| Listed in parts books | Not catalogued by year yet |
PRE UNIT C/S SPROCKT 20T
A pre-unit gearbox sprocket, 20 tooth, part number 57-0471/20.
This is a pre-unit gearbox sprocket, 20 tooth, listed under 57-0471/20 (also shows up in our records as SPR-PU20T). It mounts on the gearbox mainshaft and carries the primary chain out to the clutch, so it's a wear item worth checking whenever you've got the primary chaincase open.
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The catalog entry we have on this one is brief and doesn't tie it to a specific model or year beyond confirming it's a pre-unit fitment. If you're matching this against a gearbox mainshaft or primary chain, bring your measurements or the old sprocket in and we'll confirm it's the right tooth count and fit before you order.
Given how thin our records are on this part number, call the shop if you want us to double check anything beyond what's stated here.
Sorry if we got something wrong here. If you think this information isn't correct, .