Author Topic: a7 not starting  (Read 911 times)

Offline baz123

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a7 not starting
« on: 11.02. 2017 19:10 »
hi everybody  I am new to the forum and looking for some help I've had a 1959 a7 ss  in the shed for a few years I have recently tried to get it running right it will only start if I take one of the HT leads off then it starts first kick on the cylinder that's still connected and the same if I do it on the other side but when both HT leads are on it coughs and back fires the timing seems ok ? any advice please.
regards Baz.
  59 A7SS

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Re: a7 not starting
« Reply #1 on: 11.02. 2017 20:32 »
G'day Baz  *welcome*.
I'm certainly no expert on magy's but my first thought is a dirtyslip ring or the camring is out of whack. Is it auto or manual advance? (an SS should be manual).
Cheers

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Offline baz123

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Re: a7 not starting
« Reply #2 on: 11.02. 2017 20:45 »
thanks for the reply  the shooting star has auto advance










thanks for the reply

the shooting star has auto advance . I checked the cam ring plus pick ups and bushes all look good.








  59 A7SS

Online beezermacc

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Re: a7 not starting
« Reply #3 on: 11.02. 2017 22:23 »
Even if the slip ring looks good I'm pretty sure this is dirty slip ring caused by poor quality brushes. Wrap some emery over the end of some rubber tube and push it through one of the pickup windows, turn the engine over slowly to clean the slip ring.
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Re: a7 not starting
« Reply #4 on: 12.02. 2017 06:25 »
Baz, when it comes to magy or electrickery beezermacc is your FRIEND.
Cheers
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Re: a7 not starting
« Reply #5 on: 12.02. 2017 09:45 »
Those symptoms are a dirty slip ring. 

Make sure you know which part is the slip ring before you clean it with cloth and petrol or alcohol.

And remove the points or earth the kill wire before turning the engine with your finger in the HT pickup hole.

Offline baz123

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Re: a7 not starting
« Reply #6 on: 12.02. 2017 09:49 »
thanks for the replies I will give the slip ring a good clean . will let you know how it goes.
cheers.
  59 A7SS

Offline baz123

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Re: a7 not starting
« Reply #7 on: 12.02. 2017 12:40 »
SORTED  took your advice and cleaned the slip ring and started first time I have noticed the bushes on the pickups are to soft so they are clogging the slip ring with carbon causing electric tracking . Will buy some new ones that are a bit harder.
thanks to everyone.
  59 A7SS

Online Bsareg

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Re: a7 not starting
« Reply #8 on: 12.02. 2017 13:00 »
There are lots of crap brushes on the market, much too soft, seem to coat the slip ring so spark goes to the easiest plug to spark
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Re: a7 not starting
« Reply #9 on: 12.02. 2017 13:05 »
I stock brushes which I know are OK. If you let me have your address by way of a PM I'll send you some for free!
Priory Magnetos Ltd - A10 spares, magneto and dynamo refurbs. www.priorymagnetos.co.uk

Offline baz123

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Re: a7 not starting
« Reply #10 on: 12.02. 2017 15:06 »
CHEERS BEEZERMACC
SENT YOU PM MUCH APPRECIATED.I OWE YOU ONE
  59 A7SS

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Re: a7 not starting
« Reply #11 on: 13.02. 2017 10:55 »
CHEERS BEEZERMACC
SENT YOU PM MUCH APPRECIATED.I OWE YOU ONE

Can't find your PM ! Just give me a ring or send an e-mail using the contact details on my website.  www.priorymagnetos.co.uk
Priory Magnetos Ltd - A10 spares, magneto and dynamo refurbs. www.priorymagnetos.co.uk

Offline baz123

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Re: a7 not starting
« Reply #12 on: 18.02. 2017 12:58 »
received the new brushes from beezermacc much better quality than the old ones .

Thanks BEEZERMACC.
  59 A7SS

Offline duTch

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Re: a7 not starting
« Reply #13 on: 18.02. 2017 20:52 »

 I had a similar experience on two occasions a couple of months ago when mine got wet, once when I washed it, and then when we were rained on. Took several goes at cleaning the slip-ring but now all back to normal- which is an intermittent miss at idle, been doing it for some time and not always but no big deal just annoying but probably a carby thing so won't get involved here.
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Offline edboy

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Re: a7 not starting
« Reply #14 on: 18.02. 2017 22:19 »
beezermack , are these new lucas contact brushs on ebay ok or some of the poor quality bunch. i ve had idle rougth running but runs perfect at top end speeds . i ve cleaned points etc but can t quite put my finger on cause .