My Rotax 912ULS has been using oil since new.  Lockwood Aviation tells me this is not normal. I experienced reduced RPM on takeoff July 4 and had to return for landing. my first since returning from the June 22 Zenith Fly-in at the factory.  #1 cylinder has low compression and badly oil-fouled plugs. I have only one year and 68 hours operation on the engine.  ASB 912-062 applies only to cylinders 2 and 3 and not to my serial number. Anyone experience a similar problem out there?

Views: 465


You need to be a member of Zenith Aircraft Builders and Flyers to add comments!

Join Zenith Aircraft Builders and Flyers

Comment by Don Herbel on July 14, 2013 at 7:50pm

Carbs were no longer synced. Right side running rich and one plug in #1 cylinder showed damage from detonation, its gap was closed and other plug was fouled.  New plugs and a check of compression showed normal readings again.  Full power returned after synchronization.  Will keep eye on oil consumption.

Comment by Bob McDonald on July 10, 2013 at 4:21pm
It will be a very unusual to have a Rotax 912 using oil. Let me know how you make out.
Comment by Don Herbel on July 10, 2013 at 7:28am
Thanks for the input, Bob. I checked engine oil level hot after 2.8 hour flight to Mexico, Mo. and again at fuel stop in Bolivar, Mo. and finally back home on return flight (total return flight 5 hours) and the oil level had dropped from the full mark to the fill mark. Local Rotax rep is coming next week. Lockwood in FL. says I need to pull the cylinder, compression check is 40/80 and air can be heard escaping into the oil tank and out the exhaust valve.
Comment by Bob McDonald on July 9, 2013 at 5:23pm
Call Bob Robertson at Light Engine Services in Salmon Arm, B.C.
He is my go to ROTAX guy. 250-832-8786. He works directly with Kodiak Research The distributor for Rotax in North America.

New from Zenith:

Weather Maps

Custom Instrument Panels
for your Zenith

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.

New Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits

New Zenith Apparel from EAA:

Zenair Floats

Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz.

Builder & Pilot Supplies:

How to videos from

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit for the latest DVD titles.


Zenith transition and Sport Pilot training:

Quality Sport Planes
Cloverdale, California:

Wheels & Wings

Pro Builder Assistance

© 2018   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service