i have a 115 yamaha 2004 h

my 115 2004year makes oil a quart every 25 hours,can some one tell why, an what i can do??

Try searching F115 Making Oil on Google. It is a well known problem and there are several possible causes. The main one is that the rings are not properly seated and you are getting fuel in your oil if I remember properly. I think there may be a Yamaha service bulletin about using a different thermostat or similar. Others I think have had success by running the engine hard for a period. Only strange thing is that on 1 2004 engine I would have thought you would have had this problem when it was newer rather than now, The F115 can also get water in the oil from issues with the lower oil seal around the oil pump. Less common I think, but another casualty of Yamaha's wonderful F series oil pump seal design.