Is it possible that the engine was run hard, and one cylinder got hotter
than the other (due to carbon buildup, etc)?
In the troublehooting section for the 914 Rotax manual, it states that a
hot engine which has not been allowed to cool down could do this, even with
the ignition turned off. It advises to idle at 2000 RPM before shutting
down.
Just a pre-initial stab at it.. Due to the RPM's not dropping from one set
of plugs, this may not be it.
More than likely, it is the old open grounding wire problem, which old
magneto-types can have.
Looking at the schematic for the 914, shows a 'breakerless capacitor
discharge' design. It also shows a grounding wire from the module, through a
switch. If the engine was not put away overly hot, I would start there.
Verify with an ohm meter, or a volt meter (or both) that the ground wire
---From the module, does in fact get grounded through the switch.
Greg Fuchs
A050 XS Tri 914 Intend Fit
Tigard (Portland) Oregon
_____
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Richard Schultz
Sent: Friday, April 06, 2007 8:49 PM
Subject: Europa-List: HELP my Rotax Won't Stop!
Has anyone had problems with a 914 that won't shut down? On a flight today
everything started out fine until the first stop, On turning the switch to
off the engine kept running, shutting the master off did not help either.
The engine just continued to run. Turning off the fuel switch solved the
problem. Restarting the engine showed no drop in RPM from one set of plugs.
The flight home was uneventful but again the engine would not drop RPM's
---From one set of plugs (closest to the off position?) and had to have the
fuel cut off the kill the engine. I have not done any trouble shooting yet
but hope to get back out to the airport tomorrow (Saturday) or early next
week to see what has opened up in the system.
Anyone have ideas at this early point?
One thing about a Rotax they want to keep flying. I guess the plane just was
not ready to stop having fun today! :-)
Rich Schultz
N262AE
713-703-2156
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