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912 uls likes to fowl front cylinders right mag only

  • Gerad Poxleitner
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1 week 13 hours ago #18258 by Gerad Poxleitner
Gerad Poxleitner created the topic: 912 uls likes to fowl front cylinders right mag only
I have a 912 uls that i have been trying to figure it out it fowls the 2 front cylinders when it sits for a few days i have shut the fuel off and run it dry and make sure i purge the oil out of the motor still does it syinked the carbs 50 times new gear box the carbs are new before I got it but previous owner had the same problem that's y they were replaced. I can put new plugs in and fly it and have no issues for about 2 flights 3 flight it will have a 3 to 400 mag drop by turning off the left mag so that means it is on the right mag I would think always the same has soft start module on it. Had annual done all compression is 78 over 80 all 4 cylinders. it is a Rans s7s if that matters had another motor just like this in a same style airframe and never had this issue. the plugs will be black when you pull them upper and lower and it varies from right to left on the front cylinders never the rear ones change the plugs and runs like a top all day for 2 flights no problem. Thanks in advance.

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1 week 11 hours ago #18259 by BROTAX
BROTAX replied the topic: 912 uls likes to fowl front cylinders right mag only
What oil filter are you using?

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1 week 2 hours ago #18261 by Gerad Poxleitner
Gerad Poxleitner replied the topic: 912 uls likes to fowl front cylinders right mag only
The rotax filters oil change every 25 hrs

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6 days 10 hours ago #18271 by Rob Seaton
Rob Seaton replied the topic: 912 uls likes to fowl front cylinders right mag only
the #1 and #2 plugs will usually be darker, this is due to unequal fuel distribution at idle.
The S7 engine mount allows the engine shake at idle, making this situation worse.
Try checking your plugs after a flight, and before a lot of idling time. they will probably be OK.

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6 days 7 hours ago #18275 by Gerad Poxleitner
Gerad Poxleitner replied the topic: 912 uls likes to fowl front cylinders right mag only
I will check it it seems to be worse when you fly it a couple times let it sit for a week and then it will for sure almost need plugs sometimes a loop around the pattern and it will clean them up some times.

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