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1967 CB450K0 Black Bomber Rebuild - By Royhall

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MrDavo:
If its any help I think my CL450 engine almost fit with the chaincase and transmission cover in place, but just fit with them off, I did manage to build it up like this (although the right way up!) but it was a really tight squeeze with the primary cover.



Worth another go when you get them off, anyway, though the 4 speeder may just be different, as you say.

royhall:
Sorry but I don't have any pictures of the engine on the bench before the stripdown started. A bit too excited about getting going and forgot to document it. The first problem was to remove the engine oil that had been sat in there for years. The drain plug was well and truly stuck in there and did not want to move.

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Got the big guns on the job set to maximum with the air pressure maxed out. Still would not budge. Used loads of Plus-Gas and a good bit of heat from the blowlamp. Still nothing. Tried using a hammer and centre punch to jar it loose. Not a chance. In the end we used Plus-Gas and loads of heat, then air gun on max whilst I gave it a good bashing with the centre punch and hammer. Bingo, the thing fairly shot off. Ruined the plug but who cares. Victory.

After that little fiasco I gave all the fasteners a good soak in Plus-Gas ready for the strip down. I tipped the engine back over a tray onto some blocks and what came out of it was beyond belief. The smell of that old oil was terrible, it must have been in there for decades. O for click and sniff forums.

The head and barrels came off quite easily but were all a burnt and nasty mess. It had a seized solid exhaust valve on the left cylinder that took a lot of getting out.

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This is the point that I started to get suspicious about this 26,000 mile engine. The barrels had been bored to maximum oversize and were worn out again. I don't feel that this engine is the one the bike was born with. I have a suspicion that at some point in the bikes layup the engine has been swapped for a dead engine as it was only loosely assembled in the frame This is also backed up by the chain break claim. On inspection there is no evidence whatsoever of a chain break inside the casings. The only damage is the break where the engine number was, and there are marks around the area that look like somebody has removed that part of the casing to get rid of the engine number. Very suspicious, but it is what it is.

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You can clearly see the break in the picture but no marks that would have been caused from a whipping chain end. So until next time this is where I am up to.


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MCTID:
I'll loan you my 6' 4" Son in Law Roy....he's a 16 Stone Football Hooligan - he 'oiked' my Triumph Twin motor back into the frame for me yesterday......effortless.

I'd finished the motor recently ready to go back into the frame when I was struck down by Gout.......ferking awful.....then whilst leafing through the Haynes Manual I spied a 'throwaway' snippet that said the Motor will only go back into the frame 'without the Rocker Boxes fitted' !!!!!!!!!! Bollox bollox bollox...........but I thought if I have to remove the Rocker Boxes it's only a 10 minute job.....anyway it did go back in with them in place, and I only had to do a bit of jiggery pokery....so onwards and upwards.

Looking forward to seeing your build although I have seen the nearly finished Bomber Motor on the bench.........and a thing of beauty it is.

Onwards and upwards !

Sgt.Pinback:
Sorry to ask that question but is its worth restoring that bike?

That will cost a lot (not thnking at the time) and I notced that CB450 parts are even more expensive (and rare) as CB750 K0 parts.

And in the end you will have a nice looking bike with not matching numbers.

royhall:
Just depends what I paid for it in the first place? Plus it's a hobby not a business. It will get used when it's done. As long as it costs less to do than it's worth I'm happy. I will cover the numbers thing later in the thread.

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