Today's Message Index:
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1. 08:49 AM - Re: Re: 912 rough running below 3000 rpm (Flynn Elliott)
2. 09:34 AM - Re: Re: 912 rough running below 3000 rpm (Guy Buchanan)
3. 10:10 AM - Re: Re: 912 rough running below 3000 rpm (Flynn Elliott)
4. 04:48 PM - Re: 912 rough running below 3000 rpm (Roger Lee)
Message 1
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| Subject: | Re: 912 rough running below 3000 rpm |
Latest update,
Idle jets cleaned, copper wire passed through although nothing appeared in
terms of crud, ran motor seemed better, closed throttle for landing and we
were back to rough running.
This morning pulled idle jets again, able to see through one but not the
other. Cleaned the hell out of it over a white cloth yet no crud seemed to
appear although I can now clearly see through it.
Motor now idles at 1800 rpm reasonably well yet appears to be hunting
slightly whether on left mag, right mag, or both, mag drop 50rpm both.
All cables smooth and returning to stops.
Fuel lines flushed.
Fresh fuel.
Fresh filter
New plugs.
Maybe I am looking for a smooth smooth 912 idle that doesn't exist, we don't
have another at the field to compare.
It has been suggested that ignition packs are at fault although that seems
highly unlikely as the motor starts on the click and cruises super smooth.
Many thanks to all for help and suggestions.
Flynn
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee
Sent: 25 May 2015 12:55 AM
Subject: RotaxEngines-List: Re: 912 rough running below 3000 rpm
Blow the carbs out with carb cleaner and then follow it with air pressure
air. Don't blow against the diaphragm with high pressure air.
--------
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442543#442543
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Checked by AVG - www.avg.com
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No virus found in this message.
Checked by AVG - www.avg.com
Message 2
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| Subject: | Re: 912 rough running below 3000 rpm |
Saw this kind of thing once on an aircraft that sat a while with auto
fuel in the tanks. The evaporating fuel left some residue which then
re-liquified somewhat in the new fuel and wreaked havoc on the fuel
system. Problem was the evidence was very hard to see and the effects
very subtle, as the residue basically "plated" the entire fuel system
with a very light coating of sludge, which would, after some hours,
always lead to either a fuel filter clogging, or a jet clogging, or
something similar. The only solution was to put a Facet fuel pump on the
tank exit line and re-circulate fuel through the tank for days on end,
replenishing the fuel occasionally, to clean out the tank sludge. I hope
this isn't your problem but I thought I'd put it out there.
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 912-S / Warp 3cs / 500 hrs. and grounded
Now a glider pilot, too.
Message 3
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| Subject: | Re: 912 rough running below 3000 rpm |
Thanks for that Guy, if I don't solve this by other means then fortunately
the wing tanks can come out.
Flynn
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Guy
Buchanan
Sent: 02 June 2015 06:34 PM
Subject: Re: RotaxEngines-List: Re: 912 rough running below 3000 rpm
--> <gebuchanan@cox.net>
Saw this kind of thing once on an aircraft that sat a while with auto fuel
in the tanks. The evaporating fuel left some residue which then re-liquified
somewhat in the new fuel and wreaked havoc on the fuel system. Problem was
the evidence was very hard to see and the effects very subtle, as the
residue basically "plated" the entire fuel system with a very light coating
of sludge, which would, after some hours, always lead to either a fuel
filter clogging, or a jet clogging, or something similar. The only solution
was to put a Facet fuel pump on the tank exit line and re-circulate fuel
through the tank for days on end, replenishing the fuel occasionally, to
clean out the tank sludge. I hope this isn't your problem but I thought I'd
put it out there.
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 912-S / Warp 3cs / 500 hrs. and grounded Now a glider
pilot, too.
-----
No virus found in this message.
Checked by AVG - www.avg.com
Message 4
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| Subject: | Re: 912 rough running below 3000 rpm |
Hi Flynn,
This isn't the ignition modules, wrong symptoms. This is either fuel or the gearbox.
The carbs are clean and nothing is in the mixture jet (corner of the float
bowl) or the idle jet? I take it the idle is in sync and it isn't set too
low an rpm? If the gearbox is a little on the loose side it could need a re-shim.
This can be intermittent due to load changes when there is an rpm change.
Have the float armatures that the float push up on been set to the proper height
of 10.5mm from the edge of the carb to the top of the float armature? (You
may have a tad bit of flooding). Could the floats themselves be a little heavy
causing some mild flooding?
--------
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442919#442919
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