SOHC.co.uk Forums > CB350/400

Just checking I’m not going mad! 400/4 conrod shells.

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Oddjob:
TBH Deano the fact the blacks are correct sort of proves the point about fitting blacks in the first place. They have clearly worn to the correct thickness which is essentially what they were meant to do by fitting them in the first place. The green however being the second thinnest shell hasn't been able to do that. You could either try another set of blacks (if you can find any) or fit browns as the next size up.

Deano400:
Thanks Ken,
DS have both Brown and Black in stock at the moment. At £25 a pair I think I'll try one of my current Black sets and see what it looks like using Plastigage. I know it's not ideal as they have some wear already but if they are tight it would probably point me towards Brown, if good clearance then go with Black. If that all makes sense? Any thoughts welcome.

Oddjob:
If you fit Black expect a tight fit with minimum clearance or even less than that. The idea is to do a really careful run in period so the shell wears to the crank, I'd also find it interesting if you fitted a new black shell where the old blacks are and see how they compare in clearance, I'd expect it to change to much less clearance which would prove that's why the PO fitted them. Maybe at the time he couldn't find 4 sets of black shells.

Deano400:
I've fitted a pair of the 'bedded in' Black shells in place of the Green.

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Not tight so I think I'll go with your recommendation Ken and go for Black shells.

Oddjob:
What clearance would new black shells give I wonder, be interesting to find out and would show how much the old blacks wore to suit the crank.

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