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ppeerenbo(at)charter.net
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 Posted: Mon May 28, 2007 11:57 am Post subject: 912UL starting problems. |
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Need some help with a 912UL 300TT not starting after being off for a year.
Have fuel at the carbs cleaned and new diaphragms installed. I can put my
hand over the carb inlets and turn it over and get lots of fuel. Getting
very weak spark and has only fired once or twice in hours of testing. Eng
turning over well (have jumped it ) I am looking if anyone knows what the
voltage outputs from the CDI boxes to the ignition coils should be? I have 8
volts wile cranking at the red generator ignition circuit cables circuit to
ground ( both the same ) I get about 12 to 13 volts to the coils is this
correct or too low? I have the old style interference box but new style
plugs. ( I replace them for something )
Paul Peerenboom
Kitfox IV 912UL 300TT
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kitfoxmike
Joined: 05 Dec 2006
Posts: 373
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| Posted: Mon May 28, 2007 12:08 pm Post subject: Re: 912UL starting problems. |
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plugs may be fouled, clean or replace and try again.
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experimental208nd(at)comc
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| Posted: Mon May 28, 2007 5:18 pm Post subject: 912UL starting problems. |
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I thought I had read something some where about NOT testing spark on your
plugs by pulling the plug and testing it by laying it on the side of the
frame.( like on a mower or dirt bike). I think that fries the Ign box?
Just a thought, to be careful.
Jay
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kitfoxmike
Joined: 05 Dec 2006
Posts: 373
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| Posted: Tue May 29, 2007 5:58 am Post subject: Re: 912UL starting problems. |
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THere is something that happens with the 912 engine in a fox. After sitting a while the oil will run into the back of the engine, then it fills the back two cylinders (runs past the rings) and then to clear it you need to remove the back cylinder plugs and spray brake cleaner or solvent into the cylinder to clean it out and blow air in there, then put in clean or replace the plugs.
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pwmac(at)sisna.com
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| Posted: Tue May 29, 2007 7:48 am Post subject: 912UL starting problems. |
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Viscosity of your oil? Heavier is better
=================
At 07:58 AM 5/29/2007, you wrote:
| Quote: |
THere is something that happens with the 912 engine in a fox. After
sitting a while the oil will run into the back of the engine, then
it fills the back two cylinders (runs past the rings) and then to
clear it you need to remove the back cylinder plugs and spray brake
cleaner or solvent into the cylinder to clean it out and blow air in
there, then put in clean or replace the plugs.
--------
kitfoxmike
model IV, 1200
speedster
912ul
building
RV7a
slowbuild wings, fuse
Do not archive
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kitfoxmike
Joined: 05 Dec 2006
Posts: 373
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| Posted: Tue May 29, 2007 9:48 am Post subject: Re: 912UL starting problems. |
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I don't think the vis. of the oil will do much for the year storage and the drain back into the engine from the oil reservoir. When I had my fox sitting for 9 months it did it. I just removed the spark plugs, put some solvent in the cylinders and then drained the oil in the block, removed the rear plug(real pain), found I needed to replace the return hose so two things taken care of at the same time. Glad I saw this before starting or tried to start the engine because I woud think the engine would have locked on top dead of the rear cyl. as well.
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