Author Topic: 1967 CB450K0 Black Bomber Rebuild - By Royhall  (Read 38240 times)

Offline royhall

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1967 CB450K0 Black Bomber Rebuild - By Royhall
« on: February 11, 2019, 08:33:23 PM »
Good evening Ladies and Gentlemen.

I have been thinking about doing this rebuild thread for a few months now and following some prompting from a few SOHC members I have decided to go ahead. A few of you may remember the 350F thread from a few years ago and hopefully this will be a similar format. Apologies if it's a bit similar to Davo's recent rebuild of his CL450, but I feel there are enough differences to make it interesting.

The bike. I bought this bike about 18 months ago from a forum member (anyone that knows him well will spot his front garden). It came with a fair pile of documentation to prove it's history which is never a bad thing. The bike has been stood for a great many years and is generally in pretty poor condition. It has also suffered what was reported to be a chain break which smashed the crankcases, but during the rebuild I shall touch a little bit more on that.

I'm not sure how quickly this one will progress as I don't have anywhere near as much time as I did when I rebuilt the 350F but am hoping for a steady progression. The rebuild actually started about 3 months ago and has been well documented in photo's so I shall try to get this thread up to date fairly soon. That's enough writing for now, so here are the pictures of the bike.

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« Last Edit: February 11, 2019, 08:40:52 PM by royhall »
Current bikes:
TriBsa CCM 350 Twin
Honda CB350F in Candy Bacchus Olive
Honda CB750F2 in Candy Apple Red
Triumph Trident 660 in Black/White
Triumph T100C
Suzuki GS1000HC
Honda CB450K0 Black Bomber
Honda CB750K5 in Planet Blue Metallic (Current Project)

Offline Woodside

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #1 on: February 12, 2019, 07:06:09 AM »
Go for it Roy...personally I love the extra information and pictures   ..
i appreciate the time it takes to put it all together ..thanks

Offline K2-K6

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #2 on: February 12, 2019, 08:07:26 AM »
Also interested in seeing the bike through build Roy.

Appreciate the effort it takes to document process as well as doing it.

Offline Rozabikes Tim

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #3 on: February 12, 2019, 08:10:46 AM »
Yes go for it Roy. Everybodys experience and specific issues with similar bike can vary, as can journalistic input ;D
One day I'll have the time to restore it, not just talk and dream....

Offline JamesH

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #4 on: February 12, 2019, 09:58:16 AM »
Looking forward to seeing this develop Roy. Go for it.

Offline Sgt.Pinback

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #5 on: February 12, 2019, 01:27:15 PM »
another great project here on sohc.uk

Will follow this with interrest
cheers, Uli

Offline Laverda Dave

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #6 on: February 12, 2019, 01:59:32 PM »
It's going to be a good read Roy so I'mooking forward to it.
1976 Honda 400/4
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1978 Honda CB400/4 'Rat' bike
1982 Laverda 120 Jota

Offline royhall

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #7 on: February 12, 2019, 03:24:59 PM »
As I'm struggling for space in the garage at the moment I thought I would start with the engine. Doesn't take up too much space and it's the most expensive lump to do so will be nice to get out of the way. Took a few tools round to the lock-up where the bike is kept and yanked out the engine. It's now that the true state of the bike becomes clear.


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Pretty grotty I think. Beats me why we do this to ourselves really. Anyway the bike will remain in the lock-up for now until I can clear my garage of other ongoing projects. After busting a gut to get the engine into the car, it was transported from the car to the garage in a wheelbarrow. I cannot believe how heavy this engine is for a 450 twin, had to roll it onto the bench. Anyway, stripdown time now but that's for the next thrilling episode.
Current bikes:
TriBsa CCM 350 Twin
Honda CB350F in Candy Bacchus Olive
Honda CB750F2 in Candy Apple Red
Triumph Trident 660 in Black/White
Triumph T100C
Suzuki GS1000HC
Honda CB450K0 Black Bomber
Honda CB750K5 in Planet Blue Metallic (Current Project)

Offline MrDavo

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #8 on: February 12, 2019, 03:54:05 PM »
Quote
Beats me why we do this to ourselves really.

Keeps us off the streets I suppose.

If you have a CB750 engine stand (I have a Trigger one) it will fit straight in as the engine mounting bolt spacing is the same. Now there's an idea for a special, you could have a four pot Bomber (good luck when you get to a corner) or a CB750 with a twin engine...  :o :o :o
« Last Edit: February 12, 2019, 03:56:31 PM by MrDavo »
1969 Honda CL450 'Scrambler'
1974 Kawasaki Z1A
2005 Harley XL1200R Sportster
1985 Porsche 911 3.2 Carrera Sport
1978 VW Bay Window camper van

Offline royhall

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #9 on: February 12, 2019, 05:09:35 PM »
Must fit the later models better Dave. Tried my 750 Trig stand, it was close but not close enough to use.
Current bikes:
TriBsa CCM 350 Twin
Honda CB350F in Candy Bacchus Olive
Honda CB750F2 in Candy Apple Red
Triumph Trident 660 in Black/White
Triumph T100C
Suzuki GS1000HC
Honda CB450K0 Black Bomber
Honda CB750K5 in Planet Blue Metallic (Current Project)

Offline MrDavo

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #10 on: February 12, 2019, 06:26:44 PM »
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.
1969 Honda CL450 'Scrambler'
1974 Kawasaki Z1A
2005 Harley XL1200R Sportster
1985 Porsche 911 3.2 Carrera Sport
1978 VW Bay Window camper van

Offline royhall

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #11 on: February 12, 2019, 08:53:52 PM »
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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« Last Edit: February 12, 2019, 08:57:38 PM by royhall »
Current bikes:
TriBsa CCM 350 Twin
Honda CB350F in Candy Bacchus Olive
Honda CB750F2 in Candy Apple Red
Triumph Trident 660 in Black/White
Triumph T100C
Suzuki GS1000HC
Honda CB450K0 Black Bomber
Honda CB750K5 in Planet Blue Metallic (Current Project)

Offline MCTID

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #12 on: February 12, 2019, 11:57:32 PM »
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 !
Now: 2008 CB1300S, CB750K4, 1970 Bonneville. Various other 1960's 650 Triumph T120's/ TR6's/ TR6C's (all in bits...many, many bits unfortunately). Previous: 2007 CB600FA, 1976 CB500 Four. BMW F800ST. GS750E. ZZR1100. CB1300 (2). ZXR1200S. VFR800. CB750 Nighthawk. CX500. XS500 Yam. Suzuki GT500. BSA A10. Various Lambrettas. Zundapp Bella (honest).

Offline Sgt.Pinback

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #13 on: February 13, 2019, 09:17:44 AM »
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.



cheers, Uli

Offline royhall

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Re: 1967 CB450K0 Black Bomber Rebuild - By Royhall
« Reply #14 on: February 13, 2019, 10:11:57 AM »
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.
« Last Edit: February 13, 2019, 11:33:10 AM by royhall »
Current bikes:
TriBsa CCM 350 Twin
Honda CB350F in Candy Bacchus Olive
Honda CB750F2 in Candy Apple Red
Triumph Trident 660 in Black/White
Triumph T100C
Suzuki GS1000HC
Honda CB450K0 Black Bomber
Honda CB750K5 in Planet Blue Metallic (Current Project)

 

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