| Listed in parts books | Not catalogued by year yet |
PRIMARY FINNED TRI 650/750 - POLISHED FINISH
Polished finned primary chaincase cover for 650/750 Triumph twins.
This is a finned primary chaincase cover, 71-3555FP, made for the 650/750 twins, finished polished. The finned styling is the standout feature here — it dresses up the primary cover with a ribbed look instead of the smooth stock cover, while still doing the same job of enclosing the primary chain and clutch and keeping the oil bath where it belongs.
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The catalog lists it under 650/750, which covers a range of unit-construction twins across that displacement family, so if you're not sure your primary case matches this cover's mounting pattern, give us a call before you order. It also shows up in some records as "FINNED PRMY PLS," same part, shorthand description.
Because this is a cosmetic upgrade piece as much as a functional one, fitment and clearance around the clutch and chain adjuster can be tighter or looser depending on what primary internals you're running, so it's worth double-checking before it goes on the bike.
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