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John Jung
Joined: 10 Jan 2006
Posts: 108
Location: Surprise, AZ, USA
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 Posted: Mon Nov 13, 2006 6:21 pm Post subject: Need 503 help! |
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Group,
Last Friday, I flew my Firestar for the first time since last spring. No problems at all until I shut the engine off on the runway to get out and measure a short landing. When I got back in the plane, it would not fire, not even once. Today, I pulled the plugs out put them back in the caps, and cranked the engine over while watching for spark. No spark on any of the 4 plugs. Next, I disconnected both "kill" wires at the engine to isolate my wiring and switch. Still no spark. I pulled the flywheel to inspect for damage underneath. Eveything looked normal. I'm at a loss. I don't know what to do next. Ideas?
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John Jung
Firestar II N6163J
Surprise, AZ |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Mon Nov 13, 2006 6:41 pm Post subject: Need 503 help! |
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Eveything looked normal. I'm at a loss. I don't know what to do next.
Ideas?
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| John Jung
JJ:
Get the Rotax book off the internet that has the procedure for
checking ignition modules, coils, alternator stator, etc.
Call Ronnie Smith at South Mississippi Light Aircraft and he can lead
you in the right direction. There is a pretty simple check list for
the 912 engines which use similar electrical/ign components, but
different values.
Personally, I hate electrical problems, engine and avionics.
john h
mkIII
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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John Jung
Joined: 10 Jan 2006
Posts: 108
Location: Surprise, AZ, USA
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| Posted: Fri Nov 17, 2006 5:56 pm Post subject: Re: Need 503 help! |
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| John Hauck wrote: |
JJ:
Get the Rotax book off the internet that has the procedure for
checking ignition modules, coils, alternator stator, etc.
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Thanks, John H.
I looked up the how to test the ignition system, did all the tests and everything passed. My flying buddy, Chuck, sugested that maybe there was spark but I didn't see it because of too much daylight. I put everything back together today, closed the hanger doors, and sure enough, I had spark on all plugs. To satisfy myself, I opened the doors again and repeated the test. No visable spark.
So, I learned a lesson about Ducati ignitions, but now I still need to find out why my engine didn't start.
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John Jung
Firestar II N6163J
Surprise, AZ |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Fri Nov 17, 2006 7:01 pm Post subject: Need 503 help! |
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| So, I learned a lesson about Ducati ignitions, but now I still need
to find out why my engine didn't start.
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| John Jung
John J:
Don't remember what the book says about spark plug gap. We also use a
Ducati ignition on the 912 series engines. The book calls for .028",
but many of us run with .020 to .022" gap because there are times the
standard gap will not fire during start up. Might try closing the gap
up a bit and see if that helps.
john h
mkIII
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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John Jung
Joined: 10 Jan 2006
Posts: 108
Location: Surprise, AZ, USA
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| Posted: Sat Nov 18, 2006 5:27 am Post subject: Re: Need 503 help! |
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| John Hauck wrote: |
John J:
Don't remember what the book says about spark plug gap. We also use a
Ducati ignition on the 912 series engines. The book calls for .028",
but many of us run with .020 to .022" gap because there are times the
standard gap will not fire during start up. Might try closing the gap
up a bit and see if that helps.
john h
mkIII |
Plugs are at .014 - .018 per the book for a 503 Ducati. I will be doing some testing to try to find out what is going on with the engine. It seems to be getting fussy and I am losing confidence it it.
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John Jung
Firestar II N6163J
Surprise, AZ |
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possums(at)bellsouth.net
Guest
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| Posted: Sat Nov 18, 2006 7:27 am Post subject: Need 503 help! |
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At 08:56 PM 11/17/2006, you wrote:
| Quote: |
I looked up the how to test the ignition system, did all the tests
and everything passed. My flying buddy, Chuck, sugested that maybe
there was spark but I didn't see it because of too much daylight. I
put everything back together today, closed the hanger doors, and
sure enough, I had spark on all plugs. To satisfy myself, I opened
the doors again and repeated the test. No visable spark.
So, I learned a lesson about Ducati ignitions, but now I still need
to find out why my engine didn't start.
--------
John Jung
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Might want to make sure the "vent lines" aren't clogged up.
If it's a single carb, it won't start if the the holes in the bottom
of theses little tubes are clogged.
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John Jung
Joined: 10 Jan 2006
Posts: 108
Location: Surprise, AZ, USA
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| Posted: Sun Nov 26, 2006 5:14 pm Post subject: Re: Need 503 help! |
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Group,
I believe that I solved the problem. It was the battery. After doing a lot of checking, I discovered that the size battery that I have been using was less than recommended. The 503 manual said 13 AmpHr minimum and I was using a 9 AmpHr. So, I bought a 16 AmpHr battery and installed it today. Now, when I turn the key, it starts immediately.
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John Jung
Firestar II N6163J
Surprise, AZ |
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