| Diagram | Fig. 17 — NACELLE HEADLAMP AND SWITCHES · ref 14 |
| Subsystem | electrical |
| Listed in parts books | 1960–1962, 1964–1966 |
Light unit
Lucas 7-inch headlamp light unit for the nacelle assembly, later superseded by part number 516798.
This is the Lucas headlamp light unit that lives in the nacelle up front, part number 516812. It shows up across the catalog for the headlamp and switches assembly, meaning it's the reflector and lamp unit itself rather than just a bulb or rim. The catalog record covers appearances from 1960 through 1966, and later on Lucas replaced this number with 516798, which is the part to look for if your bike's build sheet or a later parts book lists it under that number instead.
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Inside the nacelle this unit holds the main bulb holder and the pilot bulb holder along with the reflector, so it's the core of the whole headlamp setup rather than a separate add-on piece. If you're chasing parts for an older nacelle-style front end and see either 516812 or 516798 called out, you're looking at the same physical unit at different points in its production life.
We don't have more detail on exact fitment years or wiring specifics beyond what's shown here, so if you're not sure which nacelle or switch configuration your bike carries, give us a call and we'll help confirm before you order.
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