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G12 starting #730511
04/01/18 1:55 am
04/01/18 1:55 am
Joined: Nov 2010
Posts: 23
south australia
A
Auzray Offline OP
BritBike Forum member
Auzray  Offline OP
BritBike Forum member
A

Joined: Nov 2010
Posts: 23
south australia
Hi All
I am close to purchasing a 1961 G12 Deluxe and am concerned that it is not a magneto ignition ,It looks like it is a distributor type, can any body tell me if they are fitted with a flat battery emergency circuit ? should you get caught out in the middle of no where !!!!
I live in Auz so it can be a bit remote sometimes, and if it stops supplying a charge to the battery from the alternator I guess that also means will not supply a spark through emergency either ," Im a bit dumb with electrics " .I would have liked it with a magneto really, so can it be changed easily or am I stuck with this ignition system
thanks for any feed back
Ray

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Re: G12 starting [Re: Auzray] #730517
04/01/18 3:07 am
04/01/18 3:07 am
Joined: Mar 2013
Posts: 348
Irene, South Africa
robcurrie Offline
BritBike Forum member
robcurrie  Offline
BritBike Forum member

Joined: Mar 2013
Posts: 348
Irene, South Africa
The G12 should have an emergency switch position which connects the coil directly to the alternator. there is also an emergency charge position which is achieved by connecting the high output coil temporarily by swapping the connections in the (3 wire) alternator harness. You can replace the distributor with a Lucas K2F magneto (which was used on the CS and CSR models).

If the bike was converted to 12 volt subsequently, you will loose the emergency
feature, because the high and low outputs are then connected together and an electronic regulator is normally fitted.

Rob C

Re: G12 starting [Re: Auzray] #731968
04/15/18 4:58 pm
04/15/18 4:58 pm
Joined: Nov 2012
Posts: 676
Isle of Wight, UK
K
koan58 Offline
BritBike Forum member
koan58  Offline
BritBike Forum member
K

Joined: Nov 2012
Posts: 676
Isle of Wight, UK
The emergency start facility was only necessary in the early years because of the additional demand of coil ignition upon the generating system, which employed a feeble alternator.
Once the requirement of the coil ignition is taken into account, the alternator is barely better than the dynamo/magneto setup, but with the major disadvantage that if the charging or battery fall over, the independent magneto is no longer there.
In those early alternator days, the system was on such a fragile balancing point, hence the emergency start option.
In my opinion, any bike with these old alternators would be best advised to fit a later version, go 12V, use a modern reg/rect, then you will have the freedom to choose an ignition system, be it distributor, magneto, or as I prefer, magneto replacement body with Boyer/Pazon etc.


Moderated by  Matchman62 


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