ORIGINAL: William Robison
Reza:
If you start with a factory new FA-91 engine it's a simple matter to replace the cam shaft and get the counter rotation. If the engine has some time on it the tappets and valve springs should also be replaced.
In any event, reversing a Saito single is trivial. I've done several.
Something you might consider, if the plane is big enough to use the FA-120 engines they are even simpler to reverse, and you end up with symmetric engines - both cylinders can be on the inside of the nacelles (pointing toward the fuselage) and still have the exhaust coming out the bottom. The FA-120 is the only one of the Saito singles that will allow this.
Bill.
Can the Saito 100 be reversed as easily, and where are you getting the cam shafts? Thanks.