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1967 CB450K0 Black Bomber Rebuild - By Royhall

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Bryanj:
You would need some old price lists to prove that, if you looked up a price and the part needed other modified bits it used to tell you "Must be used with *******" one of the gears in the 500 is like that where the tooth profile changed

royhall:
Thanks Ash that's very kind of you. Unfortunately if I can't unstake it I don't think it would help. Last night I found a guy in USA selling the two sprockets and chain for a 72 CL450, he says it's in good nick but he has nothing to measure it with. As it's only £45 including postage and import charges I thought I would risk it. Looks okay in the pictures so here's hoping. Comes early January so I will leave it alone until then. Just hope the outer is okay.

royhall:
You could probably polish out the three-penny bit marks on the hub, I wouldn't use it like that. Just been reading a post online saying that chatter pushes the metal into tiny peaks that will eventually grab a roller and bend the cap and spring. Once that's happened a roller is held against the revolving hub whilst the engine is running which results in the 10 thou ish wear seen on mine, and also produces a very smooth surface that tricks you into thinking the hubs okay. When I stripped mine originally there were two bent springs and caps so that is probably what happened. He went on to say that ultimately it will grab the hub hard and bend the securing screws and snap off the rotor lugs. I also found slightly bent screws and a very oval dowel hole in the rotor. I think that may be what happened to this sprag clutch as mine fit that scenario perfectly. More ham fisted previous ownership.

AshimotoK0:
I think I  tracked down that sprocket hub you bought in the States Roy and it looks fairly good from the photo's .....  so fingers crossed.
I agree the PO was  ham fisted but in the case of the starter clutch on the K0 Bomber.... every one of them seems to be fooked unless they have been changed for the later parts or the engine is ultra low miles. You see lovely condition bikes for sale at prices around 7k and it says 'electric starter disconnected' ...we all know what that means.

That theory on the indents sound right...the hub from my bike was very smooth but the wear was horrendous in terms of reduced diameter. I reckon Jason's one with indents had effectivily 'grown' in diameter at the high points created.

As a backup .. Graham Curtis has a scrap sprocket hub of mine and is looking into machining it down and shrinking on a  sleeve and grinding it back to the ideal diameter.

royhall:
The parts finally arrived from the USA and the sprocket hub measures 1.661" and looks pretty good condition. There's no wear lip on it and slight chatter marks which indicates it's not too worn. So braved the weather yesterday and got it fitted.

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I fitted a new gasket to try to ensure I'm not going in there again. Not sure what it is with these bomber gaskets, I used a different make this time as the NE ones have all been too big. For some reason this one is even bigger but fits well otherwise. I have trimmed the outside down with a scalpel so I suppose it's better too big than too small. I'm wondering if the Bomber casings are slightly smaller than the K1 onwards items. That may account for it, and another thing to watch out for later. As you can see, a slight slip-up has caused a bit of minor damage to the paintwork which will have to be patched up when the weather is warm enough for painting.

Result, the starter now engages really well and spins the engine at a good speed with plugs in. That has been a difficult problem to overcome due to the complete lack of parts available. My plan is to use this bike in the summer so with that in mind I am starting to collect a box of spare parts to keep it on the road. At the top of that list will be replacement starter/alternator parts as they become available.

As my other bikes in the garage have been reluctant to start in this cold weather (although they all did) I think I may postpone trying to start the Bomber for now as I need to warm it up fully to strobe the timing and that would have to be done outside. No thanks, way too frosty for that I think.

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