i got valve problem with my yz250f year 2007,anybody know that the strength of the original valve or i need to order the another titanium valve,OEM original part is good or no?how long i can used that valve,actualy i only used my bike for trail only,not for racing,i just want to reduce the maintainance.anybody can sugested to me what can i do with my bike for trail used with longger time and can hold for the long time.how to ride this bike during trail.tq so much.