hey guys ...i just got a new Evolution .90...runs fine for a bit then at half throttle it starts dieyng...wants to quit...put to full throttle and it seems as if it gets hot and starts to lock up...blue paint on head turnming brown so im thinking it is getting way to hot....running omega 15% fuel with castor synthetic mix...acti it did lock up on i think Byron fuel th omega is 4 stroke fuel.,,, any suggestions or thoughts???