Replies to This Discussion

Permalink Reply by John Austin on July 4, 2020 at 2:33pm

Support and all parts should be available from the US Jabiru distributor, Arion Aircraft : www.flylightning.net.

John

N750A

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Permalink Reply by Eugene Stone-Romero on July 4, 2020 at 2:35pm

Thanks John. I will contact them on Monday!

Best regards,

Gene

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Permalink Reply by Don Burkholder on July 5, 2020 at 8:28am

Don't know if this would help but did you check and set the clearances of the magnets and the coils? This would be a good place to start and it's easy to do.. I bought some brass shimstock that measures .010 and cut out strips large enough to place between the coil and magnets. Clean any rust off of the flywheel magnets gently. Turn the prop to align coil and magnets up, insert the shimstock, loosen the coil screws and the magnet will pull things together, tighten screws then remove the shimstock. You may find it difficult to remove the brass shimstock if there was any rust not cleaned prior. You might need to rotate the prop a little to remove the shimstock but now you know you have the minimum clearances called for by Jabiru..

  As far as my memory of checking coils for the proper resistances OHMs, they are given in the Jabiru engine manual. 

Another thought is if the weak side occurs when engine is hot vs being fine at cold start up. This would indicate a coil issue. Check your distributor caps and rotors for pitting and burning. Aluminum is used for the contacts in the caps. This burns away quickly. On my 2200 Jabiru I found and installed a distributor caps and rotors that had brass contacts from an automotive application that I purchased from a local NAPA store. Even used suppression core wires and NGK Iridium spark plugs. These plug lasted a long time.

All modifications with good results as I could idle it down to 300 to 400 rpm and you could not feel any vibration and was very quiet.

So, in summation. It could be a defective coil or output wire, coil clearances to magnet, pitted distributor caps creating excessive cap to rotor clearances. I eventually sold my plane, but I loved to work on and improve the Jabiru engine...

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Permalink Reply by John Austin on July 5, 2020 at 8:35am

Don's advice is spot-on!  Also be sure that you have cooling air diverted to the coils.  You need ducts about 1/2" min. i.d. coming off the ram-air ducts and aimed at the coils - it's covered in the FWF installation manuals that I "think" are still available on-line, as are the factory Jabiru maintenance manuals.

In the above pic you can see the white PVC duct coming off the ram-air duct.

John

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Permalink Reply by Eugene Stone-Romero on July 5, 2020 at 11:37am

Dear John:

Thanks again. I will check the Jabiru manual for the proper clearance.

Best regards,

Gene

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Permalink Reply by Dan Dempsey on September 12, 2022 at 10:15pm

So what was the issue?  I'm having the same problem.

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Permalink Reply by Eugene Stone-Romero on July 5, 2020 at 11:35am

Dear Don:

Thanks for your recommendation, it's much appreciated. . I will give it a try before doing anything else.

Best regards,

Gene

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