Points Gap ??.

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Donegal Cub
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Points Gap ??.

Postby Donegal Cub » Sun Jul 05, 2015 11:07 am

Hi all, I have a 48 cub which gets its power supply from a 12 volt battery it has an external coil and condenser. My query is should the points gap be 0.020, instead of the normal 0.013 when it has a mag supply the spark.?? Thanks in advance guys :thanx:
Bernard,
Donegal Cub.

Eugene
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Re: Points Gap ??.

Postby Eugene » Sun Jul 05, 2015 11:16 am

.013, assuming we are discussing a magneto that has been converted to an external coil.
I have an excuse. CRS.

Donegal Cub
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Joined: Fri Apr 06, 2012 6:30 pm
Zip Code: 00000

Re: Points Gap ??.

Postby Donegal Cub » Sun Jul 05, 2015 4:59 pm

Hi Eugene,
I do not know enough about electrics to clarify. There is a distributor mounted to the mag. All I know is if I disconnect a lead from the battery the engine will die. The generator is by passed and has no function, the black box on top of the mag is empty ( no coil etc ) and she gets her power from a 12 volt battery which has to be kept charged up on my charger from time to time. And as stated she has an external coil and condenser. Don't know if the extra info will change the answer you gave. Many thanks, :thanx: :thanx: .
Bernard,
Donegal Cub.

Eugene
Team Cub Mentor
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Posts: 16108
Joined: Fri Jul 02, 2004 9:52 pm
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Location: Mo. Linn

Re: Points Gap ??.

Postby Eugene » Sun Jul 05, 2015 6:04 pm

Still .013".
I have an excuse. CRS.

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Rick Spivey
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Re: Points Gap ??.

Postby Rick Spivey » Mon Jul 06, 2015 2:09 pm

It stays at 0.013" for a magneto, even when converted to external coil, because that keeps the timing correct. Changing the gap to 0.020", like a true battery ignition distributor, would alter the timing of the magneto to be incorrect for the cub. Its all about timing, not where the spark comes from. Hope that helps clarify the answer a bit more.
Rick Spivey
'52 Cub ("Great Personality") 148xxx
'48 Cub with FH ("Gunny Cub") 38xxx
'57 Lambretta (a slow work in progress)
'74 Triumph TR6 (Mama's toy)

Donegal Cub
5+ Years
5+ Years
Posts: 725
Joined: Fri Apr 06, 2012 6:30 pm
Zip Code: 00000

Re: Points Gap ??.

Postby Donegal Cub » Mon Jul 06, 2015 2:19 pm

Thanks Rick


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