| Diagram | Fig. 4 — Engine: Contact Breaker, Timing Cover, Oil Pump, Oil Pressure Relief Valve · ref 10 |
| Subsystem | engine bottom |
| Listed in parts books | 1973 |
Auto Advance Mechanism
Lucas automatic ignition advance mechanism from the contact breaker/timing cover area of the engine.
This is the automatic advance mechanism from the ignition end of the engine, listed under the contact breaker and timing cover figures. It's a Lucas unit that controls the timing of the spark as engine speed rises, working off the contact breaker cam to advance ignition timing automatically rather than requiring manual adjustment.
Read more
Our catalog record on this one is thin - a single listing tied to 1973. If you're trying to match this against a bike in your shop, bring us the timing cover and contact breaker assembly you have or a good photo, since auto advance units varied and we want to get the right one in your hands.
Call the shop and we'll confirm fitment before you order.
Sorry if we got something wrong here. If you think this information isn't correct, .