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Dick Maddux
Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl
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 Posted: Fri Sep 09, 2016 5:11 am Post subject: Rough running 912 ULRough running 912 ULRough running 912 |
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Hugh,
I had the same type of problem a couple of years ago. I went thru all the checks as you have. Actually I have had that problem a few times. One time it was a broken internal wire coming from the back of the engine to the module. I found it with a needle and an ohm meter. (forgot the proper name but it was the red one)
Another time I trimmed the ignition leads and replaced the spark plug caps after the trimming didn't work. The new caps worked as a couple of old ones checked bad resistance wise.
By the way on another occasion I replaced the plugs with new ones and still had a misfire problem. When I "bomb" checked the "new " plugs,2 of them were bad and I had to replace those again !
These engines can be a nightmare (at least mine) I have often thought about putting Velcro on my cowling so I can remove it easier!
Again keep us posted if you find the problem because it will quite likely happen to any one of us
Dick Maddux
912 UL
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Dick Maddux
Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl
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| Posted: Fri Sep 09, 2016 5:22 am Post subject: Rough running 912 ULRough running 912 ULRough running 912 |
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Hugh,
John does bring up a point with the needle settings in the carb. The last 2 years my mag checks in the winter have not been good on the ground. I would have a drop of about 300 rpm on each one. Now if I did a mag check in the air they were fine. I couldn't figure it out. I live in hot,muggy,steamy,FLAT Florida (I miss mountains) The temps don't get very cold here but I think John might have a solution to my problem. When the weather warms up my mag problem goes away.
Will see what this winter brings (hurry up winter !!!!!!!)
Dick Maddux
912 UL
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