Ali
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Hello Kevin, maybe it is interesting you, that 6 years ago the same damage happend to my engine, in my case it was not Oil starvation to the head (as it was in your case) , it was caused by myself. After controlling the camshaft i fixed the screw that holds the sprocket with loctite. I did that because i thougt it was mentioned in the yamaha manual, maybe it was not. A bit of the glue closed the little oil-hole in the camshaft. I went 50 Kilometers and then came that squeezy noise. Since then i use norm -type bearings (6202 as i remember) instead of the Alloy -rings . No problem up to now.
Regards Ali
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