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My CB250K had phosphor bronze bushes put in as a modification. I replaced them in 1985 with standard ones as they had worn out. I don't know how long they had been in there as they had been done by the previous owner but they looked like a good bit of work. I still have them somewhere, will try to dig them out.
Good progress Ben. That bearing is the worst I have ever seen! The guy who owned the engineering shop I used to use for rebores (now defunct) was working on a cam bearing shell conversion just before he closed down. He was having trouble getting the clearance correct and staying in place and not spinning when the engine got hot. Hopefully someone will be able to advise of the clearance you need.
Read your whole project post again - very interesting rebuild - my heart sank when I saw the camshaft bearing worn oval. How did you fix that in the end ?
Quote from: McCabe-Thiele (Ted) on May 31, 2023, 07:37:42 AMRead your whole project post again - very interesting rebuild - my heart sank when I saw the camshaft bearing worn oval. How did you fix that in the end ?Yeah the camshaft bearing was really bad, considering the condition of the rest of the engine I wouldn’t have expected that, in the end I managed to get hold of a NOS cam bearing, failing that i was going to bore it out and machine a bush. I think it could be done fairly easily, unfortunately I don’t have access to a lathe anymore since I’ve moved jobs, I would like my own lathe at some point and I’ve kept the old bearing so might get chance to have a go in the future, just to see how feasible it is.
Great work Ben. Do you think you will have the bike on the road before the end of summer as the end goal 🙂
Quote from: BenPowell on May 31, 2023, 07:47:28 AMQuote from: McCabe-Thiele (Ted) on May 31, 2023, 07:37:42 AMRead your whole project post again - very interesting rebuild - my heart sank when I saw the camshaft bearing worn oval. How did you fix that in the end ?Yeah the camshaft bearing was really bad, considering the condition of the rest of the engine I wouldn’t have expected that, in the end I managed to get hold of a NOS cam bearing, failing that i was going to bore it out and machine a bush. I think it could be done fairly easily, unfortunately I don’t have access to a lathe anymore since I’ve moved jobs, I would like my own lathe at some point and I’ve kept the old bearing so might get chance to have a go in the future, just to see how feasible it is.So is the bearing separate from the cam cover - lucky to find a NOS part.