Today's Message Index:
----------------------
1. 05:48 AM - Re: RotaxEngines-List Digest: 2 Msgs - 07/14/10 (Stan Tew)
2. 05:58 AM - Re: Re: rough running at 3400 RPM and above (Catz631@aol.com)
3. 06:21 AM - Re: Re: rough running at 3400 RPM and above (Scott DeMeyer)
4. 07:15 AM - Re: RotaxEngines-List Digest: 2 Msgs - 07/14/10 (R&M Wis)
5. 07:26 AM - Re: rough running at 3400 RPM and above (rayw)
6. 03:34 PM - Re: Re: rough running at 3400 RPM and above (Geoff & Bin Bell)
Message 1
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| Subject: | Re: RotaxEngines-List Digest: 2 Msgs - 07/14/10 |
I suggested last week - it could be ignition. There are several components in
the system. Start with the simple and easy Then work backward. Other words -
start with the plugs - change them, then move to the wires etc..
STAN 2
________________________________
From: RotaxEngines-List Digest Server <rotaxengines-list@matronics.com>
Sent: Thu, July 15, 2010 1:58:22 AM
Subject: RotaxEngines-List Digest: 2 Msgs - 07/14/10
*
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RotaxEngines-List Digest Archive
---
Total Messages Posted Wed 07/14/10: 2
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Today's Message Index:
----------------------
1. 07:14 PM - Re: rough running at 3400 RPM and above (MacDonald Doug)
2. 08:56 PM - Re: Re: rough running at 3400 RPM and above (E. D. Eliot)
________________________________ Message 1
_____________________________________
Time: 07:14:14 PM PST US
From: MacDonald Doug <dougsnash@yahoo.com>
Subject: RotaxEngines-List: Re: rough running at 3400 RPM and above
An update on my progress. I recieved the carb rebuild kits and have installed
them. Tonight I ran the engine up and it runs a bit better but still not right.
Now I am able to get it up to 3800 before it starts to miss and bog down.
Again, I am still able to get it up to over 4000 RPM by pulling on the
enrichener.
I performed a full carb sync on it today. I was able to get the gauge needles
to line up very nicely. While I had the carbs off for cleaning and rebuild, I
pulled the carb sockets off and they are like new, no indications of leaks.
I disconnected the fuel line where it goes into the engine fuel pump and checked
for flow from the electric Facet I am using in lieu of gravity feed. There
is a steady stream of fuel coming form the the line. I pulled the fuel lines
at the carb and ran the Facet again and am getting lots out of the carb fittings
too.
Next, I disconnected the airbox from the carb and had my assistant run the
engine
up. I watched the carb slide and at 3800RPM, the slide was about two thirds
to three quarters open. About where I think it should be at that power level.
I'm starting to think this might be an ignition problem. All of the plugs are
new and I gapped them when I installed them but I don't recall now what I gapped
them to. I see in the maintenance manual it says to gap them to 0.027 to 0.031.
I'll have to check that tomorrow and see where they are at.
I don't know guys, any suggestions?
Doug MacDonald
CH-701, North Western Ontario, Canada
________________________________ Message 2
_____________________________________
Time: 08:56:48 PM PST US
From: "E. D. Eliot" <gr8pugs@hotmail.com>
Subject: RE: RotaxEngines-List: Re: rough running at 3400 RPM and above
No experience with Rotax yet but did solve a few 'automobile engine problem
s' by first checking the resistance of the high tension wires. Once=2C I r
eplaced spark plugs and one of the 'new' ones was bad. God luck - we=3Bll
all learn from watching your progress.
> Date: Wed=2C 14 Jul 2010 19:12:19 -0700
> From: dougsnash@yahoo.com
> Subject: RotaxEngines-List: Re: rough running at 3400 RPM and above
> To: rotaxengines-list@matronics.com
>
com>
>
> An update on my progress. I recieved the carb rebuild kits and have inst
alled them. Tonight I ran the engine up and it runs a bit better but still
not right. Now I am able to get it up to 3800 before it starts to miss an
d bog down. Again=2C I am still able to get it up to over 4000 RPM by pull
ing on the enrichener.
>
> I performed a full carb sync on it today. I was able to get the gauge ne
edles to line up very nicely. While I had the carbs off for cleaning and r
ebuild=2C I pulled the carb sockets off and they are like new=2C no indicat
ions of leaks.
>
> I disconnected the fuel line where it goes into the engine fuel pump and
checked for flow from the electric Facet I am using in lieu of gravity feed
. There is a steady stream of fuel coming form the the line. I pulled the
fuel lines at the carb and ran the Facet again and am getting lots out of
the carb fittings too.
>
> Next=2C I disconnected the airbox from the carb and had my assistant run
the engine up. I watched the carb slide and at 3800RPM=2C the slide was ab
out two thirds to three quarters open. About where I think it should be at
that power level.
