In spite of every thing I could do to screw up this engine, it is still running like a top.
I found some kind of goo that had gotten into the tanks and was plugging up the fuel supply just enough to let it run, but not let fuel flow free enough for full throttle operations.
Pulled all the lines and filters and replaced/cleaned them all.
All seems well now. The coolant temps are now down to 200 210 deg. With that cowl you gave me.
The wiring block made all the rough running leave the engine. It purrs like a kitten now.
I think that now we can start to enjoy the plane. Just in time for the second half of summer

Views: 366


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

Join Zenith Aircraft Builders and Flyers

Comment by Mark Maltais on July 6, 2012 at 9:50am

I was REALLY interested in this engine (still am) until I found an O-235 with too good a price to pass up!  Glad to hear it's holding up so well and I may still get one a few years from now. 

The liquid cooling is one of the features that I like, in fact a guy here was doing circuits in 35C weather a few days ago when his engine started running rough...turned out he blew two jugs on his engine! :(   Not a common occurrence but still happens...and expensive to boot!

New from Zenith:

Zenith Planes For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...

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, Dynon and Garmin avionics, and more.

Zenith Homecoming Tee:

Zenair Floats

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

Builder & Pilot Supplies:

Aircraft Insurance:


West Coast USA:

Pro Builder Assistance:


Transition training:

Lavion Aero

K&S Aviation Services

Aircraft Spruce & Specialty for all your building and 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.

© 2024   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service