1. Man,.. I wish I had a barn!...
...
2. Are these head bolts,... or head cover bolts?...
3.. You did use some rtv sealer when you put the cover back on?...
c... When I use choke (enrichment),.. I put it on before cranking the bike... because it is a cold day...
...(temps above 75f or so,... you usually don't, or shouldn't need it)... this varies some, depending on overnight temp changes and elevation... but, it don't always need choke... only in cold weather...
...( I explain these things, not assuming your experience, but also for others reading)... I don't know your experience...
Soooo...
Why, are you adding choke after the bike fires?... Is it cold outside?... is this a routine?... is it stumbling?...
Summertime... you likely don't need choke...particularly,.. if it fires up right away without...
...and finally...
You might try this,.. it's worked for me in the past...
In the stripped holes...
Buy a bolt, at least 1 inch longer than the original one,... and thread it down as far as it will go...
Then, check how much further it goes than the stock one...
You may have an extra bit of threads to bite on, that the stock bolt can't reach...
If you do,.. just buy a bolt, slightly shorter than the full thread depth, and see if you can get it to tighten down...
It ain't perfect,.. but, it can last the life of an engine, if there are no problems that require r 'n' r of that bolt too often...
Best luck,
Serow