the hydro unit with a two bolt cover for the gear pump. That cover if rotated and installed backwords from how it came of, reverses pump flow. Remove it and install 180 degrees from how it is now.

A little known issue with a very popular plug wire - if totally metal shielded plug connector, a internal brittle white insulator can become cracked inside the metal shield when we wiggle the connector to disconnect the plug wire from the plug. In doing so, this brittle insulator cracks. Once...

I have seen similar issues with the fan near the belt path. I have solved a unit by 1) replacing the fan and 2) trimming some off the blades. The theory is that under some fans that push air away from the belt, the blades are also pushed toward the belt as they flex. Some designs push the air...