SOHC.co.uk Forums > CB750

do I need to replace my main bearings

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Sp1john:
hello everyone.. I am john from Nottingham in the UK..  I have had a honda cb750 f1 (28000 miles) now for 15 years with the intention of rebuilding the bike.. av finally got round to do it 🙄.. the engine has done 28000 miles and is in now in bits.. I have plastigauged the main bearings.. this is reading 0.05 to 0.63mm.. can anyone give me some advice on weather this is ok.. also I am in need of a set of std rings any advice as to we're I can get them from .. the piston has 392 in the casting next to the pin.. thanks john

Johnny4428:
Hi John welcome to the forum! There is very helpful and knowledgable people on here as well as very experienced that will advise. That’s why I’m not going to offer my help 🤣

McCabe-Thiele (Ted):
A good starting point is to download the manual here (unless you have done that) then see how the crank journal tollerances look in the tables. Check you bearing codes if the colours are visible.

Oddjob:
It depends on condition of the bearing surfaces as well John, when you have 5 posts then put up a pic of them, mark each one before removal, they MUST go back in the same place they came from.

Sp1john:

--- Quote from: Johnny4428 on November 03, 2022, 05:17:36 PM ---Hi John welcome to the forum! There is very helpful and knowledgable people on here as well as very experienced that will advise. That’s why I’m not going to offer my help 🤣

--- End quote ---
😂👍thanks for the welcome.. forum's like this one are invaluable.. 👏

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