SOHC.co.uk Forums > CB500/550
CB125 Pistons/rings suitable for 500/4 ?
AshimotoK0:
I bought some ring sets from a member on here, via eBay, for my 500K0. The early bikes like mine had one piece oil control rings as standard and these were sold to him by CMSNL as a direct replacement for the original ---323---parts (they are ---13011-324-013). He fitted the same sets to his 500K0 and they were fine.
Funnily enough I have been selling off loads of my NOS parts on eBay recently and sold some ---330--- CB125S piston rings to someone. When packing them I found I had a NOS --330-- piston too and checking on eBay, the same part was listed as suitable for the CB500/4 as well as the 125. On inspection that ---330--- piston is EXACTLY the same as a 500/4 ---323--- piston. Anyone else found this to be the case? That got me thinking about the later CB125 piston rings, with 3-piece oil rings. I have six Genuine Hoinda sets of these and they measure EXACTLY the same as the ---323--- 3-piece oil ring sets BUT the oil ring 'spring' part is a different pattern. Any ideas anyone? The CB125 part is 13011-383-000 and the rings have the Riken 'R' mark & the CB500 parts I have are 13011-323-014 and are marked with a 'T' Which manufacturer uses a 'T' mark?
Please don't tell me to go out and buy a set of repros from Cruzinimage Trigg !!
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florence:
I had noticed they were the same. I would have thought that if all the dimensions are the same then they will be fine. Are the 125 ones the same weight as the 500 ones ?
AshimotoK0:
--- Quote from: florence on August 01, 2016, 08:32:35 AM ---I had noticed they were the same. I would have thought that if all the dimensions are the same then they will be fine. Are the 125 ones the same weight as the 500 ones ?
--- End quote ---
Within a few grammes yes but if you use a set of four I reckon that's the best bet.
The thing is that you can pick the 125 parts up for ££££'s less than the 500 parts. A guy on eBay wants 100 quid for some scabby looking NOS --323-- pistons, not even in original boxes. You can pick 125 ones up for 15 quid' ish or less in boxes in pristine condition.
Bryanj:
Not all the 125 pistons fit as some are higher from the gudgeon pin to dome, As to the T and R there were two manufacturers that Honda used (crazy when Sichoro started out making rings) one was Rikken and the marks go to the top, the different spacer is probably the different makers and no reason the wont both work
AshimotoK0:
--- Quote from: Bryanj on August 01, 2016, 03:35:00 PM ---Not all the 125 pistons fit as some are higher from the gudgeon pin to dome, As to the T and R there were two manufacturers that Honda used (crazy when Sichoro started out making rings) one was Rikken and the marks go to the top, the different spacer is probably the different makers and no reason the wont both work
--- End quote ---
Thanks .. I think on the ---330--- 125 pistons the gudgeon pin height is the same but I will check tonight Bryan. not so sure on the ---324--- version, may be different.
This is the guy selling the 330 ones
http://www.ebay.co.uk/itm/GENUINE-HONDA-CB125S-CL125-SL125-CB500-FOUR-PISTON-ONLY-NOS-13101-330-000-/112049309770?hash=item1a16a8c84a:g:bl4AAOSwgY9XfSOv
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