That's really bad the new cam worn off. Brass is not the right material for gears. I would have asked for a refund to be honest.
One thing I noticed on mine was the vavle covers in the crankcase were not moving up and down easily . I have to sand them off to have a free movement. I think that might have caused the wear on yours and mine.
New cam shaft seems to holding okay. How do you set the valve setting? Through the screw on the lifter at the bottom?
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