Hi Lois
I don’t know what means “pinking” in Costa Rica but I suppose you have any wear in your machine, but without more information I can’t tell you from what. Maybe it’s the valves, the cam, cam chain or the cam chain tensioner. Sorry but I suggest is better if you make a visit to any seriously repair shop.
Try to check the valve clearance and the tensioner, put fresh oil and see.
Here we are waiting for you.
Buena suerte.
Javier
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