bmsgaffer 2,053 #1 Posted October 8, 2016 I have been mulling over this project since I acquired my 522 XI. Now that I made a big purchase for it, I am starting the project thread. Project 525 XI EFI... or 525 EXI? I am putting a 25HP electronic fuel injected brand new Kohler twin into my 522. While it may not hit the fuel economy of the diesel I have been after, it is supposed to be 25-30% more efficient than a carburetor engine of the same size and it will save me from having to maintain diesel tanks. Not to mention NO choke and flawless starting in any weather. All these twins from Kohler are practically drop in replacements for each other. I will have to do some wiring and modifications as this engine was originally designed for a different application. Different muffler, blower screeen, I am pretty excited, the motor should be here within a week. I will sell the CH22S that is in it, as it runs just fine, just needs to be cleaned up and have a few shroud screws replaced. I know that many of you will balk at all the electronics and say simpler is better, but since I am an electrical engineer I have to pursue the tech edge, its in my blood. I do have several other non-tech tractors to back this one up "just-in-case" but from what I hear I can expect 2-4000 hours with normal maintenance. As all projects do, this may take me a while as my garage time is often limited, but I really want this machine ready for plowing snow so I do have a goal! 9 Share this post Link to post Share on other sites
Jerry77 1,218 #2 Posted October 8, 2016 I'm drooling all over my keyboard........ Share this post Link to post Share on other sites
shallowwatersailor 3,214 #3 Posted October 8, 2016 (edited) Hopefully EFI for small engines has been perfected. Robin Subaru had a slew of problems on their singles about three years ago. Install the access panels for getting to the heads for cleaning. It probably still has the 100 hour maintenance requirement like the CH22. Edited October 8, 2016 by shallowwatersailor 2 Share this post Link to post Share on other sites
JERSEYHAWG / Glenn 4,499 #4 Posted October 8, 2016 If anything, it will be interesting to follow along. Best of luck. Glenn 2 Share this post Link to post Share on other sites
bmsgaffer 2,053 #5 Posted October 9, 2016 The zero turn guys have been running these EFI engines for about 10 years, and Kohler claims to have been on EFI small engines for 20 years now. From what I am reading, they are pretty reliable at this point, and I will find out first hand! 1 Share this post Link to post Share on other sites
