| Diagram | Fig. 8 — OUTER TIMING COVER, KICKSTART AND FOOTCHANGE · ref 5 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1972 |
BSA Contact breaker (Lucas 54419097)
A Lucas contact breaker (54419097) that fits inside the outer timing cover to trigger ignition timing.
This is a contact breaker assembly, Lucas part number 54419097, showing up in the parts books under the outer timing cover, kickstart and footchange figures. It lives inside the timing cover on the bottom end of the engine, where it works as part of the ignition system, opening and closing to trigger spark timing off the camshaft or breaker cam.
Read more
The catalog record ties it to appearances spanning 1969 to 1972, but doesn't spell out a specific model beyond that. Given where it sits, it's a mechanical piece, not an electrical accessory, even though Lucas made it.
If you're chasing ignition trouble or a misfire and this is the part your book calls out, check the point gap and cam lobe condition while you're in there. Confirm the number against your parts book before ordering since the catalog doesn't narrow this to one specific model.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
Sorry if we got something wrong here. If you think this information isn't correct, .