| Also known as | ID12-020 |
| Listed in parts books | Not catalogued by year yet |
PISTONS 500 58-66 +020JCC
A +.020 oversize 500cc piston (JCC type), covering 1958-66 per the catalog listing, also known as ID12-020.
This is a JRC piston for a 500cc engine, listed in a +.020 oversize for a rebore. The catalog entry marks it as covering the 1958 to 1966 span in JRC's own records, and it carries the JCC piston-crown designation from that same listing. It also shows up under the alternate reference ID12-020, so if your parts book or an old invoice uses that number, it's the same piston.
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The catalog record here is brief and doesn't spell out which model this piston was fitted to beyond the 500cc displacement and the 58-66 year span noted in JRC's own listing. If you're rebuilding a 500 twin and need to match bore size, ring type, or gudgeon pin fit, it's worth having your cylinder in hand or measured before ordering.
Give the shop a call with your engine and cylinder details if you want to confirm this is the right oversize and profile for your rebuild before you buy.
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