Re: 95' 115 HP Evinrude failed need advice
Ok, good info.<br /><br />5200 is lugging the motor severly, especially with no load. As the load increases the top capable rpm will come down. This increases combustion heat even further. Excess combustion heat is the mortal enemy of 2 stroke motors. Your target rpm with an average load, for the longest engine life, is 5800. <br /><br />The Stiletto is a very good prop. Once we're running again we can probably change the set up to gain some rpm with the same prop. You still may want to think about another prop of less pitch for skiing. You need a spare anyway. We'll get back to the prop issue later.<br /><br />NGK's in an OMC is a big no-no. Champions only. It wont be the only cause of the piston scuffing but it contributes.<br /><br />Perfect choice on fuel. Make sure you use a good TCW III oil too (I'm sure you do).<br /><br />Tribble Machine is in Waxahachie. If you need a good machine shop and a very good engine builder, contact Paul at 972-617-6301. Great guy, very knowledgeable.<br /><br />I'd guess we had several things working towards this issue. The motor was lugging to start with which causes additional combustion temp. The NGK's contributed to more heat. The load from the tube and people caused the motor to work even harder. More combustion heat. <br /><br />If the water pump hasnt been changed in a while that may have contributed too. I'll almost bet the little deflectors in the water jackets have swelled causing some restriction in the water flow. That'll add more heat. <br /><br />Was it the starboard side that failed?<br /><br />As far as more hp, youre not getting all thats available from what you have. But to answer your question, no a 130 or 140 looper powerhead will not fit on that midsection. I think you'll be happy with it once its up and running and we work on the set up some.
