Author Topic: Magneto issues?  (Read 3195 times)

Online BSA_54A10

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Re: Magneto issues?
« Reply #15 on: 25.03. 2013 12:30 »
I don't actually use mine for tuning unless I am in deep trouble or way out of my depth ( most of the time ).
What I use it mostly for is fault finding.
Really good particularly on late A65's with the carby balance tube.
No need to touch any of the owners "tuning" and I can show them where they went wrong ,
just about every one that has fronted up at my place was running both pots at idle off one carb
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Offline mayes

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Re: Magneto issues?
« Reply #16 on: 07.04. 2013 15:20 »
Hi Check that you are running on non resistance spark caps also I was caught out with the cut out switch not fully disconnecting witch gave a weaker spark when hot ,hope this helps Jon   
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Offline A10 JWO

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Re: Magneto issues?
« Reply #17 on: 07.04. 2013 16:04 »
Spot on Mayes, A bloke from Hullbridge gave me that good advice as well. Watch those cut off switches on the KF2 Mag'
: )

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Offline BSA500

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Re: Magneto issues?
« Reply #18 on: 07.04. 2013 19:16 »
I have disconnected the wire and will check it out tomorrow on the way to work.Fingers crossed.
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Offline BSA500

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Re: Magneto issues?
« Reply #19 on: 08.04. 2013 09:17 »
No change. Just to recap.... Fresh plugs and leads, no supressed plugs or caps(in fact no caps wired direct to plugs). The stutter is still there regardless of carb fitted. Ticks over and revs a treat just the stuttering when accelerating hard and gets worse the warmer the engine gets. It has a nice long run into work each day 13 miles each way. I would like to see if anything changes as the weather warms up but it seems that's still a way off *sad2*. I still intend to have the 1 inch carb resleeved and new needle jets etc when funds allow just to hopefully rule that out.
Could this be a condenser on its way out,if it is its taking a damm long time to fail. As an aside I had to fit B7ES plugs as the others(B6ES) failed as NGK seem to in under a year. It now pinks which is why I used B6ES.
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Offline muskrat

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Re: Magneto issues?
« Reply #20 on: 08.04. 2013 10:35 »
G'day BSA500. Retard the ignition a tad. A hotter plug won't help pinging, but it will help burn a richer mixture to combat pinging.
Is it a manual or auto advance?
Cheers
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Offline BSA500

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Re: Magneto issues?
« Reply #21 on: 08.04. 2013 12:28 »
Auto. Checked the weight action on the atu and that's fine will have a check on the timing when I have a chance to see if its not slipped or anything
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Offline a10gf

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Re: Magneto issues?
« Reply #22 on: 08.04. 2013 12:31 »
Maybe worth to try a Brightspark EasyCap, see http://www.a7a10.net/forum/index.php?topic=5359.0
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Offline BSA500

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Re: Magneto issues?
« Reply #23 on: 08.04. 2013 13:09 »
Don't really want to start cutting the mag about unless I am sure there is a issue
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Offline A10Boy

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Re: Magneto issues?
« Reply #24 on: 08.04. 2013 16:39 »
Thats a fair point, but it might just be the problem. Fitting a brightspark is easy, it will eliminate the dodgy condensor worry, and it will give you the reason to re-set your timing too. All for about 15 quid.  *smile*

No connection.
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Offline BSA500

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Re: Magneto issues?
« Reply #25 on: 09.04. 2013 12:24 »
That's  probably what I would end up with-no connection  *smile*. If it was the condenser, from previous experience, would it not be difficult to start, run rougher esp when hot. My only symptoms are the stutters under acceleration. She ticks over like a clock(better after fitting the spare carb),starts first/second kick even when hot and barring the stutters accelerates really well. There is no spit back but at the mo some pinking(timing?). I really must speak sweetly to she who holds the money about rebuilding the correct carb(1 inch not the current 15/16) and new needle/jet etc and going from there unless someone has any more possible reasons?
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Online Triton Thrasher

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Re: Magneto issues?
« Reply #26 on: 09.04. 2013 20:57 »
Missing under acceleration.

Can be a problem in the HT side of the ignition.  Close the plug gaps to about 8 thou. If that helps, well, at least you've eliminated the carburettor as the cause.
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Offline BSA500

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Re: Magneto issues?
« Reply #27 on: 10.04. 2013 08:40 »
Well it seems Triton Trasher wins todays prize. Closed the gaps and no stutter-hoorah. Of course this means there is an issue with the mag-boooo.
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Offline KenF

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Re: Magneto issues?
« Reply #28 on: 10.04. 2013 17:14 »
Well done, TT.

BSA500, if you're after a mag troubleshooting guide, please pay a visit here http://brightsparkmagnetos.com/DIY.

You may have a condenser problem, but I guess it's more likely to be a breakdown of the insulation around the HT winding or of the slip-ring or pick-up. Sometimes you can detect a pick-up problem by putting your hand on it while the engine's running (but don't try that if you've got a pacemaker). Breakdowns of the winding insulation or slip ring are more difficult to detect without stripping the thing down completely and using a magneto coil tester.

Best of luck.

Ken
http://brightsparkmagnetos.com
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Online Triton Thrasher

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Re: Magneto issues?
« Reply #29 on: 10.04. 2013 17:54 »
Well it seems Triton Trasher wins todays prize. Closed the gaps and no stutter-hoorah. Of course this means there is an issue with the mag-boooo.

I suppose you've eliminated the cheap possibilities like bad plugs, cracked pickups, HT lead or plug insulators tracking, buildup of oily stuff on pickups?
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