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stan_tew(at)yahoo.com
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 Posted: Thu Jul 15, 2010 4:48 am Post subject: RotaxEngines-List Digest: 2 Msgs - 07/14/10 |
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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(at)matronics.com>
To: RotaxEngines-List Digest List <rotaxengines-list-digest(at)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
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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(at)yahoo.com (dougsnash(at)yahoo.com)>
Subject: 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(at)hotmail.com (gr8pugs(at)hotmail.com)>
Subject: RE: 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.
| Quote: |
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.
| Quote: |
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.
| Quote: |
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.
| Quote: |
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.
| Quote: |
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.
| Quote: |
I don't know guys=2C any suggestions?
Doug MacDonald
CH-701=2C North Western Ontario=2C Canada
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rayw
Joined: 18 Jul 2009
Posts: 25
Location: Wisconsin, Central
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| Posted: Thu Jul 15, 2010 6:15 am Post subject: RotaxEngines-List Digest: 2 Msgs - 07/14/10 |
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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
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