I have according to my reseller a B321, that only lasted 1 gallon of fuel, i had it run in by the assiastance from another reseller that also compete, so he knows what he doing, and the engine only cost about $330, but i thought that Orion would last longer than 1 gallon, used for racing at 1 event, and before that only training, always run in around 120degrees C, and always with good fuel, clean airfilter, looked after good, used afterrun oil from mugen seiki, and fuel from Team Strike 25%, is this normal for Orion engines, if so i will move to other brand, none can be this bad.