Wrong grade oil by previous owner...

[drAWPout]

Good evening,

I just obtained a new 1995 GTX 657x. This is my first sea-doo and I am trying to get familiar with 2-stroke engines.

The engine runs super strong and everything is great until it gets a little warm. Then the idle runs super low and the engine stalls. I am hoping it is as simple as the idle speed screw. I see newer fuel lines and have record of a new carb this spring.

While doing this research I noticed the previous owner bought the wrong oil ( TC-w3 ).... Is the best course of action to siphon out all the oil in the tank and put the correct API-TC immediately or does further action need to be taken? Also could this cause the rough idle???

Thanks!

 

[Ckrawiec]

TC-W3 is the wrong oil...you are correct. Mixing oils is not the right thing to do either, so trying to remove all the wrong oil is the RIGHT thing to do, but easier said than done. Might take a while siphoning out the old (wrong) oil but unless you are ready to pull the engine to drain it, etc.....siphoning/low pressure pumping might be the best option.....you'll also probably want to remove as many oil lines as possible, the tank, etc., and clean/replace at your discretion......the oil connection hose to the engine may be impossible to reach without moving the engine so you'll need to work around that with a certain amount of creativity. It'll be a tedious, messy process, but do-able. Good luck.

Doubtful that the rough idle is related......usually carb issues or idle screw adjustment IMHO, although assuming the engine is still sucking/burning in the wrong oil...maybe? I'm assuming the stock oil injection is still installed.

 

[andy.262]

yeah you definitely want to get as much of that wrong oil out as you possibly can before putting the new stuff in. You'll want to replace the oil filter as well.

If the old (wrong) oil mixes with the new (correct) oil, there's a chance it could turn into a gel and plug up your oil lines and filter. It happened to mine when I siphoned out wrong oil and put in right oil. Luckily I caught it before any damaged occurred.

 

[link81]

i have the same issue with mine, and want to totally flush out the system before putting in my new motor. is there some type of solvent i can use to rinse out the tank and pump? maybe gasoline?

 

[andy.262]

Gasoline would probably work, just don't use water - it will take forever to dry

 

[link81]

and water and oil don't mix lol.
i'll just use the old gas out of the tank to wash out the oil tank and pump. that should work fine i think.

 

[SigEp368]

Been seeing other threads that describe poor performance after running for a bit, these were linked to a bad rectifier. I havent had that problem yet, so I can't confirm applicability to your situation, but it may be a direction for you to look. Seems like an easy test to rule it out.