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What does a strong spark look like?

With those numbers on all 4 and 14K on the bike I would go straight to a valve adjustment.
 
Those pressures are so close together that I would be inclined to do a valve timing check first.
 
Good thought, timing off could lower compression on all 4, while keeping them near equal. Still wouldn't explain eng. quit & very hard to re-start when hot. Earlier you mentioned an orange spark, if that's the case, that needs to be fixed, blue or white is OK, orange is not good.
 
Valve clearances were checked in September 2019 and again today; all within spec though intake and exhaust of both 3 and 4 tightened up since September. And yes, a valve clearance does not explain the engine quitting like it did only at long stops and only when hot since it ran great when it did run.

Either way, I have decided to go the route i have and the engine is now apart. We'll proceed with this piece and continue any other troubleshooting as necessary once we have it back together. We will also remove the wiring harness to thoroughly clean all connectors.
 
I have a 1980 gs550l with almost the exact same issue and its driving me crazy! the bike starts right up on choke, idles and revs fine off of choke and then when it gets hot to will start to sputter and die. then it cranks and cranks without acting like it wants to start at all. let it sit and cool down and it starts right up. I am really curious to find out what your problem is. please keep us updated
 
adam290 said:
I have a 1980 gs550l with almost the exact same issue and its driving me crazy! the bike starts right up on choke, idles and revs fine off of choke and then when it gets hot to will start to sputter and die. then it cranks and cranks without acting like it wants to start at all. let it sit and cool down and it starts right up. I am really curious to find out what your problem is. please keep us updated
Click to expand...

We decided to rebuild the top end. I’m posting more about the progress and results in her rebuild thread which you can find here - https://www.thegsresources.com/_forum/showthread.php?216197-Charmayne-s-rebuild-of-her-550L
 
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