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#252777 - 05/09/09 7:18 pm A65T suddenly dies  
Joined: Nov 2005
Posts: 34
GJ Offline
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GJ  Offline
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Holland
Hello all, do need some help here:

My A65T with Boyer ignition does have a new habit: starting after two kicks (like always), runs great (like always) and than after driving a couple of kilometers ( or miles ) sudenly dies without any reason. I than try to start the bike immediately but no way: it looks like the ignition has been turned off. After a few minutes it runs great again, like nothing has happened. During the ride there aren't any other signs of problems at all. This happens sometimes after 1 km, sometimes after 50 km and sometimes not at all!
I've checked the complete wiring etc., replaced the pick-up plate by a new one but no result.

Any idea's?

Gert-Jan


BSA A65T '68
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#252781 - 05/09/09 7:41 pm Re: A65T suddenly dies [Re: GJ]  
Joined: Sep 2005
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Ger B Offline
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NL
Hallo Gert-Jan, hoe gaat ie?

These are the worst problems, the "sometimes yes sometimes no" issues. Did you ever try the batpac thing you posted about some time ago? If yes; could that have done some damage to your Boyer?
I'd suggest to follow the complete system, small screws, plug connectors, but you say you have allready done that...
Can you isolate the ignition system from the rest of the wiring and run the ignition as "stand alone"?


Ger B

#252790 - 05/09/09 8:20 pm Re: A65T suddenly dies [Re: Ger B]  
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DMadigan Offline
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ca, us
Sounds like the usual problem, your fuel tank vent is blocked. If you took along a second plug and hooked it up when it "died", laid it against the cylinder and kicked, it would probably spark just fine. Of course you could flip open the fuel cap momentarily when it "dies" to see if it starts running again.

#252801 - 05/09/09 9:27 pm Re: A65T suddenly dies [Re: DMadigan]  
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MarcB Offline
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Chelmsford MA
What about a bad coil, maybe gets hot and shorts itself out internally?

#252811 - 05/09/09 10:27 pm Re: A65T suddenly dies [Re: MarcB]  
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Mark Z Online content
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Mark Z  Online Content
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Owego, NY, USA
Look for a wire in the ignition circuit that is partially broken inside the insulation. Usually you can feel a "limp" spot in the wire. The jumper wire between the two coils is the primary suspect (and the easiest to replace out of hand).

When a wire is hanging on by only one or two strands, it may conduct when cold, but then it will heat up just from the current passing through the one or two strands, and virtually cease to conduct.

Also check for any wires loose in their terminals. Do a "tug test" on each terminal and watch for movement between terminal and wire. A loose crimp can be maddeningly intermittant.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
#252833 - 05/10/09 1:42 am Re: A65T suddenly dies [Re: Mark Z]  
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cycarmark Offline
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florida
My 1970 A65T had a similar problem, but much more consistent. It would stop running like the ignition was turned off after a few minutes of running and then restart after a short while and be fine the rest of the day. I went through the testing of the wiring harness, checking all connections, adding extra ground wires, checking the battery, but what solved the problem was to replace the Boyer black box. It immediately solved the problem. Replacing the black box is not one of the first things to do as it is expensive, but if all other things do not do the trick, the box itself could be at fault.

#252870 - 05/10/09 10:48 am Re: A65T suddenly dies [Re: cycarmark]  
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nisse Offline
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sweden
Iīm also going for the vent in the fuelcap

I have a similar problem om my 650 -71 but I have two carburettors so sometimes after a couple of miles one cylinder begins to shut down and then itīs just to open the cap and it runs again. Iīve cleaned out the venthole and made it bigger but i doesnīt help so itīs about to be changed

good luck finding the problem

#252974 - 05/10/09 10:27 pm Re: A65T suddenly dies [Re: nisse]  
Joined: May 2004
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BSA_WM20 Online content
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Sydney Australia
Gert,
For a start make some jumper leads, one to go from the battery to the Boyer bypasses the ignition switch). one to earth out the coils and one to bridge the two coils. And I said make as in put some terminals or alligator clips on the ends. Then off for your usual test ride,with only 1/2 tank of fuel and the cap not fully tightened down. If the bike stops, try each of the jumper wires in turn. If it dosn't then repair or replace the cap.
If none of these work then have a good look at the coils.
You should be able to get a double ended one from an old Japaneese bike that has removeable high tension leads. Put some terminals on the wires so that you can quickly slip it in and try your test ride again.
If that makes no difference then there are only 2 things left the trigger & it's wireing or the black box itself.

