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question manual advance on mag #495255 06/24/13 9:41 am
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Red Lapierre Offline OP
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when timing is it in the advance position normally or when you pull lever? I just want to check I timed correct.Never had manual always auto and you wedge it for full advance.
Thanks Red


57 A10 GF
61 A7
61 A10 GF
63 A10 SR
76 CB 125 Honda
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Re: question manual advance on mag [Re: Red Lapierre] #495259 06/24/13 10:10 am
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Peter R Offline
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Red, this depends on what type of magneto you have, and if the position of the advance cable input is on the forward or aft side of the magneto.
If this sounds confusing, you can check with the follwing method:

Remove the cover of the contact breaker, and determine in which direction the contact breaker rotates when the engine is turned in the normal direction of rotation.

Take a look at the backplate (this is situated behind the contactbreaker). This backplate has a small ramp that opens and closes the conactbreaker.
Operate the manual advance/retard lever.
If the ramp on the backplate moves towards the contactbreaker(seen from rotational direction of the c/b) the ignition is advanced.
If the backplate moves away from the c/b, the ignition is retarded.

In other words: if the backplate is moved in the opposite rotary direction as as the contact breaker, the ignition is advanced, and of course, if the backplate is turned into the same direction as the contact breaker, the ignition is retarded.

Use the fully advanced position for adjustment of the ignition timing.
It may sound a bit complicated, but if you take a close look at the magneto / contact breaker, it will become clear.

Hope this helps.

Last edited by Peter R; 06/24/13 7:12 pm. Reason: add info

Peter.
1974 Commando 850
1972 Trident T150T
1961 Goldie DBD34
1969 Benelli 250 sport special
Re: question manual advance on mag [Re: Red Lapierre] #495317 06/24/13 7:31 pm
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Red Lapierre Offline OP
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Peter
Mag is a #42413A AC
contact breakers moves in a CW direction looking at them motor running.
The back plate move CCW direction when lever is operated.
Which looks like it makes points open earlier which I think retard timing for easier starting.

Red


57 A10 GF
61 A7
61 A10 GF
63 A10 SR
76 CB 125 Honda
76 FLH
2012 FLHTP
Re: question manual advance on mag [Re: Red Lapierre] #495318 06/24/13 7:34 pm
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triton thrasher Offline
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Originally Posted by Red Lapierre
Peter
Mag is a #42413A AC
contact breakers moves in a CW direction looking at them motor running.
The back plate move CCW direction when lever is operated.
Which looks like it makes points open earlier which I think retard timing for easier starting.

Red


No! That's advancing the timing.


Amateur Loctite enthusiast.
Re: question manual advance on mag [Re: Red Lapierre] #495320 06/24/13 7:37 pm
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Red Lapierre Offline OP
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So I will have to ride with this lever operated for full advance position?


57 A10 GF
61 A7
61 A10 GF
63 A10 SR
76 CB 125 Honda
76 FLH
2012 FLHTP
Re: question manual advance on mag [Re: Red Lapierre] #495325 06/24/13 8:21 pm
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Rickman Offline
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Afternoon Red,
Thanks again!
Yes, that's the way my Super Rocket operated.
Tensioned=advanced, slack=retarded.

Brett

Re: question manual advance on mag [Re: Red Lapierre] #495326 06/24/13 8:40 pm
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Red Lapierre Offline OP
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Thanks to all.


57 A10 GF
61 A7
61 A10 GF
63 A10 SR
76 CB 125 Honda
76 FLH
2012 FLHTP

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