But the OS .90 IS a .91, with the weight of a .61......and they start SO easy, and idle SO nice!
I've had many gallons of fuel through my 4Star 60, never had any complaints or problems with the tank or stopper. Maybe they've made a change in the last year???? Mine is an ARF...........
I would advise going to a fiberglass landing gear, as well as a better quality tail wheel assembly than what comes with them.