Having been a member of the BSAMCC of NSW for nigh on 30 years I can defineatly state that 99.99% of these problems have been a bad connection to the Boyer and shamefully it is usually one of the termnals that was attatched at the factory.
Boyer get no sympathy from me by useing those absolute crap insulated crimp terminals that are 100% totally unsuitable for use on a motorcycle and for that alone they deserve to go bankrupt. I can never understand why an extremely good & reliable product can be made so unreliable for the sake of a 2p connector.


Bike Beesa
Trevor
#253197 - 05/11/09 7:32 pm Re: A65T suddenly dies [Re: BSA_WM20]  
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GJ Offline
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Holland
Hoi Ger, dat is lang geleden! Long time no see! Hij gaat goed dank je.

All, thanks for the replys; I now have something to go for.
I'll start with the fuel cap, which is the cheapest option...

The coil i use is a Honda type with double end, it is only one year old so i don't think this is a bad one but you never know. Also easy to have a look at this one.

I forgot to mention in my first post that when the bike stops i immediately did remove the sparkplugs to check if there was a spark: only after a couple of minutes the spark was back: maybe indeed a bad coil?

I will also have a look at the boyers connections.

All, thanks again. I'll let you know about the results.

Rgds, Gert-Jan


BSA A65T '68
#253200 - 05/11/09 7:48 pm Re: A65T suddenly dies [Re: GJ]  
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nisse Offline
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sweden
my question is :is the coil compatible with the Boyer? current.resistance and so on

#253233 - 05/11/09 9:48 pm Re: A65T suddenly dies [Re: GJ]  
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MikeA65F Offline
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Aberdeen MD
Not sure what year bike you have, but my 70 Firebird was acting the same way. Getting plenty of spark so it had to be gas. The concentrics have a filter at the banjo connection. The left side was filthy so I cleaned both and the bike has not acted up since.
Good Luck

#258212 - 06/09/09 6:01 pm Re: A65T suddenly dies [Re: nisse]  
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GJ Offline
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Holland
What about a bad rotor (dynamo)? Does this have an imm. effect on the Boyer even if your battery is fully loaded? I've replaced the ampere-meter: it also looks like it is not loading the system very well (low output).


BSA A65T '68
#258384 - 06/10/09 12:34 pm Re: A65T suddenly dies [Re: GJ]  
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penna-john Offline
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duncannon penna
make sure your ac charging wires arent in the vicinity of your ignition wires, that can make interference

#258395 - 06/10/09 2:05 pm Re: A65T suddenly dies [Re: penna-john]  
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Valk Offline
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Valk  Offline
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Bethesda, MD
My '66 Tbolt did the same - pooped out every time after 10 miles, then would fire right up after an hour or 2 rest. I also have a Boyer.

Turned out that my Dyna coil was mounted such that one of the terminals was too close to a frame member and was jumping the gap and shorting out. After a while, the coil would reset and the bike would fire right up until it did it again.

Sounds kinda like you...

Peter


'56 Road Rocket
'66 Lightningbolt
'98 Valk
#271202 - 08/20/09 5:54 pm Re: A65T suddenly dies [Re: Valk]  
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GJ Offline
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GJ  Offline
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Holland
Well, finally it looks like i have found the problem: i fitted an other (used) coil and since then i have done approx. 70 km's without any problem! Life can be so nice on a BSA...
Future will tell more.

Anyway, thanks again for the help.

Rgds, Gert-Jan


BSA A65T '68
#271234 - 08/20/09 8:35 pm Re: A65T suddenly dies [Re: GJ]  
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Ger B Offline
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Goedgedaanjoggie! beerchug


Ger B


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