Update, my 2005 F115 was doing this so I rebuilt the fuel pump and changed the thermostat and it’s fixed now, if the motor can’t get up to temp it can’t burn off the fuel correctly and will dilute your oil.
The low-pressure fuel pump for F115A is driven by the camshaft, so if anything is damaged to the pump seals or gasket it will happen like this. Just order all new seals and gaskets, replace them and you should be good to go.
One question I have been sherching for some one to explaine my why dose my Yamaha 250moter oil elevate the motet oil level do you why it is happening please
all yall talking about "making oil" don't understand what this guy is talking about. this happened to me today, and buddy, that oil/gas solution shot out the dip stick tube 4 inches. time to order rebuild kit for the low pressure pump!
Okay so I have spent lots of time researching this MAKING OIL ISSUE and the primary culprit is this poorly designed fuel pump that is used on both Yamaha and Merc 4 stroke machines. (Alcohol breaks down the diaphragm of the pump and allows fuel to pass thru the diaphragm) If you have a primer bulb, pull the fuel pump off and squeeze the bulb and if fuel flows out when the pump is off the motor and away from the engine, then it is the fuel pump replace it with the cheap one from ebay or communist outfit Amazon....however if it is not the fuel pump then apparently there is a vac hose that sucks oil into the crankcase that runs thru a chamber that has oil in it can't remember exactly where it does this but it is traceable. Finally another source is the pressure regulator...that can stick and do it as well. Other reasons could be a poor break in period so rings did NOT seat before use of synthetic oils which prevent rings from seating properly...fix is to drain sythetic oil and put dino oil in and do a fast idle for a few hours to properly seat the rings...then replace with synthetic again. If the oil raises very slowly, it could be building oil because the engine does NOT get hot enough to burn it off, and that fix is a slightly hotter thermostat...this happens particularly if the motor never gets very warm...short runs etc.
Update, my 2005 F115 was doing this so I rebuilt the fuel pump and changed the thermostat and it’s fixed now, if the motor can’t get up to temp it can’t burn off the fuel correctly and will dilute your oil.
The low-pressure fuel pump for F115A is driven by the camshaft, so if anything is damaged to the pump seals or gasket it will happen like this. Just order all new seals and gaskets, replace them and you should be good to go.
Making oil best way to notice this is happening is to fill oil just below full mark if it ever gets to full mark you know you have fuel in oil.
Thank you for sharing, have same problem with my engine,almost to the t.
U selling that engine
My 2005 F115 is doing this, I ordered a new diaphragm to rebuild the pump, hopefully that fixes it 🤙🏼
One question I have been sherching for some one to explaine my why dose my Yamaha 250moter oil elevate the motet oil level do you why it is happening please
Your engine SN shows its a 2016. Last 2 digits show 16, thus 2016.
Idling a lot and cold water idling cause this
Thank you for the video. Where did you buy the new pump? Yamaha pumps cost more than $100. Thank you.
all yall talking about "making oil" don't understand what this guy is talking about. this happened to me today, and buddy, that oil/gas solution shot out the dip stick tube 4 inches. time to order rebuild kit for the low pressure pump!
저도 같은 현상을 경험할 수 있을것 같아요. 많은 도움이 되었습니다.
There is a diaphragm only that can be purchase rather that the entire pump. Easy peasy to replace. Yamaha is telling customers that
How long has that Amazon pump last?
Okay so I have spent lots of time researching this MAKING OIL ISSUE and the primary culprit is this poorly designed fuel pump that is used on both Yamaha and Merc 4 stroke machines. (Alcohol breaks down the diaphragm of the pump and allows fuel to pass thru the diaphragm) If you have a primer bulb, pull the fuel pump off and squeeze the bulb and if fuel flows out when the pump is off the motor and away from the engine, then it is the fuel pump replace it with the cheap one from ebay or communist outfit Amazon....however if it is not the fuel pump then apparently there is a vac hose that sucks oil into the crankcase that runs thru a chamber that has oil in it can't remember exactly where it does this but it is traceable. Finally another source is the pressure regulator...that can stick and do it as well. Other reasons could be a poor break in period so rings did NOT seat before use of synthetic oils which prevent rings from seating properly...fix is to drain sythetic oil and put dino oil in and do a fast idle for a few hours to properly seat the rings...then replace with synthetic again. If the oil raises very slowly, it could be building oil because the engine does NOT get hot enough to burn it off, and that fix is a slightly hotter thermostat...this happens particularly if the motor never gets very warm...short runs etc.
Halloween. Fellow can explain me the color of the oil mix with fuel???