Sinse you suspect valve clearance is the issue, try getting the model, type, and serial number, go to a online parts store with good illustrations, and see if that engine has a compression release in the cam.
If it does, possibly it is broken.
Or... When you adjusted the valves, the compression release was working, and you adjusted the valve way too loose because the release pin was extended and holding the lifter slightly up. Might recheck the clearance, keep turning the engine through with the feeler gauge in, feeling for the loosest point. When properly adjusted, and it DOES have a compression release, you will see the exhaust (I think, one or the other) slightly lift off the seat in mid compression stroke, then close, when hand turning the engine through.
If all that checks out, get a volt meter, start checking for bad connections.
Check the voltage across the battery posts (not the cable ends, go directly to the posts) while cranking. The voltage needs to stay up around 9 1/2-10v.
If the voltage drops, the battery is low or bad. If the voltage stays high, there is a bad connection.
Keep checking voltage, under load, all the way to the starter post. Common problems are bad ground connections, (that includes loose starter mounts, loose engine mounts if the ground cable connects to the chassis), corroded cable ends, sometimes out of sight under the insulation, bad contacts in the solenoid. If anything heats up, that is a clue to high resistance.
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