john(at)leptron.com
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 Posted: Mon Jun 25, 2007 2:31 pm Post subject: No Title |
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Barry,
It sounds like you had a seizure. I would do a compression test before I touch anything else..
John Oakley
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of Barry West
Sent: Monday, June 25, 2007 8:37 AM
To: Kitfox List
Subject:
Engine Running Rough
In January, 2007 my Kitfox IV with a 912 S engine threw all three blades of my GSC propeller. There was one big “bump,” the engine stopped and I landed without incidence. Observation of the engine revealed that both carburetors came off and the engine mount was damaged. I sent the gearbox to Lockwood and performed a runout test on the crankshaft with no damage either indicated. After installing a new propeller and engine mount, the engine ran fine for about 12 hours of local flights.
Then, Saturday before last, June 16, during a Young Eagles rally, the engine started running rough. It would idle smooth but became very rough at about 3000 rpm. I suspected a kinked fuel line, removed the fire shield, saw nothing, and replaced it. Then it ran smooth and I flew it a few times with no problem. The next day I flew it about an hour with no problem. Last Friday, June 22, I started it and it was rough again at about 3000 rpm – I mean really rough and would not run at a higher rpm. In both of these situations the right carburetor was considerably cooler than the left.
At this point, I thought it appropriate to run a compression check but when I removed the first spark plug I saw it was heavily coated with soot. I removed all the plugs and they all were the same way. Then I opened both carburetors, top and bottom, but could see nothing that would cause the mixture to be rich. These plugs only had about 25 hours on them. I installed a set of old but clean plugs and put the carburetors back together, started the engine and this time it went to about 4000 rpm before cutting out and running rough. Now the carburetors are both about the same temperature. I removed the top plugs and the ones on the left side were clean and the ones on the right side were covered with soot.
What to do? I tend to believe the shock of losing the propeller blades caused some kind of problem with the carburetors.
Barry West
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