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Old 05-07-18, 09:07 AM   #1
Mister_D_Lister
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Default Wico A - "sparklets"

My Stuart R3 has a Wico A fitted. I thought this was delivering a good spark until I looked closer. The spark is not a single flash but several "sparklets" at different points along the electrode, so I'm wondering if this is the cause of the R3 not starting - there is a little white vapour in the exhaust so it's trying to ignite.

I've ordered a bog standard ignition condenser to try - about the same size as the metal can one fitted now. Does this sound like I'm on the right track to restore a single fat spark?

Paul..
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Old 05-07-18, 09:43 AM   #2
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Sparking around the electrode sounds like the plug is dirty....electric will take the path of least resistance.....
Try cleaning the plug or swapping for a new one first....

That would be my course of action...
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Old 05-07-18, 09:57 AM   #3
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Quote:
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Sparking around the electrode sounds like the plug is dirty....electric will take the path of least resistance.....
Try cleaning the plug or swapping for a new one first....

That would be my course of action...
It happens with a brand new plug as well - I've tried several different plugs all with the same result. I've made sure the mag is properly earthed to the engine, gaps are ok etc. so other than the HT side of the coil failing a leaky condenser is the only thing I can think of. I would think the spark just isn't hot enough under compression to fire the charge.
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Old 05-07-18, 10:12 AM   #4
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Have you tried rubbing pencil lead on the electrode? that can make quite a difference.

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Old 05-07-18, 10:22 AM   #5
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What about the ht cap or the lead? Tried swapping them?
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Old 05-07-18, 10:38 AM   #6
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Has it got a "cap" on the HT lead or a brass terminal? There's a suggestion that the "suppressor" type cap isn't good with a magneto, more so if it is less than 100%

Googling "suppressor caps and magnetos" brings up a lot of articles on this subject.
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Old 05-07-18, 01:05 PM   #7
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I've replaced the HT lead & gone back to bare wire at both ends. Pencil has made no difference either. I'd be happier if I had a starting handle rather than the rope start - at least I could crank at a consistent speed. However, I don't have one so I guess it's wait for the postman bring me a new condenser & see if I'm right.

Paul.
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Old 05-07-18, 01:32 PM   #8
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It would probably be harder to start to start on a handle. OK for checking spark but we ditched the handle on the WX11 for rope start, much easier...
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Old 05-07-18, 02:08 PM   #9
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It would probably be harder to start to start on a handle. OK for checking spark but we ditched the handle on the WX11 for rope start, much easier...
Well if you want to rehome the handle...

Paul.
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Old 05-07-18, 02:58 PM   #10
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Quote:
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Well if you want to rehome the handle...

Paul.
Off to Internal Fire with the Stuart H1.
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