Futronix,
as FredXTZ said, could be inlet valve seals, but also could be that cylinder bacame an oval shape, and in that case you need oversize it! I had the same shymptoms and did oversize before aprox. 6000 km. No oil consumption mentioned so far. If in future find out that maybe you realy need an oversize, mail me, I will give you exact infos about tolerances. If go through Croatia, you are more than welcome.
Regards,
AnteK, XTZ 660
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AnteK
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