.Maybe it's just me but on the motors with the removable front housings like the OS FSR's. How in the heck does simply rotating the front housing AKA .(carb mount and bearing holder) 90 degrees toward the exhaust port , make the motor run in reverse? You can only do that on 2 strokes by changing the port timing and by rotating the front housing , your not doing anything but changing the carb orientation! And according to OS this is a quote from their home page " No, OS does not produce an engine with a counter rotating crankshaft. Until 2 years ago we stocked a reverse camshaft for the smaller OS four strokes to allow you to do this, but these are no longer available either. A standard engine cannot simply be 'reversed' in any means. However, you could go to a gear reduction system for both your engines with the reverse direction engine having one more or one less gear in the gear train. However, we are not aware of anyone who makes a product specifically for this task." but maybe it is just me.