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Yamaha 225 2005 fuel in oil

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fat_cat

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I have twin yamaha 225 fourstr

I have twin yamaha 225 fourstrokes and they are both alternatively getting gas into the oil "makin oil" is the term my mechanic used. I will change the oil and they run fine for a could trips then all of a sudden one or the other starts making oil. What is the problem and how do I solve this?
 
My motor (F115) did th

My motor (F115) did the same thing. I replaced my thermostat and it stopped. If the motor is not heating up then it will keep pumping fuel to make it do so. Try checking your thermostats to see if they are working properly.
 
"Thanks but I recently replace

"Thanks but I recently replaced all the thermostats..

I suspect it has to do with bad fuel, perhaps too much alcohal in the fuel? and is drying my rings causing the leak of the fuel to the oil.... any ideas?"
 
i have faced the same problem

i have faced the same problem many time with f200 and it due to low quality of fuel... so every time i clear up the fuel tank and some time this problem causes the oil pressure sensor failure....
 
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