>
> I'm starting to think this might be an ignition problem. All of the plug
s are new and I gapped them when I installed them but I don't recall now wh
at I gapped them to. I see in the maintenance manual it says to gap them t
o 0.027 to 0.031. I'll have to check that tomorrow and see where they are
at.
>
> I don't know guys=2C any suggestions?
>
> Doug MacDonald
> CH-701=2C North Western Ontario=2C Canada
>
>
>
>
>
==========
==========
==========
==========
>
>
>
_________________________________________________________________
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Message 2
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| Subject: | Re: rough running at 3400 RPM and above |
Doug ,
Have you done a mag check? I had a rough runner and it showed up in the
mag check. After much work,frustration,etc I called Ronnie Smith at South
Mississippi Light Aircraft and he suggested I check the red power lead to the
coils for a break. I used a sewing pin with an ohm meter and attached one lead
to the pin (the other to ground). By penetrating the plastic shielding of
the wire I worked my way back along the wire and sure enough I found the
break along a flat run. It was totally invisible from looking at it. With a cut
and splice, I was back in business.
You could call Ronnie. He is very helpful and sure knows these engines!
Dick Maddux
912 Ul
Milton,Fl
Message 3
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| Subject: | Re: rough running at 3400 RPM and above |
I know this will sound silly but, do verify your spark plugs wires are goin
g to the correct cylinders. When I purchased my KF, I had a similar problem
and found that the guy I purchased from had swapped a couple of ignition w
ires. Once I put them on the correct cylinders, problem went away. Download
the Rotax heavy maintenance manual and compare with the schematics.
Scott
--- On Thu, 7/15/10, Catz631@aol.com <Catz631@aol.com> wrote:
From: Catz631@aol.com <Catz631@aol.com>
Subject: Re: RotaxEngines-List: Re: rough running at 3400 RPM and above
=0A =0ADoug ,=0A-Have you done a mag check? I had a rough runner and it s
howed up in the mag check. After much work,frustration,etc I called Ronnie
Smith at South Mississippi Light Aircraft and he suggested I check the red
power lead to the coils for a break. I used a sewing pin with an ohm meter
and-attached one lead -to the pin (the other to ground). By penetrating
the plastic shielding of the wire I worked my way back along the wire and
sure enough I found the break along a flat run. It was totally invisible fr
om looking at it. With a cut and splice, I was back in business.=0A-You c
ould call Ronnie. He is very helpful and sure knows these engines!=0A--
-------------------------
----------------- Dick Maddux=0A---
-------------------------
-----------------912 Ul=0A-----
-------------------------
-------------- Milton,Fl- =0A=0A
Message 4
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| Subject: | Re: RotaxEngines-List Digest: 2 Msgs - 07/14/10 |
Doug,
I have had this problem you describe. spraying carb cleaner into the jets
and visually inspecting is not enough. You need to tale a small piece of
stiff wire and work it around the jet orifice to get the "crust" to break
loose. This happened to me and the "crust" was in the main jet of just one
carb. I used the needle itself to break the crud loose but be careful not to
bend it.
Ray
----- Original Message -----
From: "RotaxEngines-List Digest Server" <rotaxengines-list@matronics.com>
Sent: Thursday, July 15, 2010 1:58 AM
Subject: RotaxEngines-List Digest: 2 Msgs - 07/14/10
> *
>
> =================================================
> Online Versions of Today's List Digest Archive
> =================================================
>
> Today's complete RotaxEngines-List Digest can also be found in either of
> the
> two Web Links listed below. The .html file includes the Digest formatted
> in HTML for viewing with a web browser and features Hyperlinked Indexes
> and Message Navigation. The .txt file includes the plain ASCII version
> of the RotaxEngines-List Digest and can be viewed with a generic text
> editor
> such as Notepad or with a web browser.
>
> HTML Version:
>
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 10-07-14&Archive=RotaxEngines
>
> Text Version:
>
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 10-07-14&Archive=RotaxEngines
>
>
> ===============================================
> EMail Version of Today's List Digest Archive
> ===============================================
>
>
> ----------------------------------------------------------
> RotaxEngines-List Digest Archive
> ---
> Total Messages Posted Wed 07/14/10: 2
> ----------------------------------------------------------
>
>
> Today's Message Index:
> ----------------------
>
> 1. 07:14 PM - Re: rough running at 3400 RPM and above (MacDonald
> Doug)
> 2. 08:56 PM - Re: Re: rough running at 3400 RPM and above (E. D.
> Eliot)
>
>
> ________________________________ Message 1
> _____________________________________
>
>
> Time: 07:14:14 PM PST US
> From: MacDonald Doug <dougsnash@yahoo.com>
> Subject: RotaxEngines-List: Re: rough running at 3400 RPM and above
>
>
> An update on my progress. I recieved the carb rebuild kits and have
> installed
> them. Tonight I ran the engine up and it runs a bit better but still not
> right.
