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1. 01:41 AM - Re: 912ULS - Rough start & Rough on one magnet (LAURENS yannick)
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| Subject: | Re: 912ULS - Rough start & Rough on one magnet |
First : change the battery; I had the same pb, and new battery
"odissey" solved the probl=E8m
Regards
yannick LAURENS
F PSCZ
Le 10 juil. 12 =E0 11:18, Sidsel & Svein Johnsen a =E9crit :
> 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 =93behavior=94,
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=92t 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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