installing new rings

[jstrat7804]

has any one installed new piston rings I am thinking of doing this over the winter. 1990 225 evinrude

 

[robert graham]

Re: installing new rings

Are you sure you need to do it?...how's your compression? On a 2 stroke motor installing new rings is a Major job requiring splitting of the crankcase, etc. I've never heard of a 2 stroke outboard motor wearing out a set of rings, usually other things cause the demise of the motor. You can do it, but you'd be biting off a major job! Good Luck!

 

[j_k_bisson]

Re: installing new rings

Yep did that last winter. check out this link;

http://forums.iboats.com/showthread.php?t=457212

Hope it helps.... It was alot of work! It also was going thru everything....

 

[boobie]

Re: installing new rings

Why do you want to do it??

 

[1946Zephyr]

Re: installing new rings

Ahhhh come on guys, don't scare the man. Doing a re-ring is easy as pie. Usually, the pistons get issues, before the rings do, because they get badly scored from lack of oil, or overheating. If you go into it, may as well do the rings though

 

[j_k_bisson]

Re: installing new rings

I agree with Bobbie. Why do it? Is it a lack of compression? These motors only have around 80-95 psi with new rings. Hell I redid mine last year and all I got with the new rings where 85 psi when it was done and broke in.

So again Why re ring the motor? If it is due to compression, check it and post it. If it is idling/running issues, then you are barking up the wrong tree. That is fuel system/recirculation system issues. Not rings........

 

[1946Zephyr]

Re: installing new rings

Those only put out 80 - 95 with new rings? Yikes. That isn't much. You won't have much to loose there, before you need to re-ring it. I got more than that, from an old 10hp Must be a low compression motor. I would have thought they would be at least 120 with new rings.

 

[boobie]

Re: installing new rings

The looper is a different mtr and 85-90 psi is normal on them.

 

[dehydrated]

Re: installing new rings

theres more that can be done to boost compression and these motors are fairly inexpensive to rebuild so why not . i have my project set for this winter rebuilding gets me out of the house and its something i really enjoy

 

[jstrat7804]

Re: installing new rings

Thanks for all the input guys, if 85 to 90 is normal then i think i am ok i have 75-85 90 left bank and 85 90 90 right bank I basically got the engine for zip the only thing that it needed was a power pack and a tune up and it ran fine . the thing that gets to me is the cold start she can be a real ***** but when she start she will run all day with no problems. I did all the cold star procedures and she still is very hard to start.

 

[j_k_bisson]

Re: installing new rings

If it is hard to star then you need your carbs redone. With those compression numbers I would pay close attention to the 70 and 80 PSI cylinders. There is something wrong there. Those number mandate a rebuild. But that is after carb rebuilds and a good decarb....... If you do not want to spend the money on the carb rebuilds and want to find out what is going with the compression, then either pull the head and look at things, or get a bore scope and take a look for scoring and busted rings. Like I said there is something up with that one cylinder at 70 and 80. I would not run this motor until I find out what......

Just my opinion.

 

[jstrat7804]

Re: installing new rings

Thanks for the reply chief, I thought if the compression is within 15 lbs you are ok no ?

 

[j_k_bisson]

Re: installing new rings

Yes and No. Yes you can run it, but is is going to break soon? Yes.
Not so much break, but run like crap......

So you are currently having problems starting and idling? Then look into this drop of compression on the two/one cylinder. Resolve compression issues and then you should have a reliable starting and idling motor. If not that compression can keep going south and then you have a really big bill when fixing it.