912 ignition wiring

Re: 912 ignition wiring

by Neil Cooper » 9 years ago

Neil Cooper

23 67 92

Thanks. Can I replace them with the coils in place or do I have to pull the whole lot apart?

Re: 912 ignition wiring

by Neil Cooper » 9 years ago

Neil Cooper

23 67 92

Thanks for the help.
It looks hard to get at the leads but I'd rather not have to pull all the coils out. How hard is it to just attach the new leads to the coils while in place?

image_2016-04-11.jpeg (You do not have access to download this file.)

Re: 912 ignition wiring

by Roger Lee » 9 years ago

Roger Lee

131 5.38k 5.44k

You have quite a bit of stuff in the way that needs to be moved enough to get your hands in there to the coils.

Is there a reason you want to change out the wires. They tend to make TBO without any issues as a rule.

---

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Re: 912 ignition wiring

by Neil Cooper » 9 years ago

Neil Cooper

23 67 92

I thought they might need changing just from being old. The aircraft is 12 years old but only 450hrs.
I have been getting a rough mag check out lower rpm. It is fine at 4000 but at 3000rpm it is rough.
Same in flight.
At 5200rpm it runs fine on one ignition, but at 5000 it runs rough. In fact if I run at 5000 in the cruise for a while then go to 5200 and check one circuit (B I think) it will run rough. After a while at 5200 it clears. Almost like it is burning crap off the plugs, but surely there would be no oil build up at 5000rpm. The cylinders compression checked fine, and it doesn't use a drop of oil between changes. I changed the spark plugs and caps and my next was to change the leads to try an fix the problem. I am using the correct plugs. The gap is good. If it was a car I would use hotter plugs.

Re: 912 ignition wiring

by Garrett Wysocki » 9 years ago

Garrett Wysocki

1 572 1.45k

I changed mine at 390 TT including the plug caps. Was glad I did the rubber was hardened and chaffed. It was easy to do and eliminated a potential problem. I also found a good deal on the plug caps at Spark Plugs.com. As a side note I recently switched to the new 100LL SWIFT replacement and the engine runs noticeably better, especially in a decent with the power pulled back it used to vibrate in the 3000 to 4500 range that is pretty much gone now.