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Author Topic:   Oil consumption on new 225 Yamaha
johnk posted 05-14-2001 11:10 PM ET (US)   Profile for johnk   Send Email to johnk  
I've got a new Yamaha OX66 225hp and it seems to go through alot of oil. I've got about 25 hours on the motor, and to date, the total numbers show an oil burn rate of almost 40-45 to 1.

Is that typical, will it get better, is it somehow adjustable?



lhg posted 05-14-2001 11:34 PM ET (US)     Profile for lhg    
Were you told to pre-mix the gas for the break-in, so you get double oil for the 1st ten hours? If not, it could be that the engine computer is pre-programed to do this automatically. I think the Merc Optimaxes work this way.
johnk posted 05-14-2001 11:55 PM ET (US)     Profile for johnk  Send Email to johnk     
Yep, the dealer also premixed the oil with the gas (at 50:1) for the break-in period. He said it was required on the OX66 motors, but not on the new HPDI's. Unfortunately the HPDI's max out at 200hp, just not enough for this application.

My calculation of 40-45:1 accounts only for the oil I have added to the oil tank. I ...thought... that under high-load situations it would regulate the oil/gas at 50:1, and under lower load conditions the ratio might be lower (perhaps 60-70:1).

I don't believe that the motor is smart enough to change the rate of oil delivery dependent on the number of hours on the motor, so my fear is that what I'm seeing is what I'm going to get.

thanks to all


Peter posted 05-15-2001 09:48 AM ET (US)     Profile for Peter  Send Email to Peter     

I too have a new Yamaha 225 OX66 with about 10 hours on it and it does seem to go through a lot of oil. I have heard (not from necessarily reliable sources) that during the break-in period that it is programmed to inject more oil. However, I too doubt whether it is actually equipped to do this. I have several friends that have had the same Yamaha engine for several years now and it has always been my impression that these engines use more oil per gallon of gas, at least as compared to my old 150 Johnson VRO (which for the 10 seasons I owned it had always worked perfectly well and consistently, by the way). I have been told that the difference in oil consumption is that the Yamaha outboards inject oil through the entire rpm range (idle to WOT) whereas the OMC VRO's do not begin to inject oil until the rpms reach 1500 to 2000.
I bought the Yami for several reasons, but one of the most important was that none of my friends have ever had a problem with one. If higher oil consumption equals fewer problems and no interuption to the boating season, I can live with the higher oil consumption.


HappyTime posted 05-15-2001 04:24 PM ET (US)     Profile for HappyTime  Send Email to HappyTime     
I think Yamaha as well as Fitch
are the same, the computer stores
the information that the motor has run, it keeps track of how many hours have been used, it stores the statistic infor such as the RPMs you ran and so on.
On the first 10 hours it controls double
oil ratio automatically.
A a mater of fact, when my service person hooked up the cable and read the information back from motor, he said 'You haven't
run your motor WOT yet' as he showed me
the statistic, then I replied
'That's right'.
The answer is yes, the motor is smart these
day, actually it's just a piece of CPU and software, maybe someday it will keep track of how many fish you caught ;-)

lhg posted 05-15-2001 07:39 PM ET (US)     Profile for lhg    
My observation is that the 2 stroke oil injected Yamahas are the LEAST smokey of any of the outboards. My Mercs have been called "bug foggers" by a Yamaha friend, and there is definitely a difference in smoke output! So it would seem they would use less oil once broken in. Who knows.
johnk posted 05-15-2001 08:17 PM ET (US)     Profile for johnk  Send Email to johnk     
I'd love to know whether the OX66 Yamaha actually regulates oil burn based on whether it's in 'break-in mode" or post break-in. I thought that Yamaha didn't regulate oil based on hours until the new HPDI motors were introduced.

I've always owned OMC and I've considered them moderate 'smokers'. My new 2001 OceanPro 90 HP Johnson was clearly less of a 'smoker'. This new 2001 225 Yahama smokes (much-much) more than I expected. A good friends Optimax smokes very very little ( was on his boat this afternoon) to the point where it's almost unusual to see any smoke.

Any certified Yamaha mechanics out there that could shed some light on the OX66?

as always, thanks


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