It is totally unnecessary to do anything to a fuel tank for a four stroke, not even for a YS engine, although some guys wrap them in shipping tape, I've never had a tank split or even leak with my YSs or my MDS 2.18 which pressurizes a tank harder than a YS does. If you want to fly pattern like and have an engine with lots of smooth steady torque, get a YS and you'll love it and you can position it any way you like and it will run the same.