Hello, I have a 4* 40 and I want to use a 4 stroke. I currently have all 2 strokes. 2 O.S .40s, 1 MDS 40, and 1 supertigre 40. All run great and start on the electric starter immediantly. How hard is it to maintain a 4 stroke? Are they reliable. How hard are they to work on? I am looking at the Saito .40-.50, O.S FS-52, and the magnum XL-52rfs. Thank you for your input and for the help as I dont know much about 4 strokes.