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2003 Honda CR125r exhaust valve bearing

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Hi there! I have a 2003 CR125r that needed an engine rebuild. I wasn't thinking when I tore the motor apart and misplaced the exhaust valve bearing.(the bearing on the cylinder)  It appears to be NLA from Honda for some time. I was hoping someone had the part number so I might find it NOS or at least the dimensions so I can get from a bearing supply company. Or any other ideas. 

Thanks in advance.  

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#16 correct? Strange that it's not listed as available. I could try to get measurements with my calipers tonight after work when I get home if you need them and can't source a comparable size. Not sure on the bearing part number S.O.A.N.Z listed as the numbers in parentheses seem to be in mm and sounds awfully large. Looking at the microfiche for the right side case where the waterpump shaft bearing resides lists bearing:




7mm ID x 19mm OD x 6mm wide is how I would read that.....the 19mm part is what throws me off. I can't imagine that bearing being that large in diameter sitting here thinking about it.



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