| Also known as | 10685 |
| Listed in parts books | Not catalogued by year yet |
PRIMARY CHAIN T120 JAPAN 84L DUPLEX
84-link duplex primary chain, Japan-made, for Triumph 650 twins.
This is a duplex primary chain, an 84-link endless loop that runs between the engine and gearbox sprockets inside the primary chaincase. It's the Japan-made version of the part, distinct from the British-made chain that carries a different suffix, and it shows up in the parts books under the same 60-0477J number with 10685 as an older alternate form.
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The primary chain is what actually transmits power from the crankshaft to the clutch and gearbox, so it takes a beating and stretches over time — that's why the primary chaincase has an adjuster and why chains like this are a routine service item rather than a lifetime part. Catalog listings tie this one to the 650 twin family, including Bonneville and its siblings from that era.
We don't have a lot of extra detail on file beyond the catalog line itself, so give us a call if you want to double check that this is the right length and pitch for what's currently in your chaincase before you order.
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