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troubleshooting ignition system on 912 series engines

  • GlenN199LL
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2 years 1 month ago #15452 by GlenN199LL
Trouble shooting igniton system fot 912's. From the stator to the modules to the spark plugs.

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2 years 1 month ago #15454 by Roger Lee
Look in the Heavy Maint. manual. It has the specs for ohming out the pin connections. It doesn't sound like an ignition module. before you begin you may want to unscrew each spark plug cap and trim back each plug wire 3/8" and when you go to screw it back on place a dab of dielectric grease on the tip of each wire.
Replace the spark plugs whether you think they are good or not.

These two items could be your problem, but may not be, but you have to start at ground zero and work back. I don't think this is from the stator end.


leave no stone unturned for that will be the one that is the problem.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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  • robertkennedy1088
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2 years 1 month ago #15542 by robertkennedy1088
Replied by robertkennedy1088 on topic troubleshooting ignition system on 912 series engines
I have a 912uls engine with a soft start module added 2010. engine won't start can a bad soft start module be a cause. Is there some advantage to a soft start module?

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2 months 1 week ago #21777 by Russty30
Hi guys, In my serch i found that there is no 12v to the soft start module, my Question is, where does it come from, the starter switch or starter relay. Russty30.

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2 months 1 week ago #21778 by Roger Lee
There is supposed to be a wire from each soft start module that goes to the starter solenoid center connection. When you turn the key it sends 12v to each module to initiate each soft start. If you don't have those connected then no soft start. There is an open pin hole on each module connector for this. The new modules have a wire already installed ready to hook up. The older sets you had to install the wire.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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