SOHC.co.uk Forums > CB350/400
Engine rebuild Parts list
Bryanj:
As said you can use the tightest tollerance possible and run in carefully, Honda built them so they just neede a short bedding in.
If you do go the tight way oil change at 500, 1500 then every 1500 and no max running till after the 1500
Dolomite_:
Back again. So the new crankshaft arrived and it does look a lot better than the old one.
https://imgur.com/a/IFNfRnb pictures of the codes on the webs
It looks like the codes are 1 1A 1A 1A 1A the crankcase codes are BAAAA.
From looking at my haynes manual I get yellow bearings.
Is that right or wrong?
McCabe-Thiele (Ted):
You need to have the journals measurements to check for for any wear/ovality or is that how you have arrived at Yellow for the conrods from the tables?
Depending on the actual journal size I would re-visit the table probably using either Green or Brown Shells then check each fitment for clearance with Plastigauge.
Not sure there are any Yellows available, blacks can be difficult to find sometimes.
Just my thoughts not gospel, I'm talking about the con rods here not the mains.
Check the main journal dimensions then check the tables for the correct mains colour.
It's confusing as the two tables have the number on a different axis iirc.
I would expect the mains to be Brown for number 1 main then the remainder to be Green. As has been said you can go up a thickness if you run the engine in for a longer period.
More experienced members might confirm my thoughts or disagree - this is why accurate micrometer readings are essential.
When I was in your situation there was an understandable reluctance to confirm colour choices by memebers here - Ken was my guiding light. Bryan or Graham are experienced in this area.
Deano400:
You have written 1 1A 1A 1A 1A 1A in your post. I guess the extra 1A is a typo.
All 1s on the crank and BAAAA will give you 1 Green and 4 Yellow for the mains.
You need to match the letters (4 As) on the crank with the numbers on the con rods to get the big ends.
The letters on the conrods are the weight and should all be the same.
I'm sure someone will put me right if I've got mixed up.
Dolomite_:
What is the base measurement for the mains and connecting rod sizes?
The haynes manual says +x number but plus from what base measurement?
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