Author Topic: CB125K3 by RGP750  (Read 1364 times)

Offline RGP750

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CB125K3 by RGP750
« on: November 23, 2018, 10:01:22 PM »
Ok taken the engine out of the 125k3  it appears to be seized/stuck,
How do I get the head off, ? I cant seem to find anything on this engine.
Just downloaded a 125 175 manual but it is the later 175 engine (although it says 125k3) Grrr!

I need to split the cam chain but can't turn the engine to get to the link .
Am i having a senior moment ??

Thanks Rich
« Last Edit: November 26, 2018, 05:42:58 PM by SteveD CB500K0 »
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline AshimotoK0

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Re: Help please
« Reply #1 on: November 23, 2018, 10:13:52 PM »
Not sure Rich ..that's a very rare engine ..not the same as the 175's and not a variant of the SS125/CD125/CL125 The man to ask is James Morgan as he's a bit of an expert on that model I think.  I can email you his details (he worked for CMS at one time ...Coastpath on eBay ...he may even have parts to sell.
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline AshimotoK0

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Re: Help please
« Reply #2 on: November 23, 2018, 10:25:40 PM »
Looking at the parts Fiche Rich ...it is in fact  loosely based on the CD125/SS125/CL125 with camchain tunnel down outside and almost identical camchain tensioner arrangement . A long bolt through the head ties the two cam covers together and two bolts fasten the camchain sprocket to the cam. The CD125 engine has a lot of similarities with the earlier Honda Benly engine.
« Last Edit: November 23, 2018, 10:46:54 PM by AshimotoK0 »
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline RGP750

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Re: Help please
« Reply #3 on: November 24, 2018, 06:42:47 AM »
That's great thanks Ash
Is there any way you can get hard copies of the micro files?
I think access to the cam sprocket is by taking off the points back plate and advance bob weights, these are stuck 'they should just slide off the shaft shouldn't they?
Any contact with someone with one would be great.
I PM'd the lead you gave me to the member on here but no reply as yet .
Cheers Rich
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline Menno

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Re: Help please
« Reply #4 on: November 24, 2018, 10:51:55 PM »
I have a cb 125 k6. How much are they similar?

Offline RGP750

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Re: Help please
« Reply #5 on: November 25, 2018, 07:51:33 AM »
Hi Menno
Images of a k6 on Google the engine looks similar.
can you put up a couple of photos one either side of the engine .
Thanks Rich
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline AshimotoK0

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Re: Help please
« Reply #6 on: November 25, 2018, 08:28:18 AM »
Emailed you scans of the CD125 engine manual yesterday, from work Rich. Engine looks very similar apart from points being on the crank on the CD. Basic layout looks the same though.
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline RGP750

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Re: Help please
« Reply #7 on: November 25, 2018, 10:56:52 AM »
Thanks Ash
Just printed them off, hope to have a play later .
Thanks Rich
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline RGP750

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Re: Help please
« Reply #8 on: November 25, 2018, 07:29:32 PM »
A bit of progress.
Stripped the maroon off and the paint was gold and white so that's what it will be .Think the engine may have had some abuse , Tapper cover has no thread and stuck on with what looks like Araldite ,no problem that i have a NOS.
Well need a re bore and pistons,of i can get these out Ouch! looks like a bit of fun coming .
Not taken the cam shaft out yet but lobes look good .  [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ]
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline triplE675

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Re: Help please
« Reply #9 on: November 26, 2018, 03:10:06 PM »
Hi Rich,
               I have restored one and
Manuals for the K3 are rare.
James Morgan was no help to me.
I have a cb175/125 pdf file and a parts book for the K3 in pdf.

I will email them when home tonight if you want them
Regards
Andrew

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Offline RGP750

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Re: Help please
« Reply #10 on: November 26, 2018, 04:29:35 PM »
Oh that's great thanks Andrew.
Cam bearing area is shot , will probably machine out and fit a bronze bush [ Guests cannot view attachments ] .
Chances of finding a head are pretty rare i should think .
cheers for your help .
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline triplE675

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Re: CB125K3 by RGP750
« Reply #11 on: November 26, 2018, 10:00:52 PM »
Hi Rich,
              My pdf files are 10Mb+
And exceed the file size on forum
Not sure how to proceed?
Regards
Andrew
Ps attached is TBM 43J

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Offline Jamesh_sussex

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Re: CB125K3 by RGP750
« Reply #12 on: November 27, 2018, 08:44:20 AM »
Andrew. You can use a free file transfer tool called ‘wetransfer’ to send the files. Go to www.wetransfer.com. You just need rich’s email address..




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Offline RGP750

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Re: CB125K3 by RGP750
« Reply #13 on: November 27, 2018, 08:57:41 AM »
Thanks for that James i'll pm you Andrew
1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline triplE675

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Re: CB125K3 by RGP750
« Reply #14 on: November 27, 2018, 09:09:09 AM »
Thanks James
I should have known because somebody sent files to me using that site

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