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Neils 1978 CB550 F2 Project - Newbie Let Loose
taysidedragon:
--- Quote from: Neilw on February 11, 2026, 02:50:01 PM ---
--- Quote from: Nurse Julie on February 11, 2026, 02:41:31 PM ---
--- Quote from: Neilw on February 11, 2026, 02:33:01 PM ---
--- Quote from: Nurse Julie on February 11, 2026, 02:22:48 PM ---Also, only get the rebore done by someone who understands Hondas tight tolerances. We've retired now but Bryan may be able to do it for you.
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Other than Bryan, do you have any recommendations? Sorry for the stupid question, but would I just send someone the Cylinder head, or would they need more of the engine?
--- End quote ---
You just pack the barrels in a box and send in the post, Parcel Force costs about £12, 48 hour tracked. It was very, very rare for us to see customers, complete engines were delivered by couriers on pallets and heads or barrels came by and were returned by normal post.
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That's brilliant, thank you. I've just spoken to D&M Engineering who work on Classic Hondas, so fit the bill regarding experience.
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They will need the new pistons as well to measure the clearance accurately.
Neilw:
--- Quote from: taysidedragon on February 11, 2026, 06:03:52 PM ---
They will need the new pistons as well to measure the clearance accurately.
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Thank you. i thought it best that they supply them as they can get the correct ones to fit the work they do.
Oddjob:
Personally I would not recommend that. From experience I know that firms take every opportunity to make as much profit as possible. So they’ll supply whatever they can find that makes the most money. They may last but most don’t. 2 years or so later and you need it done again due to a poor job. Do it once and do it right.
Try and find genuine pistons and rings if at all possible. Not as cheap as say Cruzinimage but better quality.
Neilw:
--- Quote from: Oddjob on February 11, 2026, 07:56:25 PM ---Try and find genuine pistons and rings if at all possible. Not as cheap as say Cruzinimage but better quality.
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I've had a good look for NOS oversize pistons and rings as a set, and i can't find any, most sites seem to sell pattern parts. i'll keep looking - are any of the aftermarket brands better than others?
Oddjob:
Have you had the bore measured yet? First oversize 0.25 may not be enough to clear the bore, 0.5 might be a better bet. CMS used to sell the rings in that size although they come in non standard boxes even though they claim they are genuine Honda. I reported them to Honda for that. They are made by the same manufacturer as the genuine rings though. I did have some spare 0.5 genuine Honda pistons but can’t remember how many I have, at least 2 maybe 3.
The other alternative is to risk staying standard. They are shed loads of standard pistons around, second hand as well. Someone on here will have a full set after having a bore. Replace the pistons and buy some genuine standard rings, should be some of those around as well. Use a set of new standard rings and check the end gap and see what it comes out as, still in spec, stay standard. If out of spec then rebore the barrels.
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