clive f
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Posts: 4
Hykeham, Lincoln, UK
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« on: 23.07. 2011 18:53 » |
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Hi everyone I have now successfully put together my forks and the A7 has now got an mot, however there is a problem, the bike is an easy starter when it is cold but the longer you ride it the less it wants to idle and if the motor stops it is a pig to start. I am thinking it is a carb problem.
Any thoughts out there?
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1948 BSA A7 (Rigid)
1962 BSA C15 Star
1958 BSA A7 (swingarm)
1978 Honda CD175
2004 Triumph Bonneville T100
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A10Boy
Forum Oracle
Karma: 7
Posts: 884
Solihull, Near Birmingham England.
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« Reply #1 on: 23.07. 2011 19:04 » |
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Yes, either too rich or the mag is faulty. They can fail when hot, the windings break down or the condenser packs up. The problem is, that if you take a plug out to check the spark, it can spark because its not under compression. Try closing the gaps next time it happens. Do the plugs look like its running rich?
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Regards Andy 1960 A10 - Black Golden Flash 1973 Z1a - Fast 1960 AJS Model 31 CSR - Beauty  |
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muskrat
Forum Oracle
Karma: 25
Posts: 1880
Lake Conjola NSW Oz
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« Reply #2 on: 23.07. 2011 22:51 » |
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G'day Clive,
most home tuners (and some shop ones) don't bring the bike up to full operating temp before adjusting the pilot and idle. It should take a good 10 minute ride before setting them. So if you can get that part right and it plays up later it points towards the mag as Andy suggests.
Cheers
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Only young once, immature forever. Now how can I make this go faster. '51 A7 plunger, '57 A7SS now A10, '71 A65 Lightning (gone to god) '76 XT500, '83 CB1100F, next project a '64 A65.  |
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Goldy
Warwickshire, England
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Posts: 455
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« Reply #3 on: 23.07. 2011 23:20 » |
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Have you got a thick insulating gasket between the carb and the head, because if not heat can be transferred to the carb body and cause the type of problems that you refer to.
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56 A10 Golden Flash - Restore, ride, relive.
56 C12 BSA project ongoing
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clive f
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Posts: 4
Hykeham, Lincoln, UK
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« Reply #4 on: 23.07. 2011 23:27 » |
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Cheers guys this is good, I now hav lots to check and tryout to get the bike running right.
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1948 BSA A7 (Rigid)
1962 BSA C15 Star
1958 BSA A7 (swingarm)
1978 Honda CD175
2004 Triumph Bonneville T100
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robroy
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« Reply #5 on: 22.01. 2012 14:39 » |
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Hi Clive
Did you get to the bottom of this?
My A10 displays identical symptoms very frustrating, mine also feels like it loses power as it warms up
Cheers
Rob
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renos-a10
A's best friend
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Posts: 117
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« Reply #6 on: 22.01. 2012 18:46 » |
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G'day all
My opinion is magneto.My A10 had the same problem and i send in england for recondition.The problem solved.
Cheers
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1960 BSA A10 Swinging Arm
1955 Matchless G3LS
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beezermacc
A's best friend
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Posts: 182
Not for the purist!
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« Reply #7 on: 22.01. 2012 19:36 » |
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Robroy - I've sent you a PM - hope this helps.
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'The Magneto Man'
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jfligg
A's best friend
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« Reply #8 on: 22.01. 2012 23:49 » |
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Hey Have you checked to see what your not getting when its hot? Are you loosing spark? What do the plugs look like? Have a look at the points on the left side of the mag. Good Luck Jeff
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Felters
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« Reply #9 on: 15.02. 2012 22:04 » |
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Somebody a lot smarter than me once said that 80% of all carb problems are electrical. I'd bet you £5 to a bag of conkers that the mag is knackered.
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'59 BSA A7 and '02 BMW 1150RT
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wilko
A-Clairvoyant
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Posts: 315
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« Reply #10 on: 15.02. 2012 22:12 » |
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Somebody also said most mag problems are carby faults! Hope that helps??
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