F115

[xpress 115]

I have a 2007 f 115 with 15 hours on it I just checke the oil and there was gas in the oil. What could be the cause of this?
THANKS

[PSM207]

Does the oil just have a fuel odor, or is the oil thinned out due to a large amount of fuel?

[BBG Marine Electronics]

First , you should have changed the oil @ the 10 hour mark (per manual) if I'm not mistaken. Maybe you already have...

If you will do a google search on something like "F115 making oil" you will see that the problem has been inherent with the 4 stroke Yamaha's , especially the F115. The problem is the rings aren't seating yet. Yamaha tech's will tell you to run the engine much harder and get those rpms up. It will seat the rings properly and stop the gas from reaching the crankcase. I have also read that you should only fill with oil up to the half-way full mark on the dipstick to allow for some increase of liquid in the case.

I did a ton of research on it after I bought my current rig and found out what was causing it. I too noticed the level on the dipstick seemed to be rising.
My engine had 38 hours on it when I purchased my boat and the owner broke the motor in by trolling for crappie..LOL

The harder I run the motor the better it seems to perform so Don't baby it !!!

They are great little engines..hope you enjoy yours

[xpress 115]

Yes I had the oil changed at 10 hours. The dealer changed it.

[dirtmonkey]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by angler557 &raquo;</TD></TR><TR><TD CLASS="quote">First , you should have changed the oil @ the 10 hour mark (per manual) if I'm not mistaken. Maybe you already have...

If you will do a google search on something like "F115 making oil" you will see that the problem has been inherent with the 4 stroke Yamaha's , especially the F115. The problem is the rings aren't seating yet. Yamaha tech's will tell you to run the engine much harder and get those rpms up. It will seat the rings properly and stop the gas from reaching the crankcase. I have also read that you should only fill with oil up to the half-way full mark on the dipstick to allow for some increase of liquid in the case.

I did a ton of research on it after I bought my current rig and found out what was causing it. I too noticed the level on the dipstick seemed to be rising.
My engine had 38 hours on it when I purchased my boat and the owner broke the motor in by trolling for crappie..LOL

The harder I run the motor the better it seems to perform so Don't baby it !!!

They are great little engines..hope you enjoy yours </TD></TR></TABLE>

He's telling you right... mine did the same thing (05). Just fill it up half way and run it like you stole it, per Yamaha Corp. Technical Srvice rep. I talked to at the FLW Championship last year... It'll do it a couple more times until the rings seat. Very important to get the temp up, especially if you do a lot of idling. After cranking let it idle for a bit (like while you go park the trailer), then run it like hell til it gets good and warm. Long WOT runs are what tis engine needs to get the rings seated afte the initial babying... you can tell when they get seated, you won't see nearly as much (fuel) contamination in the oil if any...