Yamaha 2-stroke motor oil mix question

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Yamaha 2-stroke motor oil mix question

Postby 2takem » Mon Oct 07, 2013 11:59 am

Ok guys. I bought my first boat recently and when I bought the boat the gentleman said to mix 50:1. However, on the side of the motor it stats 100:1 and so does the book. Now, to me I should use the 100:1 as the book and motor states.

Am I missing something? Is there a reason he was using 50:1?
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Re: Yamaha 2-stroke motor oil mix question

Postby 2takem » Mon Oct 07, 2013 12:52 pm

Should note its a 25hp 2-stroke Yamaha.
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Re: Yamaha 2-stroke motor oil mix question

Postby 12gauge05 » Mon Oct 07, 2013 1:05 pm

I recommend running 50:1 in my personal experience the motors tend to last longer just my opinion and if the guy before you ran that then the motor is used to it if you change it now it could possibly turn into a headache
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Re: Yamaha 2-stroke motor oil mix question

Postby Boatman » Mon Oct 07, 2013 3:25 pm

Most motors that recommend 100-1 oil mixture use the special roller bearings that are silver coated. In that case you can run 100-1. However if you plan on running it full throttle a lot I would mix a little richer.
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Re: Yamaha 2-stroke motor oil mix question

Postby z51 » Mon Oct 07, 2013 3:26 pm

I've been running mine on 100:1 for 4 years now. Do what the manufacturer recommends which is 50:1 during break in and 100:1 from then on. You will have cleaner plugs, pollute less, and cost less per tank. Some people are just slow to change their ways.
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Re: Yamaha 2-stroke motor oil mix question

Postby mudpack » Mon Oct 07, 2013 4:29 pm

2takem wrote:Ok guys. I bought my first boat recently and when I bought the boat the gentleman said to mix 50:1. However, on the side of the motor it stats 100:1 and so does the book. Now, to me I should use the 100:1 as the book and motor states.


No, the previous owner knows far more about two-stroke engines, and this engine in particular, than Yamaha ever will.
:rolleyes:
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Re: Yamaha 2-stroke motor oil mix question

Postby shoveler_shooter » Mon Oct 07, 2013 5:50 pm

2takem wrote:Ok guys. I bought my first boat recently and when I bought the boat the gentleman said to mix 50:1. However, on the side of the motor it stats 100:1 and so does the book. Now, to me I should use the 100:1 as the book and motor states.

Am I missing something? Is there a reason he was using 50:1?

I have the same outboard, 1999 model. Been mixing 100:1 (which is manufacturer recommended like you said) for the last 10 years with no issues. If I mix mine on the heavy side at all, a nice cloud of exhaust fumes will be coming out. I can't even imagine what 50:1 would look like...probably a crop duster on the lake.
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Re: Yamaha 2-stroke motor oil mix question

Postby lattehead » Tue Oct 08, 2013 4:49 pm

1
Last edited by lattehead on Mon Jul 28, 2014 5:10 pm, edited 1 time in total.
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Re: Yamaha 2-stroke motor oil mix question

Postby 2takem » Tue Oct 08, 2013 8:54 pm

Thanks everyone!
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