Today's Message Index:
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1. 09:27 AM - Re: 912 rough running below 3000 rpm (David Weaver)
2. 01:29 PM - Re: 912 rough running below 3000 rpm (Flynn Elliott)
3. 10:04 PM - Re: 912 rough running below 3000 rpm (rampil)
Message 1
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| Subject: | Re: 912 rough running below 3000 rpm |
I have seen the problem you have described.=C2- When a carb idle jet beco
mes blocked, the engine will shake at RPM below 3,000.=C2- Then the float
s of both carbs begin to bounce, which contributes to the engine running ro
ugh (floats become incompetent).=C2- By removing the float bowls of both
carbs you can remove the idle jet in each carb for inspection under a brigh
t lite.=C2- I found a very small spec of fuel hose lining blocked a jet o
n one of my carbs.=C2- Probably happened when I installed a carb fuel hos
e on a barb fitting.Dave Weaver N912GR
On Friday, May 22, 2015 2:52 PM, Flynn Elliott <foxflynn@worldonline.c
o.za> wrote:
line.co.za>
Good thought John
Thanks
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of John
Hauck
Sent: 22 May 2015 08:57 PM
Subject: RE: RotaxEngines-List: 912 rough running below 3000 rpm
--> <jhauck@elmore.rr.com>
I run a single strand copper wire through them to insure they are clean.
Copper won't scratch the jet.
john h
mkIII
Titus, Alabama
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Flynn
Elliott
Sent: Friday, May 22, 2015 1:19 PM
Subject: RE: RotaxEngines-List: 912 rough running below 3000 rpm
--> <foxflynn@worldonline.co.za>
Thanks John, will pull them out and double check Again .
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of John
Hauck
Sent: 22 May 2015 06:25 PM
Subject: RE: RotaxEngines-List: 912 rough running below 3000 rpm
--> <jhauck@elmore.rr.com>
Insure both idle jets are completely open.
Over the years I have discovered a rough or no run 912ULS below 3000 rpm is
idle jet related.
Idle jet is extremely small.=C2- A tiny bit of trash makes a lot of diffe
rence
on fuel flow.
For what it is worth.
john h
mkIII
Titus, Alabama
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of flynn
elliott
Sent: Friday, May 22, 2015 11:12 AM
Subject: RotaxEngines-List: 912 rough running below 3000 rpm
<foxflynn@worldonline.co.za>
Hi Guys, could really use some help with a 912s.
After leaving my Foxbat for two months , she started up just fine as usual
but ran as rough as hell untill 3000rpm and up where the motor runs smooth
as silk.
As always the fuel had been drained and fresh put in after the layup. We
have since cleaned the carbs, put new float bowl gaskets, a fresh set of
plugs and had my A P balance the carbs, which were real close anyway.
The start up is instant as always has been, the mag drop is inconsistant,
sometimes between 100 and 200=C2- and very rough below below 3000rpm yet
back
to its usual 50rpm drop above.
Original plugs went back in and gave the same result.
I flew for half an hour yesterday in the hope of clearing the problem but n
o
way, as I closed the throttle for landing we were back to a very rough
motor.
Any help would be more than appreciated.
Thanks
Flynn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442457#442457
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S -
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=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 2
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| Subject: | 912 rough running below 3000 rpm |
Hi Dave,
Thanks for your input, every one seems to be in the same mind over this
issue. Will get on it asap and report back .
Flynn
Sent: 23 May 2015 06:26 PM
Subject: Re: RotaxEngines-List: 912 rough running below 3000 rpm
I have seen the problem you have described. When a carb idle jet
becomes blocked, the engine will shake at RPM below 3,000. Then the
floats of both carbs begin to bounce, which contributes to the engine
running rough (floats become incompetent). By removing the float bowls
of both carbs you can remove the idle jet in each carb for inspection
under a bright lite. I found a very small spec of fuel hose lining
blocked a jet on one of my carbs. Probably happened when I installed a
carb fuel hose on a barb fitting.
Dave Weaver N912GR
On Friday, May 22, 2015 2:52 PM, Flynn Elliott
<foxflynn@worldonline.co.za> wrote:
<foxflynn@worldonline.co.za>
Good thought John
Thanks
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of John
Hauck
Sent: 22 May 2015 08:57 PM
Subject: RE: RotaxEngines-List: 912 rough running below 3000 rpm
--> <jhauck@elmore.rr.com>
I run a single strand copper wire through them to insure they are clean.
Copper won't scratch the jet.
john h
mkIII
Titus, Alabama
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Flynn
Elliott
Sent: Friday, May 22, 2015 1:19 PM
Subject: RE: RotaxEngines-List: 912 rough running below 3000 rpm
--> <foxflynn@worldonline.co.za>
Thanks John, will pull them out and double check Again .
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of John
Hauck
Sent: 22 May 2015 06:25 PM
Subject: RE: RotaxEngines-List: 912 rough running below 3000 rpm
--> <jhauck@elmore.rr.com>
Insure both idle jets are completely open.
Over the years I have discovered a rough or no run 912ULS below 3000 rpm
is
idle jet related.
Idle jet is extremely small. A tiny bit of trash makes a lot of
difference
on fuel flow.
For what it is worth.
john h
mkIII
Titus, Alabama
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of flynn
elliott
Sent: Friday, May 22, 2015 11:12 AM
Subject: RotaxEngines-List: 912 rough running below 3000 rpm
<foxflynn@worldonline.co.za>
Hi Guys, could really use some help with a 912s.
After leaving my Foxbat for two months , she started up just fine as
usual
but ran as rough as hell untill 3000rpm and up where the motor runs
smooth
as silk.
As always the fuel had been drained and fresh put in after the layup. We
have since cleaned the carbs, put new float bowl gaskets, a fresh set of
plugs and had my A P balance the carbs, which were real close anyway.
The start up is instant as always has been, the mag drop is
inconsistant,
sometimes between 100 and 200 and very rough below below 3000rpm yet
back
to its usual 50rpm drop above.
Original plugs went back in and gave the same result.
I flew for half an hour yesterday in the hope of clearing the problem
but no
way, as I closed the throttle for landing we were back to a very rough
motor.
Any help would be more than appreciated.
Thanks
Flynn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442457#442457
-----
No virus found in this message.
Checked by AVG - www.avg.com
-----
No virus found in this message.
C========================
No virus found in this message.
Checked by AVG - www.avg.com
05/23/15
Message 3
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| Subject: | Re: 912 rough running below 3000 rpm |
Here's another thought.
At mid range or less throttle, one of the carb
slides may stick in the barrel, unbalancing
the engine. Did you A&P try balancing
down in the throttle range where you see the
trouble?
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442517#442517
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