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1970 a65 thunderbolt won't kick start with low bat #751948
10/08/18 3:44 pm
10/08/18 3:44 pm
Joined: Apr 2016
Posts: 10
PA
J
Joshy Offline OP
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Joshy  Offline OP
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J

Joined: Apr 2016
Posts: 10
PA
Greetings all I have a question about my charging system. The bike let me sit and the battery was dead and since it's a couple years old I bought a new battery. However the new battery dies after short riding and much quicker if the head light is on. If I'm riding at speed the bike won't die, but as soon as I stop anywhere it will cut off. It will not run without the battery charged. Shouldn't these bikes start via the kick start without a battery? Any suggestions on why the battery is not being charged? I did some searching but didn't heave much luck. Thanks

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Re: 1970 a65 thunderbolt won't kick start with low bat [Re: Joshy] #751952
10/08/18 4:03 pm
10/08/18 4:03 pm
Joined: Feb 2003
Posts: 2,951
Ohio
R
Rickman Offline
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Rickman  Offline
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R

Joined: Feb 2003
Posts: 2,951
Ohio
May I ask at what RPM you usually ride the bike at?

Secondarily, have you checked the charging system is actually charging?

And, may I ask if you have the battery properly grounded? ( positive + ground?)

And no, without a battery, most A65's will not start.

Last edited by Rickman; 10/08/18 4:05 pm.
Re: 1970 a65 thunderbolt won't kick start with low bat [Re: Joshy] #751953
10/08/18 4:04 pm
10/08/18 4:04 pm
Joined: May 2013
Posts: 5,004
Rotherham - S. Yorkshire
Allan Gill Offline

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Allan Gill  Offline

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Joined: May 2013
Posts: 5,004
Rotherham - S. Yorkshire
Unless you have a capacitor fitted into the charging system, (or 3 phase alternator followed by a few brisk kicks in succession) the bike won't start without a battery. An A10 or other magneto driven bike on the other hand doesn't need a battery to run.

Its quite possible that the alternator rotor is loosing magnetism, which is why its only registering a charge at higher rpms. If you remove the rotor, and rotate it 1 magnet at a time, it should hold its own weight off the exhaust pipe, its not a difinative test but should give you a fairly decent idea of whether the rotor is up to snuff.


beerchug
Re: 1970 a65 thunderbolt won't kick start with low bat [Re: Joshy] #751956
10/08/18 4:10 pm
10/08/18 4:10 pm
Joined: Sep 2004
Posts: 852
Farnham, Surrey, UK
gunner Online content
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gunner  Online Content
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Joined: Sep 2004
Posts: 852
Farnham, Surrey, UK
Sounds like the battery is not charging so check the charging system is working.

Even with a working charging system I don't think you would be able to start the bike if the battery was flat.

Some thinks to check:-
- what is the battery voltage with the engine running? Should be at least 12.5v and increase to around 13.5v with the engine revved
- Is an ammeter fitted? Check that its showing positive charge.
- test the alternator wires for short to earth. There should be no continuity from each lead to earth, if there is then your alternator is shot.
- what kind of rectifier/regulator do you have? The zenor type which typically sits between the forks can be unreliable.


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando

Moderated by  Allan Gill, Jon W. Whitley 


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