As a "sanity check" I would now set the timing by using the piston position. I don't care what your timing marks say physics over rule any timing marks. 11/16ths BTDC.
There are simple tools for doing this, cheap.
Set the timing there, That is fully advanced 45 degrees BTDC.
Do that. Start the engine and run it for a minute.
Recheck the timing once again by using position of the piston, not timing marks. Continue to ignore them.
If the timing hasn't changed this time you can ignore the timing issue and start further trouble shooting.
If the timing HAS changed you will now have to look at your valve timing.
If the timing HAS changed you will now have to look at your valve timing.
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