> Now I am able to get it up to 3800 before it starts to miss and bog down.
> Again, I am still able to get it up to over 4000 RPM by pulling on the
> enrichener.
>
> I performed a full carb sync on it today. I was able to get the gauge
> needles
> to line up very nicely. While I had the carbs off for cleaning and
> rebuild, I
> pulled the carb sockets off and they are like new, no indications of
> leaks.
>
> I disconnected the fuel line where it goes into the engine fuel pump and
> checked
> for flow from the electric Facet I am using in lieu of gravity feed.
> There
> is a steady stream of fuel coming form the the line. I pulled the fuel
> lines
> at the carb and ran the Facet again and am getting lots out of the carb
> fittings
> too.
>
> Next, I disconnected the airbox from the carb and had my assistant run the
> engine
> up. I watched the carb slide and at 3800RPM, the slide was about two
> thirds
> to three quarters open. About where I think it should be at that power
> level.
>
> I'm starting to think this might be an ignition problem. All of the plugs
> are
> new and I gapped them when I installed them but I don't recall now what I
> gapped
> them to. I see in the maintenance manual it says to gap them to 0.027 to
> 0.031.
> I'll have to check that tomorrow and see where they are at.
>
> I don't know guys, any suggestions?
>
> Doug MacDonald
> CH-701, North Western Ontario, Canada
>
>
> ________________________________ Message 2
> _____________________________________
>
>
> Time: 08:56:48 PM PST US
> From: "E. D. Eliot" <gr8pugs@hotmail.com>
> Subject: RE: RotaxEngines-List: Re: rough running at 3400 RPM and above
>
>
> No experience with Rotax yet but did solve a few 'automobile engine
> problem
> s' by first checking the resistance of the high tension wires. Once=2C I
> r
> eplaced spark plugs and one of the 'new' ones was bad. God luck -
> we=3Bll
> all learn from watching your progress.
>
>> Date: Wed=2C 14 Jul 2010 19:12:19 -0700
>> From: dougsnash@yahoo.com
>> Subject: RotaxEngines-List: Re: rough running at 3400 RPM and above
>> To: rotaxengines-list@matronics.com
>>
> com>
>>
>> An update on my progress. I recieved the carb rebuild kits and have inst
> alled them. Tonight I ran the engine up and it runs a bit better but
> still
> not right. Now I am able to get it up to 3800 before it starts to miss an
> d bog down. Again=2C I am still able to get it up to over 4000 RPM by
> pull
> ing on the enrichener.
>>
>> I performed a full carb sync on it today. I was able to get the gauge ne
> edles to line up very nicely. While I had the carbs off for cleaning and
> r
> ebuild=2C I pulled the carb sockets off and they are like new=2C no
> indicat
> ions of leaks.
>>
>> I disconnected the fuel line where it goes into the engine fuel pump and
> checked for flow from the electric Facet I am using in lieu of gravity
> feed
> . There is a steady stream of fuel coming form the the line. I pulled
> the
> fuel lines at the carb and ran the Facet again and am getting lots out of
> the carb fittings too.
>>
>> Next=2C I disconnected the airbox from the carb and had my assistant run
> the engine up. I watched the carb slide and at 3800RPM=2C the slide was
> ab
> out two thirds to three quarters open. About where I think it should be
> at
> that power level.
>>
>> I'm starting to think this might be an ignition problem. All of the plug
> s are new and I gapped them when I installed them but I don't recall now
> wh
> at I gapped them to. I see in the maintenance manual it says to gap them
> t
> o 0.027 to 0.031. I'll have to check that tomorrow and see where they are
> at.
>>
>> I don't know guys=2C any suggestions?
>>
>> Doug MacDonald
>> CH-701=2C North Western Ontario=2C Canada
>>
>>
>>
>>
>>
> ==========
> ==========
> ==========
> ==========
>>
>>
>>
>
> _________________________________________________________________
> The New Busy is not the too busy. Combine all your e-mail accounts with
> Hot
> mail.
> http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=P
> ID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4
>
>
>
Message 5
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| Subject: | Re: rough running at 3400 RPM and above |
Doug,
I have had this problem you describe. Spraying carb cleaner into the jets and visually
inspecting is not enough. You need to take a small piece of stiff wire
and work it around the jet ofice to get the "crust" to break loose. This happened
to me and the "crust" was in the main jet of just one carb.
I actually used the needle from the jet and not a piece of wire. I was careful
not to bend the needle.
Ray
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=304896#304896
Message 6
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| Subject: | Re: rough running at 3400 RPM and above |
Hi Doug,
Have you tried a diferent Prop. I had the oppertunity to try some diferent
props a few years ago, and each caused a diferent rough spot in the engine.
Worth a go to eliminate that as the problem.
Cheers
Gtblu
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