• This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.

Looking to piece my sea doo back togther from the winter, just need a few pointers.

Status
Not open for further replies.

alindley

Member
Hey I drove by the marina today and seen someone out there and said it was nice, so I wanna definitely get back out there.

But before I put my sea doo away for the winter, I'm pretty sure I only put gas into the tank, and no oil, but stabil.

Mine doesnt have oil injection, I use mixed gas, I was just wondering if I can now use this gas? or if its garbage? if i just put a bunch of oil in it, can I put in too much oil? will that cause any damage? ill just throw the gas out if i have to, but i would prefer to use it.

Do I just put it into the water, and try and turn it over? or is there steps to un-winterize it before I can try and run it?
 
Do you happen to remember about how many gallons you put in when you filled it up??? That is the thing about premix, I always make sure to put the oil in it when im at the gas station so i remember how much oil i need to put in
 
yea i dont have a clue it was months ago now.. like i could look at it and guess but i really have no clue what happened
 
Just to be on the safe side, siphon it out of the tank and burn small amounts in your car. Ethanol causes fuel to degrade quickly and absorbs moisture from the air.
 
yea i dont have a clue it was months ago now.. like i could look at it and guess but i really have no clue what happened

Be on the safe side and mix it to a 40:1 ratio for the full amount of gallons that your tank can hold, then fill it the rest of the way to full (probably a 15 gal tank if it is a RX) so 1.5 quarts of oil. Then worst case scenario, you are just a bit rich for the first tank.
 
Be on the safe side and mix it to a 40:1 ratio for the full amount of gallons that your tank can hold, then fill it the rest of the way to full (probably a 15 gal tank if it is a RX) so 1.5 quarts of oil. Then worst case scenario, you are just a bit rich for the first tank.

I am going to disagree here. Part of the fuel's job in a 2 stroke engine is to cool the piston crown, if there isn't enough fuel the engine can overheat and damage can occur.

Basically running too much oil can cause a lean condition. It is a bit conunter intuitive at first but lets say it takes 10ml of fuel mix for a combustion event. Our ideal ratio is say 50:1.

10 ml of fuel mix is brought into the combustion chamber (9.8 ml of fuel, 0.2ml of oil)- in this case there is enough fuel to be burnt and to cool the piston crown

Now lets assume you mixed the gas and oil last season at 50:1, but forgot and decided to mix it at 50:1 again. Now you have gas in the tank at 25:1.

So for this case the same 10 ml of fuel mix is metered by the carb into the combustion chamber (9.6 ml of fuel 0.4 ml of oil) this may not be enough fuel for the engine and could risk a lean condition and detonation.

Now the math above shows that it is only a SMALL fraction of a change in you fuel delivery, but on something like this it is quite easy to pump the old gas out and put some fresh fuel in.

Personally my old Seadoo gas gets siphoned into a tank and burned in my lawn mower.

Good luck!
 
Krispy - interesting point. Is this to say that adding additional oil during break-in is a bad idea?
 
Krispy - interesting point. Is this to say that adding additional oil during break-in is a bad idea?

This is only my opinion but I will share it. I like to run break in oil for the first tank of gas after a fresh rebuild. The main difference is that when you are doing break in usually you are at low throttle openings and low engine speeds and loads. At this point there is less risk
 
So your saying when you run your Seadoo alittle rich for precaution,(I add alittle oil to my gas first tank of season) that your actually running lean???? Not following you here
 
So your saying when you run your Seadoo alittle rich for precaution,(I add alittle oil to my gas first tank of season) that your actually running lean???? Not following you here

For this post: I refer to "gas" as in gasoline, and "fuel" is the gas oil mix some of us run in a premix setup. "oil" is just 2 stroke oil.

So traditionally RICH referred to the amount of fuel and air in the combustion chamber.

RICH meant more "gas" in the air fuel mix , Lean meant less "gas" in the air fuel mix.

So if you run with excess oil in the fuel, per given volume the fuel contains less actual "gas" and more oil.

Hince running lean.
 
i'm not a huge fan of running really old gas, especially if your questioning the oil content as well.

if it was me, i'd be siphoning it out... but i'd rather error on the side of caution.

if you have a rider lawn mower, that would be the place i'd put it... and start out fresh...
 
This is only my opinion but I will share it. I like to run break in oil for the first tank of gas after a fresh rebuild. The main difference is that when you are doing break in usually you are at low throttle openings and low engine speeds and loads. At this point there is less risk

Good point - that makes sense to me. Thank you. I may use a bit less "added oil to the gas" as time goes on during the break-in period (which is when one hits it a bit harder as compared to the beginning).
 
Last edited by a moderator:
i'm not a huge fan of running really old gas, especially if your questioning the oil content as well.

if it was me, i'd be siphoning it out... but i'd rather error on the side of caution.

if you have a rider lawn mower, that would be the place i'd put it... and start out fresh...

Agreed. Particularly if you do not know if the old gas was an ethanol blend, which will separate and absorb moisture much quicker than non-ethanol gas.
 
I pumped the old gas out of both my XP's this weekend before filling them up with fresh new 91. Piece of cake and no bullshit to worry about.
 
Status
Not open for further replies.
Back
Top