mag test

by Leonardo Silva in 912 / 914 Technical Questions 7 years ago

Hello.....I'm Leonardo Silva live in Mexico got a 912 uls on a kitfox have not flown yet but started the engine, everything is ok, motor runs smooth, but on the mag test I get little drop on rpms on one side (200) and the other too much like 1000+, changed the plugs and still same drop, did everything by the book on the installation.
Checked the cables from the switch to the modules several times and they seem to be ok.
Will be nice to hear some input on this matter.
Thanks
Leonardo

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Re: mag test

by Rob Seaton » 7 years ago

Rob Seaton

3 1.32k 240

It may be your ignition switch, is it a rotary left-right-both type switch?
The can cause this type of problem.

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Re: mag test

by Leonardo Silva » 7 years ago

Leonardo Silva

1 4 0

Thanks Rob, will try to get another switch, seems odd on a bran new switch.

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Re: mag test

by Leonardo Silva » 7 years ago

Leonardo Silva

1 4 0

Thanks Rob, will try to get another switch, seems odd on a bran new switch.
, also I switched the cables on the ignition switch left to right and the drop also changes from left to right. Very strange situation.

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Re: mag test

by tom oatman » 7 years ago

tom oatman

5 28 0

Leonardo;
I had a very similar thing happen to my 912uls last summer. after much diagnosis, it was found to be a broken coil primary wire, inside the insulation (the 12v wire). my mechanic had the coil off (about to replace it) and discovered the break inside the insulation. the 12v wire is about 3-4" long, and there was a bulge of sorts.he was able to repair and get it back in service without any new parts.
perhaps Rotax has a has a flaw in their manufacturing methods or .......?.

just thought I would share this.
Tom O.

Thank you said by: Leonardo Silva

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Re: mag test

by Rob Seaton » 7 years ago

Rob Seaton

3 1.32k 240

If the problem did not stay with the switch then the switch is probably OK. It was good to eliminate it.
now swap the upper 6 pin connectors, except the ignition wires. De-pin them and keep them in with respective modules. If the problem moves you have now eliminated the secondary coils/spark plugs/grounds leaving the stator (red wire) and trigger coils.

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