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Post by richardjon on Jul 20, 2020 7:29:35 GMT 1
May have been asked hundreds of times before. Do I need battery power to creat the spark it’s very weak
Cheers.
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Post by graeme6 on Jul 20, 2020 20:01:41 GMT 1
No
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Dave B
Drag-strip hero
Posts: 240 
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Post by Dave B on Jul 21, 2020 10:31:58 GMT 1
Well, not really, but there are problems if the battery has failed in some interesting ways. If the charge coils or the battery are creating, and the battery is drawing, a lot of current, the 'back EMF' from that can distort the magnetic field of the flywheel, so that the peak magnetic force does not pass the ignition coils at the right time. That makes for a weak spark. Even though the system is self energising, battery problems can effect it.
"Back EMF" is not quite the right phrase. What it means is that when the movement of a magnetic field close to a coil generates a current in the coil, the coil itself then becomes an electro-magnet, whose magnetic field opposes the magnetic field that created it.
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Post by museumman on Aug 17, 2020 19:05:10 GMT 1
You can improve the quality of spark if your plug cap looks mint but can be faulty or dirty inside.
If you're unsure when it was last replaced, do it anyway it for around a fiver and always snip a few mil off the wire for a fresh join.
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