I changed the stopper system with an own system, since the days of methanol I have a life long hate with these units, the sooner or later they start to leak and are cumbersome to install. In this thread at page
http://www.rcuniverse.com/forum/rc-j...l#post12150915 You will find the details. Till now not a single drop leaked.
Somewhere in the thread I too advised the Xcal could do with a smaller tank, 5,5 litres, even with an 160 is overkill, I normally tank it till about one litre below full and I still end up with 1/4 or 1/3 left. OK, I am not one of the pilots that fly continuous full throttle till in the circuit for landing...