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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Associated Magneto Questions


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  #1  
Old 10-01-2018, 07:29:56 PM
CBarth66 CBarth66 is offline
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Default Associated Magneto Questions

My magneto stopped making current to the igniter on my
1 3/4 hp. Associated, so I had the magnets recharged as they were weak. Both of them were marked where the south poles are. I need to know which way to install them on the magneto. Should there be some resistance when turning if the magnets are correct? It turns freely the way it is now. What kind of magneto is this? The pics show the south marked on the ends.
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Old 10-01-2018, 08:50:45 PM
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Steve Kreiner Steve Kreiner is offline
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Default Re: Associated magneto questions

Your souths should be on the same side
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Old 10-01-2018, 09:07:22 PM
CBarth66 CBarth66 is offline
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Default Re: Associated magneto questions

Should the souths be on the right or left hand side of the mag or does it matter? Also, I thought I read on some thread that these have to be somewhat timed to the igniter tripping?

Last edited by CBarth66; 10-01-2018 at 10:06:06 PM.
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Old 10-01-2018, 10:54:27 PM
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Default Re: Associated magneto questions

Doesn’t matter which side, but like poles need to be on the same side.
Once you have the magnets in the proper position, there will be resistance every 180 degrees of rotation. You want to time your magneto so that the ignitor points snap open just as this resistance is broken.
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Old 10-02-2018, 05:18:51 AM
CBarth66 CBarth66 is offline
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Default Re: Associated Magneto Questions

Thanks to both of you for the help. I will turn the magnets correctly and see if there is some resistance. Hopefully this will get some current produced. If this is good then I'll install my new rings that I bought at Portland this year, get a new gas tank made,put it all together and see what happens. I will report back about the magneto soon.
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Old 10-02-2018, 12:50:59 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Associated Magneto Questions

If you took the magnets off the magneto and charged them, you must charge as a pair, not individually. if the magnets are not charged together, they may take inequal charges, which will lead to them discharging each other as they try to equalize the charge. Also, when you charge, you MUST put a keeper on the magnets until you slip them onto the core. a magnet can lose up to 40% of its charge within a minute if a keeper is not used! As others have noted, both poles should be on the same side of the mag, otherwise the magnetic fields cancel and youget no power. Here is a simple test. Turn the mag and feel the resistance as the magnetic fields are broken. now - ground the power wire and repeat the test. The mag should have much increased resistance, almost to the point where the mag actually stops, when the magnetic field is cut. if resistance does not change, then you need to check the internal ground and brush to see if contact is being made. if the brush is good, then the coil is bad, and will have to be re-wound. if you have the magnets off, spin the rotor and see if it is contacting the armature. If it is, it may magnetize and render the mag useless unless it is de-magnetized. The rotor should spin freely, with the magnets off. Another test - place an AC volt meter on the mag. Set for 50 volt scale. Spin the mag with a drill and measure voltage. it should read 10volts or more. If lower than that, recharge magnets or if that does not help, the coil is bad
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Old 10-02-2018, 08:05:17 PM
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Default Re: Associated Magneto Questions

Thanks for all the good information Andrew. The magnets were taken off and charged as a pair and that's when the south poles were marked. I turned one magnet around to match the other magnets south pole, put it in the vice with some pieces of wood in between, spun it with my drill and the sparks flew off the temporary wire I had on the output terminal. I never was a magneto professional, so thanks again for your help guys!

Last edited by CBarth66; 10-03-2018 at 08:55:35 AM.
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