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ppeerenbo(at)charter.net
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 Posted: Sat May 12, 2007 7:38 am Post subject: 912UL starting problems. |
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Looking for input on 912 that I can't get started. It was off the airframe
for a year geting a new mount. The ignition system is what I could use the
input on. I have wet plugs. I have checked the ignition switiches, ohmed the
triger coils (3.4). I can't find other checks on the boxes. It has not poped
once. It's turning over fast and I did jump it also.
Paul N102DG
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davyken(at)comcast.net
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| Posted: Sun May 13, 2007 3:49 am Post subject: 912UL starting problems. |
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Hi Paul,
I've just spent a lot of time and money working through exactly that issue. I felt I was almost done with my Kitfox and then spent five years traveling full time for work. My 912 sat and waited for me. When I had time to work on the plane again I came to the point where I was ready to start it up and had exactly the same condition you have. I proved I had spark and the plugs were wet. The engine would crank but wouldn't fire up.
I got several pieces of good advice from several sources.
The Sport Pilot articles by Phil Lockwood on the perfect 912 installation are available on line at the EAA web site. Look for the "Power On" column. He had some good advice making sure I had the right mixture.
"You need three things to get your engine to start. It must crank at a minimum speed of 240 rpm. If all is not well with the battery, electrical connections, and wire sizing, you will not achieve this speed. A fully charged battery will have 12.6 volts or more. You must make sure your ignition circuits are wired properly. Remember, the 912 ignition is a failsafe unit that is self-powered. You must ground out the two kill switch wires to shut it off, but if they are wired backward, then it will be shut off while you are trying to start. You must have the correct amount of fuel. If the air temperature is below 50 degrees Fahrenheit, your choke will need to be functioning properly, and you must use the correct procedure, which includes having the throttle at idle until the engine starts. If you crack the throttle as you are trying to start, the enrichenin g circ uit (choke) will not work well. The throttle butterfly in each carburetor must be almost all the way closed to draw enough extra fuel for a cold start. The idle and main jets, in both carburetors, must be clean and clear of obstructions."
I also received some good advice from the list about the choke pull. The springs on the 912 choke hold a lot of tension and the knob provided by Skystar is somewhat on the small side. I drilled a hole through the knob and put a key ring through it to make sure I was getting the full travel on the cable pull.
The final thing that made a big difference was rebuilding the carbs. I had a mechanic with a good reputation for Rotax engines disassemble them. He found that some of the rubber had dry rotted from sitting so long. He also sent me replacement mounting flanges and o-rings for the manifold.
Once I reassembled everything, I got a good start. My 912 runs great now and I'm getting the plane ready for it's inspection.
Hope this helps,
Ken Davy
N1701S Classic IV / 912
Time: 08:38:41 AM PST US
From: "Paul" <ppeerenbo(at)charter.net>
Subject: 912UL starting problems.
Looking for input on 912 that I can't get started. It was off the airframe
for a year geting a new mount. The ignition system is what I could use the
input on. I have wet plugs. I have checked the ignition switiches, ohmed the
triger coils (3.4). I can't find other checks on the boxes. It has not poped
once. It's turning over fast and I did jump it also.
Paul N102DG
[quote][b]
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http://www.matronics.com/Navigator?Kitfox-List |
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