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Cyclinder rebore services in greater London?

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Athame57:
The workshop just got back to me to tell me I will need a rebore or a different cyclinder block, unless someone here has a CB400F2 cyclinder block for sale the only one I can on the web find is aweful.
Can anyone reccommend a place to get that done in Greater London. The quote I got from the one firm discovered so far is £140.00 plus vat for a first rebore.
However, how can I be sure it is a first rebore, is there a way of telling from pistons or something?

Nurse Julie:
You won't know what + size over rebore is needed until a rebore is done. That's why you never order piston and ring kits until you know which size you need. Don't bother going +0.25 over, its not worth it, if it doesn't clean up at +0.50 then you'll need to go bigger. Has the garage actually taken the top end apart to see what has happened or is this guess work?

Bryanj:
Yes, but its easier to measure the bore, i can rebore it for you if you wish and import pistons from Japan, quick guess is £140 for 4 piston kits(piston, rings,pins, circlips) plus rebore and postage.
You have to be carefull with these as piston to bore clearance is very tight and most car engine builders get it wrong.
Piston kits from cruzinimage are available in 0.5 and 1.0mm oversizes.
You can email me direct addy is in my profile

Bryanj:
There are 2 blocks on fleabay, 1 at 58 plus 6 postage the other over 100.
Both look like they need boring, which can be done, get in contact and let me know

Athame57:

--- Quote from: Nurse Julie on August 13, 2025, 04:15:07 PM --- Has the garage actually taken the top end apart to see what has happened or is this guess work?

--- End quote ---
I'll be going there tomorrow morning Julie, it's heaving down with rain here now so not today!

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