Mercury 25hp - How do I tell whether it is a 2-stroke or 4-stroke?

[will941s]

Re: Mercury 25hp - How do I tell whether it is a 2-stroke or 4-stroke?

Good deal, happy to see that you HAVE compression numbers, and that they are coming up. Hey, on the bright side, a older Merc 25hp 2-stroke with pull start only would run numbers like that and be somewhat healthy. Being that it's a 03' and probably had 130psi or greater before the oil incident, well thats another issue. You could run it one or two more times, run the test. Put a can of seafoam in the tank with 6 gallons of premixed gas, run it out and do the test again. If your planning to rebuild it anyway, what would it hurt to see if you could bring the numbers up a less expensive way. Just a thought.

 

[Adder]

Re: Mercury 25hp - How do I tell whether it is a 2-stroke or 4-stroke?

Not a bad idea there will941s. I'll pick some up in the next day or so. Like you said, it can't hurt, and who knows, it may get me back closer to 90 psi. I'll post the results after the seafoam compression test. Thanks.

 

[will941s]

Re: Mercury 25hp - How do I tell whether it is a 2-stroke or 4-stroke?

Hey, and on the bright side, while your burning that 6 gallons of gas you can run around and have some fun with it too, really see what it can do. Keeping my fingers crossed with you that a rebuild won't be in order once it's all said and done, and all options are tried.

 

[Jacket4life]

Re: Mercury 25hp - How do I tell whether it is a 2-stroke or 4-stroke?

I'd make sure I had a trolling motor with a freshly charged battery at all times. Rowing against that river current will be a bear!

Glad to hear you got a little better news, but sounds like you are gonna have to spend some money. Look at it this way, you STILL own your own island, which I think is the HEIGHT of cool!!!

 

[Swinerton]

Re: Mercury 25hp - How do I tell whether it is a 2-stroke or 4-stroke?

Just reading over this thread, and that motor is NOT a 2003 model.. UNLESS someone put an older cowl/hood on it..

That hood is from a 1994-1996 era...