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08 CRF250R Motor Noise, Top End???

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08 model w/ 40 hours on the clock, developed a motor noise that increases w/ rpms. Using stethoscope method noise is loudest at base of cylinder rt side. tore down top end. Valves are in spec, cylinder looks like new,cylinder, piston,wrist pin measure within spec. No rod play up/down, no brass in oil or filter. oil changed every 2 hours, 5 on tranny. checked clutch basket and dampners all is good. Are counter balance shaft failures common. Whats next step:banghead:

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