Going to rebuild my 115hp 1998 Evinrude

[keytoboating]

Hello all, I purchased a 1998 invader mirage boat last year with a 115hp Evinrude. Used a couple of times this year and the last time we were out we started having issues with the motor. Took it to a marine to winterize and run a diagnostic and they found that one of the cylinders has 0 compression. To repair would cost the same the boat did, and we can't afford that right now. So I'm going to try and rebuild it myself.

Any tips/tricks or videos you would recommend to help would be very much appreciated.

 

[tphoyt]

To me the first step would be to determine the cause of no compression and the cause of the failure. A complete tear down would be my first step starting with the head on the failed cylinder to be sure it’s not just a gasket but with zero compression you may not be that lucky.
If that cylinder is toast you may be better off with a used power head as machine work can get expensive if you don’t have a friend to help out.
I’m sure others will chime in.
Best

 

[saltchuckmatt]

Did they scope the bad cylinder or pull the head?

Most likely it's dead but you could try a new head gasket if the piston and cylinder look okay.

In my area Seattle you can no longer get machining anymore locally.

Many videos online on how to rebuild.

 

[racerone]

Model # of this motor ?----Is it another crossflow with the dreaded broken piston ring syndrome?----Easy to rebuild a crossflow and better pistons are available.----You need 4 O/S pistons in my opinion.----And determine the cause of failure or you might need to do it again!