aviateer
Joined: 08 Aug 2008
Posts: 23
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 Posted: Fri Mar 19, 2010 9:11 am Post subject: RotaxEngines-List Digest: 7 Msgs - 03/15/10 |
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Scott,
Is there any black "mist" inside your intake manifold? Have you been adding anything to your fuel (e.g. Stabil, or SeaFoam)? These chemicals may contain propenol (or other alcohols) that may not be compatible with your fuel tanks. I was having the same problem. I took off the tanks and cleaned out all the old "Kreem" fuel tank liner with acetone. Then resloshed with Kreem cut with MEK. I also replaced the old fuel lines with blue translucent fuel line. I took a Q-tip with alcohol on it and swabbed a sample of my black fuel line. The Q-tip turned black. I conducted the same test with a section of blue tubing and found the Q-tip to be clean.
The problem is that the resin used in the fuel tank can leach into the alcohol and not show up until it is atomized passed the carburetor. Hence, the black "mist" in the intake manifold passed the carburetors.
Kirk
On Tue, Mar 16, 2010 at 1:57 AM, RotaxEngines-List Digest Server <rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)> wrote:
[quote]*
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RotaxEngines-List Digest Archive
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Total Messages Posted Mon 03/15/10: 7
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Today's Message Index:
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1. 07:25 AM - My 912 is still not happy-- (sdemeyer)
2. 09:23 AM - Re: My 912 is still not happy-- (Chris Blackmore)
3. 02:20 PM - Re: My 912 is still not happy-- (jason parker)
4. 03:00 PM - Re: My 912 is still not happy-- (Brian Davies)
5. 03:04 PM - Re: My 912 is still not happy-- (Ollie Washburn)
6. 03:56 PM - Re: My 912 is still not happy-- (Pete Christensen)
7. 07:16 PM - Re: My 912 is still not happy-- (Carl)
________________________________ Message 1 _____________________________________
Time: 07:25:59 AM PST US
Subject: RotaxEngines-List: My 912 is still not happy--
From: "sdemeyer" <scottsr1100rt(at)yahoo.com (scottsr1100rt(at)yahoo.com)>
Hi Guys,
I'm out of ideas on why my 912UL continues to run rough in midrange between 2000
and 3500 RPM. I've rebuilt the carbs, I've sent the carbs in and had them gone
through again, I've replaced the entire ignition system including modules,coils,trigger
coils and stator, spark plug wires, plug boots and spark plugs. I've
balanced the carbs several times with my carbemate. Compression is good in
all cylinders - 80/87.
When I say rough running, I mean the engine shakes and misfires quite noticeably
between 2000 and 3500 RPM.
Any suggestions on what to check next would be quite helpful!
Thanks
Scott
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=290350#290350
________________________________ Message 2 _____________________________________
Time: 09:23:33 AM PST US
From: "Chris Blackmore" <blackmore(at)platinum.ca (blackmore(at)platinum.ca)>
Subject: Re: My 912 is still not happy--
Bad fuel, sticky / bent valves that clutch thing that was recently talked
about. Cracked porcelain on plug,plugged fuel line/filter/pump? Mag switc
h
/mag,bad ground, put an old fashioned scanner in it to see what the spark
is
doing
Chris
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