| Diagram | Fig. 4 — GEAR CLUSTERS AND TIMING COVERS · ref 102 |
| Subsystem | engine bottom |
| Listed in parts books | 1971 |
Auto-advance unit (99-1007)
A Lucas auto-advance unit for ignition timing, cataloged as 54419653 / 99-1007.
This is the auto-advance unit listed under Lucas part number 54419653, cross-referenced in our records to 99-1007. It shows up in the timing-cover and gear-cluster side of the engine, where the magneto or points assembly gets its ignition timing advanced automatically as engine speed climbs.
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Our catalog record for this one is thin - a single appearance tied to 1971 - so we can't tell you beyond that which specific model or engine family it was fitted to. If you're matching this against what's currently on your bike, best to compare physical dimensions and the mounting arrangement before you order.
Give the shop a call if you want us to help confirm fitment before you commit to this part number.
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.
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