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Old 01-27-2021, 12:56 PM
trecool44 trecool44 is offline
Join Date: Oct 2020
Location: Weirsdale
Posts: 16

I had my 55 gallon tank filled a few times while still having this issue.
2010 - RV12 and Loving it
Central Florida
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Old 02-28-2021, 08:25 AM
Art_N412SB's Avatar
Art_N412SB Art_N412SB is offline
Join Date: Sep 2017
Location: Gig Harbor
Posts: 38

Originally Posted by seagull View Post
trecool44, The front cylinders do not get the same mixture as the rear cylinders because of the longer intake manifold.
We have been having the same rough running issues. We were wondering why the plugs on our front cylinders were black and the aft cylinder plugs were clean. We did not realize that the front cylinders have a different fuel/air ratio due to their longer manifold distance. Thanks
Art Tiller
Pacific Northwest
RV-12 Owner
UH1H VN 1972
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Old 02-28-2021, 08:48 AM
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Piper J3 Piper J3 is online now
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,373

It's been more than two months since OP started this thread. I believe he was going to try replace ignition parts. Did trecool44 resolve his problem?
Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 650

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MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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