No two symptoms are alike, and I do not find what I am experiencing in the
Europa List archives:
- Cold start with choke, throttle idle: Instant ignition, VERY
rough running for one-two seconds, then smooth (see below, hwr).
- Warm start: No choke, some throttle: A little rough for one -
two seconds, then smooth (see below, hwr).
- Magnet check @ 4 000 rpm: rpm drops are well within limits, also
differential rpm drop (abt 50 rpm). Hwr, on magnet A it runs a little
rough, but not much. Smooth on B.
This happens every time I start up, exactly the same "behavior", so it is a
little difficult to imagine that a poor connection/broken wire strands in
the ignition circuit is the cause. One would in such case expect some
variation e.g. in the time it takes to get smooth running, wouldn't one?
I have replaced all the spark plugs. No improvement, neither re. starting
nor magnet check. The old plugs were all looking good, light greyish-brown
colour and no soot deposits.
I have checked that choke & throttle on both sides work in sync.
The service agent for Scandinavia suggest that this may not have a common
cause. He recommends the following:
- Install new battery, the 912ULS is a hard one to turn (about time
to do this, but I do not think this is the cause).
- Synchronize the carbs (the symptoms began only 4 hours flying
time after last synchronization). May cause the symptoms at mag.check, he
says.
- Check the ignition wires at the electronic boxes on top of engine
and to/on the plugs, with the engine idling.
Any other suggestions will be very much appreciated.
Regards,
Svein
LN-SKJ
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