CB125T valve guides

ajb235 · Two Stroke Sniffer Joined: 25 Jul 2018 Karma :

I'm fitting new valve guides to my CB125T. I bought the guides from CMS NL, but now realise that they require reaming to size after fitting, and then the valve seats will have to be recut.
This is now a job for a specialist machine shop or engine reconditioned.
Can anyone recommend a good machine shop in the UK who could carry out this work?

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

Cast Metal (soft-ish) guides squeeze closed when forced into place in the head. That's why they need reaming.

Sorry no help with engineers.

You could try Google for an engineering shop.

They are going out of fashion though. 😟
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

jeffyjeff · World Chat Champion Joined: 02 May 2020 Karma :

I've sent cylinder heads out for repair, welding, and resurfacing. You could take the head to your local Honda dealer, but they will likely sublet the job and you will end up paying them to be a middle man. See if you can find a shop yourself. You might google "motorcycle cylinder head repair" and see what comes up. Many shops specialize in automotive head repair. If you contact them, one might refer you to a shop that can handle your CB125T head.
I found this one after a quick google search: https://racehq.co.uk/engine-work/
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History shows again and again how nature points out the folly of men - BOC

steve the grease · Crazy Courier Joined: 26 Jan 2018 Karma :

I would ask at your local classic bike club, Old bikes need constant work to keep them going, someone will be glad to advise.
Or ask at your local 'Motor factors' which is where the trade buy their carparts . Just ask " can you recommend anyone for cylinder head work". Expect " Have you tried Fred Bloggs on such and such street" There will be someone under the railway arches/ back of the industrial estate doing machining, reaming , valve seats etc.
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All the above is my personal opinion, you can see my lips move, but I'm talking out of my arse.
I've been riding, and fixing , bikes for 50 years, in that time the more I learn, the less I am absolutely sure of.....