I have about ten airplanes, from 4 stroke cubs to 50cc gasser's. My favorite is my 40 size Stik with an os46 ax. I have the same plane with a 55 ax but it flies heavier. True the 55 has more power, but the extra weight does make a difference in the way it flies. What I have learned is proper break in is key for a liner to last. I throw out the OS instructions and do what JETT recommends. That along with some Sig castor in the fuel makes a big difference. I fly most every day and I fly hard. I believe that OS makes a good product but they can be a bit pricey at times. And I use Marvel Mystery Oil for a good after run oil.
