morini=ktm50.
try the pipes from ktm-50's...proper FMF racing pipes made for the engine specifically, tested, tweaked, tested, then finally manufactured. not just a basic stamp made in china to spit them out by the millions regardless of whether they work or not.
it would be the only thing a morini deserves...the correct pipe for it. why go cheap on the important bits if you bought a REAL engine for a change?
if its air cooled, rubber tube between the fins...
if its liquid cooled...just revel in the joyous sound of a real two stroke engine making real power...