CB-1 Mk2

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CB1pod70
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CB-1 Mk2

Post by CB1pod70 » Mon Feb 12, 2018 3:52 pm

Since the demise of Photobucket, there doesn’t seem to be many people posting projects on the forum so I figured I’d start this thread using Flickr to host the images & hopefully inspire a few of you to do the same.
Ok, so here is the latest project a CB-1 mk2. Although I’ve worked on a mk2 before, this is the first one I’ve owned, although it was never really planned for it to come into my possession.
Back in the summer it was posted on the Facebook page and the owner was looking for some help getting it back on the road after a minor crash. The bike had gone down on its left hand side but what caused the damage was that it went under an oncoming vehicle which smashed the clutch cover. As he was fairly local I offered to pop over and help him make a list of parts needed that I should be able to supply from my stash of bits.
As the parts list grew and the amount of work and money mounted up, he decided that it wasn’t worth repairing and that he would sell it for parts. A deal was struck and the bike was wheeled into the back of the van and then sat in the shed for quite a few months until I was finally able to get round to sitting it on the bench and looking at it. The plan was for it to be a little project over the Christmas break but life in general and my other bikes had other plans……
ImageDSCF0774 by pod_70, on Flickr
ImageDSCF0772 by pod_70, on Flickr
The plan is to go through the bike sorting out any issues and get it back on the road again. It’s only going to be a clean-up and repair rather than a full on restoration. Sure I’ve said this before about other projects….
Last edited by CB1pod70 on Mon Feb 12, 2018 3:55 pm, edited 1 time in total.

CB1pod70
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Re: CB-1 Mk2

Post by CB1pod70 » Mon Feb 12, 2018 3:53 pm

The first job was to get it on my homemade ABBA ish stand through the front engine mounts to raise the front end (my ABBA stand is too wide for the bench). The plan is to start at the front and work my way back.
ImageDSCF0777 by pod_70, on Flickr
Something that definitely needs to be replaced is this exhaust – it looks like something that should be fitted to the underside of a Nissan Micra, not the side of a bike. It doesn’t look home-made either as the headers aren’t standard CB-1 so I have no idea where it could have come from. Fortunately I have a decent original exhaust to fit.
ImageDSCF0776 by pod_70, on Flickr

CB1pod70
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Re: CB-1 Mk2

Post by CB1pod70 » Mon Feb 12, 2018 3:54 pm

Here’s the main damage. It looks worse than it is and there is no play or obvious damage to the end of the crank as a result. You can see the bent brake pedal which will also need to be replaced.
ImageDSCF0775 by pod_70, on Flickr
The clutch cover was removed and binned and the sump dropped for cleaning and inspection of the bottom end of the engine. A replacement flywheel & woodruff key have been fitted and while I was there I pulled the clutch to check the condition of the plates (all good).
There was some discussion on the Facebook page about using the £10 Chinese gasket sets off Ebay etc. The previous owner had bought a set and gave them to me with the bike but here are some photos which should explain why I won’t be using them.
ImageIMG_0504 by pod_70, on Flickr
ImageIMG_0461 by pod_70, on Flickr

The Front brake was seized on solid so this was removed (eventually) and stripped for cleaning and rebuild. The pistons have come up fine with a clean & polish so I just need a new set of seals.
ImageDSCF0778 by pod_70, on Flickr

Foxy400
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Re: CB-1 Mk2

Post by Foxy400 » Sun Mar 11, 2018 11:23 am

Always impressed when someone is competent enough to take on something like this. So where are you up to?

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royster81
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Re: CB-1 Mk2

Post by royster81 » Sun Mar 11, 2018 10:51 pm

I'm following this, keep the momentum going.
It's not having what you want but wanting what you've got....Loud ,Proud and Modified ....

CB1pod70
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Re: CB-1 Mk2

Post by CB1pod70 » Mon Mar 12, 2018 12:49 pm

Unfortunately It has been pushed to one side again while I get the CBR ready for the race season and rebuild the engine on the pitbike but I should be back at it soon ;)

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jim157
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Re: CB-1 Mk2

Post by jim157 » Mon Mar 12, 2018 5:33 pm

Is there much difference between a mk1 and a mk2? I always fancied a cb1....
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CB1pod70
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Re: CB-1 Mk2

Post by CB1pod70 » Tue Mar 13, 2018 3:03 pm

As far as I can tell, on a mk2 the forks are slightly longer, the handlebars higher (well it was aimed at the American market!), more tank capacity & a smaller airbox as a result and I think the seat is slightly deeper but that's about it. If I find anything else I'll post it here.
They're great little bikes with a slightly softer tuned engine than the NC23 which it shares a lot of parts with so parts aren't generally an issue.
Other than the usual Honda regulator issue and a tendency for the front engine mounts to seize in the cases, there's very little to fault them on

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Re: CB-1 Mk2

Post by CMSMJ1 » Wed Mar 14, 2018 4:28 pm

jim157 wrote:
Mon Mar 12, 2018 5:33 pm
Is there much difference between a mk1 and a mk2? I always fancied a cb1....
I'll flog you a cheap one.... ;)
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jim157
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Re: CB-1 Mk2

Post by jim157 » Wed Mar 14, 2018 9:32 pm

CMSMJ1 wrote:
Wed Mar 14, 2018 4:28 pm
jim157 wrote:
Mon Mar 12, 2018 5:33 pm
Is there much difference between a mk1 and a mk2? I always fancied a cb1....
I'll flog you a cheap one.... ;)
I didn't realise you had one?
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