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AUTO ADVANCE UNIT 12 DEGREE 6CA TYPE

SKU: 54427182
Quantity: Price: $85.00





AUTO ADVANCE UNIT 12 DEGREE
6CA type
NOS LUCAS

THIS CAN BE USED ON EARLIER BIKES THAT USED THE 4CA AAU AND POINTS PLATE WITH THE CONDENSER ON IT. ONE JUST NEEDS TO SWAP OUT THE POINTS PLATE WITH A 6CA TYPE. THIS WILL ENABLE MUCH EASIER ADJUSTMENTS AND WILL ALSO ALLOW THE CONDENSER TO BE MOUNTED IN A REMOTE LOCATION OUT OF THE POINTS CAVITY. MUCH EASIER TO REPLACE THE CONDENSER IF IT IS A REMOTE LOCATION. USE LATER CONDENSER 54441582


This cam can be used in place of 54419653 15 degrees


Given that the timing is set at the full advance position the engine would run fine at the top end.


Some unit single enthusiasts feel the 12 degree AAU is an improvement over the 15 degree AAU. This is specially true if you time 28 degrees full advance BTDC as suggested for the earlier Victors, as the 15 degree cam actually retards to 2 degrees past TDC. You may have to slow your tick over down on the carb but it certainly won't harm and may even accelerate better.


If you want to increase the retard to 15 degrees:

Measure how far the pin travels in the limiting slot (leading edge of the pin to where it stops at full advance) and multiply that amount by 1.25 to get the total travel of the pin you need to go from 12 to 15 degrees.
A 12 degree AAU has about 0.134 inches movement for 12 degrees. Therefore you need to go to a total of 0.167 (add 0.033) for the pin movement to get 15 degrees.


Models we have parts for: C15 Star, C15T Trials, C15S Scrambler, C15SS Sport Star, C15 Pastoral, C15 Starfire, C15 Roadster, B40 Star, B40SS Sport Star, B40 Enduro Star,B40 Roughrider, WDB40, BSA 441,B44GP Grand Prix, B44 Enduro, B44 Victor, B44 Victor Special, B44 Roadster, C25 Barracuda, B25 Starfire, B25 Fleetstar, B44 Shooting Star, B25T, B25SS, B50SS, B50T Trail, B50MX, TR25W Trophy, T25T