SOHC.co.uk Forums > CB500/550
Crank not rotating
Oddjob:
You only need 1 set Alex, you just do 1 at a time.
alexdecker:
--- Quote from: Oddjob on May 11, 2022, 02:55:55 PM ---You only need 1 set Alex, you just do 1 at a time.
--- End quote ---
Of course. Sometimes the most simple answers are the hardest to see. I can try and source a pair of yellow shells. Can't seem to find them anywhere, neither CMS or David Silver. Any other good resources for that kind of stuff in Europe?
Can I maybe use a green pair for the same usage?
McCabe-Thiele (Ted):
My starting point was to buy one pair of shells for the most common colour - in your case it looks like brown for the con rods - try them for the brown fitting places using Plastigauge for each one in turn starting with the largest clearance position first. Tricky for your mains as there are no more than two the same.
I understand some folk fit the next thickest shell or even all black shells then take longer to run them in but that sounds wrong to me. I suspect that is why black shells can sometimes be hard to source.
There is a range of acceptable clearances in the tables so I would not stress myself over small differences as long as they are within acceptable range.
Oddjob:
Yellow are hard to find. Green would be ok to use, especially as you'd need a set of green shells anyway if you were fitting new ones. So check them all with the new greens then see what clearances that gives you for each one and work out the correct shell colour for each one.
Using blacks is ok Ted BUT I'd normally only recommend it when all the crank markings are not visible and you can't work out the correct shell. Last time I counted them I had 58 or 59 black main shells and 30 or so conrod ones. Plus a load of yellows and some greens and some browns.
alexdecker:
--- Quote from: Oddjob on May 11, 2022, 08:09:32 PM ---Yellow are hard to find. Green would be ok to use, especially as you'd need a set of green shells anyway if you were fitting new ones. So check them all with the new greens then see what clearances that gives you for each one and work out the correct shell colour for each one.
Using blacks is ok Ted BUT I'd normally only recommend it when all the crank markings are not visible and you can't work out the correct shell. Last time I counted them I had 58 or 59 black main shells and 30 or so conrod ones. Plus a load of yellows and some greens and some browns.
--- End quote ---
So I should basically buy black shells of you and not CMS? 😉
On a serious note though, thank you for the advice. My big end shells are mostly brown, and then one pair of green. Should I buy a pair of brown shells for testing the big ends, or also a green? Do one always go for the biggest size possible for testing?
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