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50mm bores are so small that few shops have a suitable boring bar. Another interesting issue is that the liners often push out when they are machined, so ask the machine shop to go slow and avoid heat. I think that Bill Bune Enterprises in Anoka MN can do those small bores. And I am pretty sure that my guy Nydhal Crank and Machine has a small boring bar. I fitted a pair of Hap Jones 2mm O/s pistons in the last CB160 I built. I can check and see if I have a spare set if that's of interest.
Interesting, thanks for the info. I’ll give them a call and see what they say. I’ll be in touch when I talk to them and the daughter…appreciate your suggestions!
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