Has anyone had any experience with a Franklin engine on a Stol 750? Are there motor mounts available and other parts? Model looking at is 4A-235 125 HP. Lawrence Anderson

Views: 454

Reply to This

Replies to This Discussion


Am building a 750 and have installed a 90 hp Franklin. One of the 125 Franklins has the "same" or similar mounting pattern as an O-200 Continental. Zenith's O-200 mount may work if you have the right 125. Hope you are successful, since I would like to see more Franklins.

Les Hicks

I just saw this video from a few days ago:

Seems like Franklin is back in business again!

The guy says that their Franklin 235 would be a drop in replacement for an O-200 with a similar weight but 125 hp.

Pretty exciting, I like the engine's long track record, heard many good things about the Franklin engines and will certainly keep an eye on them. I really hope that the entire O-200 firewall forward kit is compatible with the Franklin.

Just noticed this thread. I just noticed this thread.  I fly behind a 4A-235-B31 since Sept 2016.   While the mount points spacing is the same as the Continental O-200, i am not sure it will fit well with a stock O-200 mount for the CH-601.

the B31 version with the spider manifold and deep oil tank use a lot of space vertically.  I fabricated a mount bringing the engine as high as possible,  seems the height of the prop flange relative to the mount is not the same as that of the o-200 also.

for the cowling, the stock o-200 cowling general shape is prettty good but a lot of additional work was needed (as I am not good with Fiberglass and I hate working that material  I spent 50 hours adapting the cowling I bought).   There are the modifications I needed to do:

- change the shape on the top to clear the upper engine mount points and the starter.

- reposition the carb air intake hole as it was too high

- extend the bottom of the cowling by over 2 inches to clear the carb heat box and oil pan.

My engine now works pretty well,  but it would be a lie to say it is a simple bolt on replacement for an o-200.


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 HomebuiltHELP.com

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 HomebuiltHelp.com 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