So for school I’m working on an RV-12 (don’t worry, my 601HDS wings and tail still get worked on in my garage). We are getting close to engine start, and we installed the engine controls last night. However, I noticed no mixture control! I did some looking around and this does seem to be the case. I should point out that this is NOT the 912iS, but the dual carb version. 

I have ave always planned to put this engine on my bird, so I’m curious what everyones experience with this is. Do you like it? Do you wish you had more control? How’s the fuel burn and temperatures? 

Views: 167

Reply to This

Replies to This Discussion

My HDS has a 912ULS installed.  So far (500hrs running mogas) I've been pleased.  Nice and simple no mixture control.  At 5K rpm 4.3 gph, 5.3K rpm 5.0 fph, 5.5K rpm 5.4 gph.  This at about 2500 MSL.

Scott, I have flown many hours on LSA with Rotax 912ULS installed and landed on airfields elevated higher than 7000 ft AMSL. The automatic mixture control, that controls the two carburettors, works great. The only important thing is to really setup the engine correctly (mainly the balancing of the two carbs); you will find instructions on flyrotax-website (or on different good other internet websites). The 912ULS burns something like 4-5 USG/h and is very efficient. Have fun with the engine!


New from Zenith:

Zenith Planes For Sale 

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


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.

Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits

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.

Aircraft Insurance:


West Coast USA:

Pro Builder Assistance:


Transition training:

Golden Eagle Aviation

Pianosa Flying Farm

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2020   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service