Recommended oil mix ratio - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts
 
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post #1 of 6 (permalink) Old 08-11-2011, 02:06 PM Thread Starter
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Recommended oil mix ratio

Hello,

I bought a 1993 SC 650. I have read that I should block off the oil pump and pre mix the fuel because the pumps are known to fail. What ratio do I mix the fuel?
Thanks.
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post #2 of 6 (permalink) Old 08-11-2011, 03:05 PM
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Exclamation Don't convert to premix

Quote:
Originally Posted by ksmailes View Post
Hello,

I bought a 1993 SC 650. I have read that I should block off the oil pump and pre mix the fuel because the pumps are known to fail. What ratio do I mix the fuel?
Thanks.
I don't know where you read oil pumps fail, but that is a bunch of BS, the oil lines are what fails not the pumps. And they fail due to age or neglect, Loose or cracking lines are to be expected and mantained. Reason being the oil injection isn't just pumping oil in the fuel, it is metering it at the right ratios for the right rpms which could be any from 100:1 at idle and 50:1 at WOT, and any where in between.

So if you pre-mix not only are you going back to the seventies in technology, but you are at 50:1 ALL THE TIME. Which will cause fouled plugs at idle speed, harder to start, produce smoke and pollution, waste oil, foul your carbs and have to lug oil around. I never stop shaking my head at people who just yank out their oil injection before understanding what the problem is and correct it. But to answer your question 50:1 is the premix ratio for most two strokes.

I have owned about 20 or oil injection systems going back to 1980. Not one has ever failed. The majority of them were on Skidoo snowmobiles and operated perfectly in sub zero weather


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post #3 of 6 (permalink) Old 08-11-2011, 03:25 PM Thread Starter
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Oil pre mix

Hello,

Thanks for your input. I have read in several forums about the oil pumps failing without warning causing a lean fuel condition and in turn burning the engine up. I am new to the oil injected engines the last jet ski I owned was Kawasaki js440 when I lived in Hawaii. That one I had to pre mix. I never said I was going to "yank" my oil injection system out, but only inquired as to the pre mix ratio if I were to decide to do so. Your experience with never having a problem with the oil injection systems in skidoo snowmobiles does not nessesarily equate to a Kawasaki jet ski.
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post #4 of 6 (permalink) Old 08-11-2011, 03:52 PM
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Quote:
Originally Posted by ksmailes View Post
Hello,

Thanks for your input. I have read in several forums about the oil pumps failing without warning causing a lean fuel condition and in turn burning the engine up. I am new to the oil injected engines the last jet ski I owned was Kawasaki js440 when I lived in Hawaii. That one I had to pre mix. I never said I was going to "yank" my oil injection system out, but only inquired as to the pre mix ratio if I were to decide to do so. Your experience with never having a problem with the oil injection systems in skidoo snowmobiles does not nessesarily equate to a Kawasaki jet ski.

What Kawasaki do you have? Also what forum did you read that oil pumps fail? He is right, in 99% of oil injection failures it is the lines that crack or come off not the actual oil pumps. Did you know that oil pumps are designed so that of they do fail they go into wide open mode and flood your engine with oil rather than seize it?


Pre mix is not fool proof either. What if you're hung over one day short the ratio or borrow it to a friend and he puts straight gas in?
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post #5 of 6 (permalink) Old 08-11-2011, 04:55 PM
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Quote:
Originally Posted by ksmailes View Post
Hello,

Thanks for your input. I have read in several forums about the oil pumps failing without warning causing a lean fuel condition and in turn burning the engine up. I am new to the oil injected engines the last jet ski I owned was Kawasaki js440 when I lived in Hawaii. That one I had to pre mix. I never said I was going to "yank" my oil injection system out, but only inquired as to the pre mix ratio if I were to decide to do so. Your experience with never having a problem with the oil injection systems in skidoo snowmobiles does not nessesarily equate to a Kawasaki jet ski.
Ok there is no lean condition when oil is not fed into the motor, lean has to do with air/fuel mixture, not lubrication, the amount of fuel is the same either way, what does change is no lubrication for the engine which is not a lean condition. So you are saying that Skidoo builds better oil injection systems when you compare it to Kawasakis?

Good Luck...your the asking the questions we are just answering them. I see Yamadoo agrees with me also, as will others.


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post #6 of 6 (permalink) Old 08-11-2011, 11:34 PM
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Quote:
Originally Posted by ksmailes View Post
Hello,

I bought a 1993 SC 650. What ratio do I mix the fuel?
Thanks.
50:1 for stock Kaw engines.

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