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Twin V Triple V sSingle Auto Advance
#782972 08/29/19 7:55 am
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Is there any difference between a Trident , a Twin or a single AAU? I am looking to buy one for my twin. I am guessing that they must be all the same.

Dave

Last edited by dave jones; 08/29/19 3:58 pm.
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Re: Twin V Triple V sSingle Auto Advance
dave jones #783006 08/29/19 6:47 pm
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I've seen 5, 10 and 12 degree AAU's and there could be more. As to which bike used which, you'd have to research. The vast majority of twins used 12 degree advance and the ET ignition bikes used 5 I think.
The AAU's are clearly stamped as to how much advance they supply.
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Re: Twin V Triple V sSingle Auto Advance
dave jones #783007 08/29/19 7:02 pm
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The 5 degree ones were for energy transfer ignition. I’d avoid them (and energy transfer ignition).

As for the others, it doesn’t make much difference.


Amateur Loctite enthusiast.
Re: Twin V Triple V sSingle Auto Advance
dave jones #783011 08/29/19 8:23 pm
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Originally Posted by dave jones
Is there any difference between a Trident , a Twin or a single AAU? I am looking to buy one for my twin. I am guessing that they must be all the same.


The triple AAUs don't have the notch in the taper for the camshaft location pin and the bobweight springs are different but are 12 degrees.

Re: Twin V Triple V sSingle Auto Advance
dave jones #783012 08/29/19 8:28 pm
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Thanks for the answers. Mine is 12 degrees. Thinking about it there can't be any difference between them as long as they advance clockwise. When I have been looking I have avoided ones that had been fitted to a Trident or single and probably missed some good ones.

Dave

Re: Twin V Triple V sSingle Auto Advance
triton thrasher #783013 08/29/19 8:39 pm
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Originally Posted by triton thrasher
The 5 degree ones were for energy transfer ignition. I’d avoid them (and energy transfer ignition).

As for the others, it doesn’t make much difference.


I mean the range in degrees shouldn’t matter. You may want your locating pin and all that.


Amateur Loctite enthusiast.
Re: Twin V Triple V sSingle Auto Advance
dave jones #783045 08/30/19 6:54 am
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FWIW the '72 T120 and T150 AAU are different part numbers.
Makes sense, 38 degrees relative to 120 is different than 38 degrees relative to 180.

Last edited by DavidP; 08/30/19 7:02 am.

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Re: Twin V Triple V sSingle Auto Advance
dave jones #783048 08/30/19 7:41 am
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I didn't notice LAB's point that the trident aau doesn't have the cut out for the pin in the camshaft so wouldn't fit my bike. Looks like only the twin one fits a twin!

Dave

Last edited by dave jones; 08/30/19 7:53 am.
Re: Twin V Triple V sSingle Auto Advance
dave jones #783049 08/30/19 7:41 am
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The advance direction has to be right!


Amateur Loctite enthusiast.
Re: Twin V Triple V sSingle Auto Advance
DavidP #783050 08/30/19 7:42 am
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Originally Posted by DavidP
FWIW the '72 T120 and T150 AAU are different part numbers.
Makes sense, 38 degrees relative to 120 is different than 38 degrees relative to 180.


No, the 38 degrees are part of the 360 degrees of a full circle, in both cases.


Amateur Loctite enthusiast.
Re: Twin V Triple V sSingle Auto Advance
dave jones #783052 08/30/19 7:50 am
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Unit Singles do not have the notch regardless of the badge on the tank, have seen 12,10 and 5 degrees versions.

Re: Twin V Triple V sSingle Auto Advance
dave jones #783053 08/30/19 7:51 am
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Originally Posted by DavidP
FWIW the '72 T120 and T150 AAU are different part numbers.
Makes sense, 38 degrees relative to 120 is different than 38 degrees relative to 180.


No, that doesn't make sense.

Originally Posted by dave jones
I didn't notice LAB's point that the trident aau doesn't have the cut out for the pin in the camshaft so wouldn't fit my bike.


Well then, you'd only have to grind one.....accurately.

Re: Twin V Triple V sSingle Auto Advance
dave jones #783115 08/31/19 2:49 am
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Or shorten the taper and do away with it, just like you would if you were fitting a Boyer etc.


Moderated by  John Healy 

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