David
Yes that is exactly what it does. My engine started cold fine but would
not come up to idle speed. Ran as if only 2 cylinders were firing, very
rough with lots of vibration. It would take several attempts to get it
to run smooth. Once it had fired up once then it was ok for the rest of
the day. I believe it is the kick back that damages the sprag clutch
but the bad starting, going into what the Rotax dealer in the UK
describes as 'sub-idle' it the result.
Regards
Pete
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of David
DeFord
Subject: RE: Europa-List: bad cold starts
--> <davedeford@comcast.net>
> If it sounds like it is running on 2 cylinders then it could
> be sprag clutch. Have a look in the archive there is lots of
> stuff about this. I have just changed my sprag clutch after
> only 120 hours on a 912 ul. The problem was instantly cured.
>
> Pete
Can a sprag clutch problem cause rough running after the starter is off
(i.e., sprag clutch not disengaging)? I have been ignoring the sprag
clutch/heavy-duty starter discussion, assuming that it referred only to
kickback and other problems while the starter was actively driving the
engine (problems which we haven't experienced).
Thanks to all who have offered suggestions. We have carefully set the
clutch cables so that both chokes hit their limit stops at the same
time. We have also checked the temperatures of the exhaust pipes (both
by feeling and by EGT reading) after a few seconds of rough running, and
no significant difference was found between the port and starboard
sides.
Today we tried replacing the fuel in the float bowls with fresh auto
gas. No help.
After a few seconds of rough running, the port side carburetor sometimes
overflows fuel into the air box, probably because the float needle gets
shaken off of its seat. Cylinders 2 and 4 are then quickly flooded,
which can be overcome only by opening the throttle far too much. We'll
try starting with the fuel selector off, to see if we can avoid the
flooding.
Dave DeFord
N135TD
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