The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: renos-a10 on 28.03. 2011 07:39

Title: Magneto problem?
Post by: renos-a10 on 28.03. 2011 07:39

Goodmorning all

I believe that i have problem with my magneto.So i need you light.
I make restore my BSA a10 from the begining ( engine - frame etc.)
I start the engine and all was find.I take a ride and i stop for relax.
The engine didn't start. I check the fuel and all was ok.
I charge the spark and that's it. But this problem is come again and again.
I believe that problem ..... magneto.What you believe?

Thanks in advance

Title: Re: Magneto problem?
Post by: MG on 28.03. 2011 08:48

Hi renos!

Sounds like a faulty condenser. Does it work again once the mag has cooled down?

The condenser is located inside the armature, so that has to come apart. Once you are at it, I would also have the armature rewound. Not cheap, but when done properly, it will last for ages.

Cheers, Markus

Title: Re: Magneto problem?
Post by: renos-a10 on 28.03. 2011 09:06

yes . it work again when cooled.
You believe that my mg need rebuild?
thanks

Title: Re: Magneto problem?
Post by: Pete Gray on 28.03. 2011 09:36

I had what sounds to be a similar problem on mine soon after it had been rebuilt.
It had run really well for a few miles then suddenly became erratic and wouldn't keep running.
I took the Mag back to the repairer (FTW in Sheffield) and on test they found that the head of the points securing screw was touching, or very close, to the cam ring causing a short. A replacement screw and the problem was solved.

Title: Re: Magneto problem?
Post by: lawnmowerman on 28.03. 2011 09:39

The mag is the heart of the engine and causes all sorts of obscure problems when playing up. It is not cheap to get a recon and rewind but the best money I have ever spent on my bike.
Make sure that you go to a reputable mag rebuilder.

Jim

Title: Re: Magneto problem?
Post by: renos-a10 on 28.03. 2011 09:56

Thanks all for you help.I think that my mag need rebuilt and i wiil make.
Thanks again :)

Title: Re: Magneto problem?
Post by: wilko on 28.03. 2011 19:47

In forty years of Brit bikes, i've only had one mag to break down in this manner. At the moment i've been running a 60 year old mag i bought for 40 dollars for 6,000 miles. They aren't as fragile, including the condensor as people insinuate. There are plenty of other reasons for this symptom.Other people are always ready to spend your money on an expensive mag rebuild.

Title: Re: Magneto problem?
Post by: Triton Thrasher on 28.03. 2011 21:15

Quote from: renos-a10 on 28.03. 2011 07:39

The engine didn't start.

I understand that.

Quote

I check the fuel and all was ok.

Did you try using the tickler button, even with a warm engine? Did fuel run out of the carburettor?

Quote

I charge the spark and that's it.

I do not know what that means and I would almost bet money nobody else does either.  Try to explain it differently.

Title: Re: Magneto problem?
Post by: kiwipom on 29.03. 2011 00:32

hi tt/guys,probably "changed the spark plugs" you get used to deciphering gobble de goop after a few forums,cheers,Bob

Title: Re: Magneto problem?
Post by: selva on 29.03. 2011 02:05

Hi Guys..
     i have faced same Problem before with my bsa a7.
Whn the engine cooled its easy to start.. but when stop riding,,,
and start again while the engine hot .The engine didn't start.
i got an advice from local old chef. he advice me  to change the condenser.
i ordered the condenser frm

 PETER SCOTT MOTORCYCLES
 44 RAVEL STREET, SEVEN HILLS2147
PH:96241262
EMAIL:[email protected].

after  change the condenser i have solve the problem.

the part number for condenser
400v-/220v-MP
40/070/56

hope this will help you  renos-a10
cheer steven

Title: Re: Magneto problem?
Post by: renos-a10 on 29.03. 2011 08:51

Good day guys...

I take out the mag and check it but evrything was ok.May be the problem is that one srew is too close.So i fix this and come back again

Thanks all for a moment

Title: Re: Magneto problem?
Post by: muskrat on 29.03. 2011 10:09

G'day Selva,
                 PS is the MAN down here for magies and dynamos. He was pretty quick on his Rudge as well.
Wilco, you lucky bugga, most magies have been WORKED on by ham fisted fools.
TT, I thought Renos was getting better. My Grandad was a Scott, couldn't understand a word he said  *smile*
Renos, which screw? Not the one holding the handle bars I hope  *smile*
Cheers

Title: Re: Magneto problem?
Post by: renos-a10 on 29.03. 2011 13:09

Sorry guys .... my english is bad.But i try to explain what happen with my baby.
TT  when i said '' check the fuel ''  ( i take out the carb , clean it , replace new gasket ...etc )
And when i said '' change spark ''  ( replace new spark plug )  beacause the spark plug was burn.
Now i hope you understand me.
Muskrat  the screw holding the ignition coil
Thanks anyway all for you help

Title: Re: Magneto problem?
Post by: selva on 30.03. 2011 02:07

           *smile*G'day. *smile*
 Guys..
 hope everthing fine
 *smile*
cheer
steven selva ;)

Title: Re: Magneto problem?
Post by: selva on 30.03. 2011 02:22

hi guys, *ex*
 its new replacement condenser for
magneto from PETER SCOTT MOTORCYCLES

400v-/220v-MP
40/070/56

cheer stevenselva *smile*