Rotax 912 running ruff during mag drop....?

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Rotax 912 running ruff during mag drop....?

Postby martyntaylor » Sat Jun 02, 2018 6:35 pm

Hello people

I have a rans s6 at little gransden near Cambridge which runs ruff during a mag drop which leads me to think I have an ignition problem on one of the spark plug. Which could be the ignition packs or the coils.

How do I go about getting this diagnosed and repaired


Thanks martyn

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Re: Rotax 912 running ruff during mag drop....?

Postby Leesr » Sat Jun 02, 2018 8:35 pm

Dough sparking plug? Cheap and easy to eliminate. Then move on to other sources if that doesn't fix it.
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Re: Rotax 912 running ruff during mag drop....?

Postby John Price » Sun Jun 03, 2018 9:33 am

Then try the spark plug cap, then the HT lead connections at either end. Sometimes they work loose.

Then go for carb balance and idle.

These are all easy to do prior to getting on to the complex stuff.

John.
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Re: Rotax 912 running ruff during mag drop....?

Postby Kevin Dilks » Thu Jun 14, 2018 12:36 pm

At what RPM are you doing the mag check ?

If at 4000 then , like some has said go for a plug but more like a plug cap as the resistor inside cracks, test by removing the cap and checking with a meter anything over 5.2K ohm and its a bin job.

cheers
Kevin
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