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Doms CB550F1 project

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DomP:

--- Quote from: Bryanj on March 03, 2024, 02:20:25 PM ---Some wear is frequent, those look fine to use to me

--- End quote ---

That's a relief Bryan, I've reassembled them😀

DomP:
I began assembling the top end tonight, I've staggered the piston ring gaps if this really makes any difference as I've read they are known to naturally rotate in use, laid the gasket on with its orings and oil jets (got them upside down to begin with) then lowered the barrels over and fed #2 and #3 then #1 and #4 piston into their bores.  Leaving the 20mm gap I then inserted the cam chain guide and slackened off the tensioner and fitted it making sure it as in the pocket in the crankcase.

Having had the barrels skimmed I'm hoping the orings in the top of the oil jets will be sufficiently fat enough to prevent leaks.  I've fitted the head gasket and dropped the head on, at this point I'm going to ask if I'm missing anything?  I've got new pucks from Julie to fit s well.

davidcumbria:
With a vesrah gasket I did upsize the o rings so looked a bit tighter than yours, allowing for the squish. Pretty sure I used 2.75 thickness in viton but can’t be sure. I know I didn’t use the vesrah ones. Head was not skimmed. No leaks so far. I thought it’s  It s worth trying a few sizes to see how they look because they  are so inexpensive and having to remove head again is a big expensive job.

 The po had fitted the oil jets upside down on my bike, not realised and actually damaged the seat in the barrels - amazed it wasn’t leaking.

DomP:
Yes I agree David, I might order some today, can you recall the internal diameter of them?  I'm at work so can't measure

Bryanj:
As you have skimmed the block you dont need oversize O rings as the pockets are shallower so the ones you have will squish more.
Too much might close the hole a bit.

Rest of it looking good mate

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