| Also known as | 70 6283, E6283 |
| Diagram | Fig. 11 — CHAINCASE AND CHAINS · ref 9 |
| Subsystem | primary |
| Listed in parts books | 1966–1970, 1974 |
TENSIONER BLADE, TRIUMPH 500/650
Primary chain tensioner blade for Triumph 500/650 twins, keeps the primary chain properly tensioned inside the chaincase.
This is the primary chain tensioner blade for Triumph 500 and 650 twins, part number 70-6283, also seen as E6283 in older parts book listings. It lives inside the chaincase where it rides against the primary chain, taking up slack as the chain wears and stretches so the chain doesn't slap around or run loose against the cases.
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This one has a cutaway at the front that distinguishes it from the later 650-only tensioner blade used on the T120 line. The catalog shows it appearing across chaincase and chain listings from the mid-60s into the early 70s, but confirm which blade your chaincase actually takes before you order since Triumph used more than one style through the years.
If you're pulling the chaincase apart for a chain adjustment or a general primary overhaul, it's a good idea to look at this blade closely for wear or cracking at the same time - it's a simple part but an important one for keeping the primary chain running quiet and properly tensioned.
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