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1967 CB450K0 Black Bomber Rebuild - By Royhall
AshimotoK0:
--- Quote from: royhall on November 23, 2020, 04:16:45 PM ---Thanks for that Ash. The plot just thickened a bit read below.
CB450 K4 vs K5 alternator rotor swap- beware!
--- End quote ---
I think have heard about the keyway issue before Roy but I think Nigel Harris actually has a K5 setup on his Bomber and he's been into Bombers for a really long time, so I need to ask him if he modified anything to get everything to work reliably. It's a case of possibly modifying later parts or ditch having an electric starter altogether. The chances of finding decent K0 parts is pretty slim.
royhall:
I have been trying to compare your two rotors from the picture. The timing marks look the same in relation to the keyway but it is a bit hard to be sure. He's talking about a 20 degree error and it doesn't look anything like that. The part I need is really 31101-283-013 which covers later K0 to K4. Which one do you have there marked K0? Could I ask a big favour Ash, if I pay the postage both ways could I borrow both rotors to make sure my other parts fit. If it's certain that's the right part I will buy a new one from the pirate but need to be sure first as it's an expensive part. Cheers.
AshimotoK0:
--- Quote from: royhall on November 24, 2020, 08:16:22 AM ---I have been trying to compare your two rotors from the picture. The timing marks look the same in relation to the keyway but it is a bit hard to be sure. He's talking about a 20 degree error and it doesn't look anything like that. The part I need is really 31101-283-013 which covers later K0 to K4. Which one do you have there marked K0? Could I ask a big favour Ash, if I pay the postage both ways could I borrow both rotors to make sure my other parts fit. If it's certain that's the right part I will buy a new one from the pirate but need to be sure first as it's an expensive part. Cheers.
--- End quote ---
OK.... pretty heavy though ...and I will need to pack pretty well as the NOS 500T one owes me a few bob. The Bomber one is Jason's (Woodside on here) as we pooled our spare parts to try to come up with two sets for each of our bikes. Graham Curtis is looking into re-bushing the sprocket part for us using a hardened sleeve. He's just made a beautiful job of rebuilding a Bomber crank from one I donated to him.
https://www.facebook.com/groups/19998773432/permalink/10158733868393433/?comment_id=10158734015688433&reply_comment_id=10158734043888433
royhall:
Just measured my rotor and its quite a way off the CB500 item. How confident are you with the measurements as mine is very close to the K0 one but not bang on measured with a micrometre. If you used a vernier that may be the difference. Do you think you K0 rotor is part number 31101-283-013 for the later K0? Can I go ahead and borrow the K0 rotor just to try the clutch mechanism and check the timing marks etc before I shell out big money. I can have it back to you fairly quickly, probably as soon as silvers can deliver from the USA warehouse. Let me know the postage and I will get it to you. I don't think there's much point sending the 500T as the sizes are off. Cheers.
AshimotoK0:
Hi Roy no worries it's over 2kg packed so I may as well send you the two K0 ones I have to compare late & early. (see pic)
I wonder if a knackered late sprocket wheel hub could be machined down to the size to fit the smaller aperture rotor and then hardened.
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