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Permalink Reply by Don Burkholder on June 28, 2018 at 5:06am

Hi There are a few things to check before buying another mag. Use an OHM Meter to check resistances from the spark plug end of coil wire to engine ground, then remove grounding wire from coil check from ground wire connection to ground. Then, grounding tab to end of spark plug wire.. Also check  wire back to switch should show "open". Use a piece of brass shim stock, .010" thick to set the coil pick up to flywheel gap, clean any rust off before setting gap.. Check inside of cap and rotor for loose brass, corrosion, or just replace. All these specs should be found on Jabiru Austrailia web site..     https://jabiru.net.au/service/manuals/..     

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Permalink Reply by jamie ball on June 28, 2018 at 9:57am

Thank you for the advice I will try this and hopefully it resolves the issue

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Permalink Reply by John Austin on June 30, 2018 at 8:03am

Jamie,

The mags can suffer from overheating - do you have cooling blast tubes installed?

John

N750A

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Permalink Reply by David Gallagher on July 5, 2018 at 7:03am

Jamie,

Did you make sure all of the plug wires were pushed into the distributor cap?  I had a big mag drop once noted on my Dynon EMS that a plug seemed colder than the rest.  Upon removal of the cowl, all I could find was what seemed like a plug wire not well seated in the cap.  I gave them all a good push and have not seen the same problem since.  Every time I have the cowl off, I give all the wires a good seating push into the cap.

Dave 

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Permalink Reply by Joe Donohue on August 14, 2020 at 9:50pm

I just had this problem, it was a bad spark plug cable. I started with new plugs and then did a resistance check on each plug cable. I replaced the cable and mag check is back to normal. I decided to go ahead and order a complete set from Aeron, $145.

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