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mmarks(at)sentex.net
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 Posted: Mon Apr 17, 2006 7:41 am Post subject: engine miss |
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Good Morning, new to the forum and find it very interesting.
Hope someone could help with my problem.
Just got the Kitfox flying after a three month stay in hanger due to winter and soft field. Have put about 4 hours on it in the last couple of weeks
We have a small engine miss if we cruise at 4600 to 4800 rpm. If carb heat is pulled the engine smooths out perfectly. If 5000 rpm is used the engine is fine.
I assumed it was a mixture problem or a plug problem as carb heat will richen the mixture so I pulled the plugs, I found the front clyinder plugs on the black colour side so I really do not want to richen the mixture any more, the back plugs were perfect colour. Gap was also perfect at 27.6 th.
We are running a 912 u engine with DCPR7E plugs.
Would appreciate any help or suggestions.
Thanks
Marty Marks
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bmwebb(at)cox.net
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| Posted: Mon Apr 17, 2006 7:51 am Post subject: engine miss |
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Marty,
If your carbs are jetted identically, then the difference is due to an air
leak in the rear cylinder. Basically, your mixture is set too rich, and the
leak is leaning out the rear cylinder to the correct mixture.
Check and double check the intake tracks post-carb. Re-torque the intake
bolts, even get new gaskets.
Bradley
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mmarks(at)sentex.net
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| Posted: Mon Apr 17, 2006 8:12 am Post subject: engine miss |
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Tks Bradley, will give it a try.
Marty
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FLIER(at)sbcglobal.net
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| Posted: Mon Apr 17, 2006 10:37 am Post subject: engine miss |
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Gents,
I have the same situation with dark front plugs and
good looking rear. Both sides. I don't think that's
due to an air leak. Always been that way.
Regards,
Ted
--- Original Message ---
From: "Marty Marks" <mmarks(at)sentex.net>
To: <kitfox-list(at)matronics.com>
Subject: Re: engine miss
| Quote: |
<mmarks(at)sentex.net>
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[quote]
Tks Bradley, will give it a try.
Marty
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kerrjohna(at)comcast.net
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| Posted: Mon Apr 17, 2006 1:16 pm Post subject: engine miss |
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were dealing with a 912 here, correct? are the plugs on both front carburators sooty?
The soot test can be a problem. The plugs can soot up with longish taxi if the idle mixture is too rich...etc.
Disregarding the soot on the plugs, it sounds like the main jet is correct but that the circlip on the needle might be lowered allowing a richer mixture in the mid range.
I really benefited from a bing manual from Bing International 1-800-309-2464.
John Kerr
-------------- Original message --------------
From: "Bradley M Webb" <bmwebb(at)cox.net>
[quote]
Marty,
If your carbs are jetted identically, then the difference is due to an air
leak in the rear cylinder. Basically, your mixture is set too rich, and the
leak is leaning out the rear cylinder to the correct mixture.
Check and double check the intake tracks post-carb. Re-torque the intake
bolts, even get new gaskets.
Bradley
--
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pulsair(at)mindspring.com
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| Posted: Mon Apr 17, 2006 4:36 pm Post subject: Engine miss |
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If you stand and stare at your engine which I have done many times ( not in amazement but in frustration) you can see the reason there is a different color on the front and rear plugs. The intake on the rear does an immediate 90 degree bend with a very short distance. The front intake is a longer distance kind of straight. Hence the leaner on the rear and richer on the front. Also, Pierre Landry told me that if you remember him. He spent 6 months of the year in Austria at the Rotax factory and 6 months in Canada working for Rotax there. Jeff Classic IV Columbus, Ohio
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mmarks(at)sentex.net
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| Posted: Mon Apr 17, 2006 4:36 pm Post subject: engine miss |
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Thanks John, yes 912 and the front plugs are sooty.
We will check the circlip as well. Thanks.
Marty
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