50:1 or 100:1 for 2 stroke 30hp Yamaha

[barrabart]

G'day all,

I was running fuel oil mix at 50:1, the second last time i went out i trolled back to the ramp for about 1/2 an hour, when home cleaning the boat i noticed black oil residue had dripped from above the prop down onto the prop. I spoke to the Yammie mechanic and he told me to start mixing at 100:1, which i'm now doing.... Just interested to know what all you blokes run your Yammies at, the mech told me i could do more motor damage running 50:1 then 100:1.
The motor is a well looked after and not overly used 2000 model 2 stroke 3 cyl 30hp.
Interested to know your opinion????

[RTFM1000]

G'day all,

I was running fuel oil mix at 50:1, the second last time i went out i trolled back to the ramp for about 1/2 an hour, when home cleaning the boat i noticed black oil residue had dripped from above the prop down onto the prop. I spoke to the Yammie mechanic and he told me to start mixing at 100:1, which i'm now doing.... Just interested to know what all you blokes run your Yammies at, the mech told me i could do more motor damage running 50:1 then 100:1.
The motor is a well looked after and not overly used 2000 model 2 stroke 3 cyl 30hp.
Interested to know your opinion????

Definately 100:1
All Yamaha 2 stroke up to 40hp are 100:1

Regards, RTFM1000

[Kondo 1]

Hi Mate,

I just did a search on the Yamaha site for an owners manual of your motor - if I found the right one it does say 100:1.

I did hear a while back that the 100:1 was merely done in the smaller motors for emissions... not sure how true that is though. As a part of that it was suggested that 50:1 gave you far greater protection if the motor got hot due to a blockage or similar.

I run my 50 on 50:1 - the manual does state that figure, it is a little smokey when trolling or doing your 6 knots but despite long periods of both I have never had any problems with the motor oiling up or getting difficult. Not even a little cough...

If I could make a suggestion, I use more premium oils, Penrite or Yamalube and more recently BD50 which is awesome for smoke reduction. If it were me I would probably run 50:1 with a better quality oil to reduce smoke and carbon buildup.


Cheers.

[Axl]

Mate I have owned 2 yammies 1st was a 25hp 2001 model 2nd was a 50 hp 2007 model.

Ran them both at 50:1 (after recomended run in period) did not have a problem the worst you can do is oil up the plugs which in modern engines dosent pose a huge problem from my expierience.

I am not a mechanic by any means but as far as I know too much oil wont hurt unless you are running evryday.

[marty+jojo]

I have a 2003 40HP Yamaha 3 cylinder, I bought it new and after the run in stage I have always ran it at 50:1 Yamalube, 7 years and no problems.
Marty.

[whatscracken]

100:1 mate.

[MyEscape]

What does the manual state? Why would you run it at anything different to what the manufacturer suggests?

Steve

[banksmister]

Dealer told me
100:1 with yammie oil
50:1 any other brand
Said this is to cover there bums on low spec oils

[robersl]

i have a 40 hp 3 cy 2008 2 stroke book says 50-1 only

shane

[billfisher]

I run my Suzuki 30hp at 50:1 even though the manual states 100:1. The trouble with these and similar motors is that they don't get enough oil near full throttle with 100:1. So if you want you motor to last a long time without a rebuild then I'd use 50:1 - you won't notice any ill effects by the way.

[rcfisher]

have been running mine at 50-1 just changed back to 100-1 caught out where i cant start the motor put it down to oil on the plugs no mechanic but thats my guess

[FNQCairns]

Split the difference on the 100:1 models and go 75:1 but use a known good oil.

cheers fnq

[Spaniard_King]

If you want to run 50:1 simply get your engine tunned to run on the mixture you want to use, The problem maybe finding a decent mechanic who can do this for you :P

As Billfisher has mentioned the issue will be enough oiling for heavy loads and higher use RPM

[Steboe]

Definitely 50:1

[barrabart]

Well from those mixed responses it goes to show that both mixes are not overly harmful....... So my thoughts are i'll keep using the Yammie Oil mixed at 100:1 as the Yammie mechanic told me, this was my plan anyway, but was just interested to see what the rest of you guys did...... On the last trip out i did enjoy the smoke free air when trolling..... even if i didn't land anything, though did sound up a couple of holes to spend some time at next trip.
Thanks for the replies.

[stevej]

im doing a compromise 75:1 but i run around at full tit all the time

my theory is its just a marketing ploy by yamaha to cut emissions and make its self stand out no other brand says 100:1 whys that ?

[oldboot]

Consider that many post mixing outboards run 50:1 ans the richest mix at idle and lean out to 70:1 or leaner at full throttle, running 100:1 in a modern engine with a modern oil does not sound inreasonable.
The newer oild will seperate in the crankcase and stick to the walls better then and older technology oil.
Running75:1 with a modern oil sounds reasonable
cheers