912 excessive RPM drop on lane A

Robert Ovenstone wrote:

Does switching the ignition electrics at the 6pin connector and the 400 drop doesn’t change reaffirm that mag A is not stuck?

Swapping the 6-pin connectors will swap the trigger coils, Charging coils, and the ignition switches.

A will become B.  A<-->B

The problem should switch sides and the B Ign should then show the 400rpm drop.

Are you saying you tried this and it DID NOT Switch sides??? 

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And just to avoid any more confusion... You have an Off-On-Start Key switch and two separate Ignition switches A and B!  Is this Correct???

After starting, you can turn the Start Switch OFF and Pull the Key and the engine continues to operate.   Is this Correct???

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Attention ADMIN !!!

Please inform the Rotax documentation department that In the 912/914 Heavy Maintenance Manual, Figures 74-20 and 74-22: Items 9, 15 and 16; Connectors, Plugs, and Coils, are Mis-Numbered.

Yes off-on-start key switch and two separate toggles for A.   B.  Mags

turn off key engine will not quit until A.  B.  toggle switches are off

Switch 6 pin connector and rpm drop does not change mags

Just to be 100% clear here. (and 75% Anal. ), When you say that switching the 6 pin connectors does NOT switch mags; what you are saying is that the rpm drop is still associated with toggling the "B" Mag OFF???  and not that the drop remains connected to the "A" ignition electronics that are now connected to the "B" Mag Switch.

Normal Wiring; "B" Mag Switch OFF;  400rpm Drop.

After the 6 pin Connectors Swap...

"A" Mag Switch OFF;  400rpm Drop.   <---<<< Pick One!

"B" Mag Switch OFF;  400rpm Drop. 

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Also, just for confirmation, your Electric Modules have ONLY TWO 6-Pn Connectors Each,

and NO 4-pin or 1-pin connections.

Paul,

Your question about the AirBox Sensors being a common failure item and common to Both ECUs (Lanes) has been deleted along with my reply which went something like this...

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There is a service bulletin concerning the connectors pulling Off of the sensors on the Airbox.

Rotax has made an optional locking clip available to mitigate the problem.

Be sure the connectors are fully inserted and the locking bail is seated.

Removing the first Ty-Wrap upstream of the connectors in the harness will produce the necessary slack needed.

Replace the cut Ty-Wrap but leave the cable to the sensor out of the bundle.

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The Airbox has 4 sensor mounted on it.

One Air Temp and One MAP sensor feeds the Lane "A" ECU.

One Air Temp and One MAP sensor feeds the Lane "B" ECU.

The sensors are Not common to the ECUs (Lanes)