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I put a small amount of oil in the gas tank of my jet ski.

Tiny
TEHBOMBSQUAD
  • MEMBER
  • 1998 ALL OTHER MAKES RECREATIONAL VEHICLES
  • 100 MILES
I put about 6-8 oz of marine 2-stroke oil in the gas tank of my 1998 sea-doo GS. The tank had about 8 gallons of gas in it. The engine is a 718cc 2-stroke motor. I have not run the ski yet and the oil is only in the tank. I don't want to drain the whole tank, but I will if I must. Would it be OK to run the engine with the oil in the tank because it is a 2-stroke? If not, what is the best option.
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Monday, June 11th, 2012 AT 7:16 PM

12 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Yes you have to mix oil in the gas for a two stroke or you will damage the engine.I perfer to mix the oil in the gas can so I can shake the can good for a good mix. Also that model doesnt have a oil injection pump where you add oil to a seperate tank from the gas?Also what is the oil ratio supposed to be for that model?
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Monday, June 11th, 2012 AT 7:21 PM
Tiny
SATURNTECH9
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Also you said you out 6-8 ozs of oil in the gas you should always know exactly how much oil you mixed in the gas with a two stroke engine. What kind of oil did you use?
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Monday, June 11th, 2012 AT 7:24 PM
Tiny
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You add the gas and oil separately. Its mixes the oil and gas before it is injected. The gas tank is not supposed to have any oil in it, but I was not paying attention and the caps are the exact same (apart from the little logo) and on the same spot on opposite sides of the ski.
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Monday, June 11th, 2012 AT 7:26 PM
Tiny
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The image I provided shows the oil filler cap side. You can see it just behind the "hood" portion which is purple. I filled the wrong side (the gas side)
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Monday, June 11th, 2012 AT 7:28 PM
Tiny
SATURNTECH9
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The oil ratio will be a lot higher putting oil in the tank it could foul plugs run like crap etc.
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Monday, June 11th, 2012 AT 7:34 PM
Tiny
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Also, the engine is supposed to have a 50:1 gas to oil ratio. The oil is a tc-w3 (non-synthetic, I think) 2-stroke marine oil.
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Monday, June 11th, 2012 AT 7:36 PM
Tiny
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As long as it does not cause permanent damage, and will run fine once the oil is out of the tank, I will be fine. If not I will siphon it.
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Monday, June 11th, 2012 AT 7:38 PM
Tiny
WRENCHTECH
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It's really no big deal. Just dilute it as much as possible with more fuel. It may smoke a little but won't hurt anything.
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Monday, June 11th, 2012 AT 7:38 PM
Tiny
KHLOW2008
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This is not going to damage the engine except for some additional pollution (excessive smoke) that it is going to send out. Apart from that, there is nothing to worry about.
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Monday, June 11th, 2012 AT 7:40 PM
Tiny
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Ok, I knew it would smoke, but I can fill up the tank and run it for awhile. Thank you both for the help.
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Monday, June 11th, 2012 AT 7:41 PM
Tiny
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Or thank you all three now.
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Monday, June 11th, 2012 AT 7:41 PM
Tiny
SATURNTECH9
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Yeah instead of running 50:1 it will be running around 25-30:1
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Monday, June 11th, 2012 AT 8:06 PM

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