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912 Rough running on either left or right mag -- smooth,on

 
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hdwysong(at)gmail.com
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PostPosted: Mon Jun 05, 2006 12:37 pm    Post subject: 912 Rough running on either left or right mag -- smooth,on Reply with quote

Hello Jon -

We experienced large ign drops (> 650 RPM) and EGT problems
on our 914. Turns out our mixture (as delivered from the
factory) was too lean. After setting both carb needles one
notch richer everything operated within spec.

We're hot/humid down here (Texas), and the Rotax expert we
talked to mentioned that the nominal carb needle (mixture)
settings would need to be set per the prevailing weather in
your location. Perhaps you're teetering on the edge between
one mixture setting and another?

Note that the Rotax purists will probably scold you (using
an Austrian accent!) for saying left or right. We have a
top (A) and a bottom (B) ignition module... regardless of
what the key switch says. Wink

D

------------
Quote:
Time: 07:49:53 PM PST US
From: "Jon Croke" <jon(at)joncroke.com>
Subject: 912 Rough running on either left or right mag -- smooth
on both



Would anyone have an idea on the following problem:

I get about a 400 rpm drop and a definite roughness (like a cylinder
missing) when performing a mag check... identical reaction for left AND
right... but when using both mags the engine seems to run just fine and run
smooth... I still get full power and have been flying... but this behavior
conerns me... didnt use to be this way... Rotax manual calls for a max 300
rpm drop..

Using a 80hp 912

Thanks for any suggestions...


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