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61 cub ignition #681892 01/19/17 11:52 am
Joined: Aug 2001
Posts: 1,165
Mike Carter R.I.P. Offline OP
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I'm a bit stumped here, trying to change an et ignition out of a 61 cub T20s to electronic ignition and keep the lights without battery can't seem to locate a kit that will do both lights and ignition..any thoughts..

Cheers and thanks in advance

Mike Carter

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Re: 61 cub ignition [Re: Mike Carter R.I.P.] #681894 01/19/17 12:11 pm
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kommando Online Content
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You want this BSA one but for a cub

http://www.electrexworld.co.uk/acatalog/STK-100D.html

but the cub ones they do are only for ignition, space must be a premium under the primary and the STK-100D too large ?

Re: 61 cub ignition [Re: Mike Carter R.I.P.] #681896 01/19/17 12:29 pm
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Mike Carter R.I.P. Offline OP
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Kommando. I've checked them even sent an email (no response) it seems they have igniton only. I was even looking at a 12v conversion but can't seem to find a stator assembly that will work with no battery. Boyer is for a battery system probably could get that to work with battery eliminator but I don't want to guess at parts stator that fits etc.

Thanks

Mike Carter

Re: 61 cub ignition [Re: Mike Carter R.I.P.] #681902 01/19/17 1:46 pm
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tbird649 Offline
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If a Cub alternator can put out 12 volts, then Boyer ignition + Boyer Powerbox will run the bike + lights. I have the same thing on my 500 Triumph. Only go up to a 35W headlight though, or it might not tick over, and unless you get the Powerbox with the extra lighting wire, turn the light switch to off to start engine.



Re: 61 cub ignition [Re: Mike Carter R.I.P.] #681907 01/19/17 2:25 pm
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AngloBike Offline
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I a mess sure that electrix used to do one for ignition only and one that did lights as well?

Re: 61 cub ignition [Re: AngloBike] #681910 01/19/17 2:45 pm
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quinten Offline
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You can use any later Lucas stator / rotor ... and a capacitor
to run a cub ... without a battery .
I run a pazon with a single phase Lucas stator and cap . I think there is one exception .
There are a few RM20 (high output) stators , from the late 60's , that may be to wide to fit ?

Lucas used 70mm rotors in the 50's , at some point (1963?) The standard rotor was changed to 74mm O.D. with 19mm I.D.
When they changed the rotor standard they left the the stators outside dimentions and mounting hole locations 'as before' ... so the parts are backwards compatible (with few exceptions)
Early cubs came with a 70 mm rotor and matching stator .
The only change , on a cub , needed
to use any of the later Lucas stators with 74mm rotors
Is an adapter sleeve and distance piece .
As cubs crank is undersized at 15.5mm and later 74mm rotors have a 19mm hole .


parts needed (fitted from 1963 ? onward) to fit a 74mm rotor .
E4458 Spacing washer
E4455 Woodruff key
E4454 Adaptor sleeve
E4058 Tab washer
E3971 Retaining nut
.

Re: 61 cub ignition [Re: Mike Carter R.I.P.] #681918 01/19/17 3:20 pm
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kommando Online Content
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You have to watch the width of the rotor on a cub as well as the internal and external diameters, normal rotors are 35mm ish wide, some cubs have narrow 27mm wide rotors. Not sure why but space inside the primary must be a reason.

Re: 61 cub ignition [Re: Mike Carter R.I.P.] #681920 01/19/17 3:46 pm
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AngloBike Offline
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Early Cubs had a single row primary

Re: 61 cub ignition [Re: kommando] #681926 01/19/17 4:18 pm
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Mike Carter R.I.P. Offline OP
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Yea Ive got another email into electrix to see if the one they have listed for bsa will work or if they have correct one. got a few stators and rotors here that will fit but will need adaptor for rotor as stated above. this bike has been a pain with the short duration for the spark on a et ignition. seems the cam lobe on the point plate is worn out we can get started but not running past idle without advancing distributor from forums I have checked it all leads to that as we have replaced advance springs etc.


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