SOHC.co.uk Forums > CB750
do I need to replace my main bearings
Sp1john:
--- Quote from: McCabe-Thiele (Ted) on November 03, 2022, 05:36:12 PM ---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.
--- End quote ---
hi Ted
thanks for your advice.. I have checked and according to honda they are top limit to slightly oversize. I have a clearance of 0.05 to 0.065mm. but I have heard that some people run them with more oil clearance ..
Sp1john:
--- Quote from: Oddjob on November 03, 2022, 05:42:02 PM ---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.
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thanks for your advice... I did try and post photos with this topic but it wouldn't allow me to.. I know why now
.. thanks👍
Sp1john:
here is the 2 pictures of my dilemma
Oddjob:
Need actual pictures of the face of the shell bearings. They can corrode due to acid in the engine oil over the years, so even though the clearance may be ok the shell could be ruined.
McCabe-Thiele (Ted):
Now that you have split the crank cases imho it would be essential to replace all of the crank shells - mains & big ends.
Not sure if you did a compression test before dismantling, I would also rebore at the same time so A1 crank shells is a must.
Although my experience with petrol engines is mostly car based I would never just fit new rings.
Just my thoughts - now you have the engine in bits replace anything that you can afford. Chains primary drive bearings etc.
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