1987 Evinrude 70HP Lost top end

[mncafik]

Hi, I have a 70HP evinrude.. just rebuilt with wiesco pistons, bored .30 over, new bearings etc etc... I was out today, and after about 1hr of running, I lost my top end.. it started cutting out.. then totally gone. The most rpm I could get is 4100... usually goes to 5500rpm with a 21pitch prop doing 45mph... what gives.. fuel consumption was gastly after she lost the top end.. i am thinking either dirt in the carb, or the powerpack, or coils...<br /><br />Any help would be greatly appreciated...

 

[Walker]

Re: 1987 Evinrude 70HP Lost top end

Go back to the basics, Fuel, Compression, and Spark. Compression is where I'd start

 

[mncafik]

Re: 1987 Evinrude 70HP Lost top end

Thanks, turned out to be a weak coil.. replaced all three, and she purrs like a kitten...

 

[Dhadley]

Re: 1987 Evinrude 70HP Lost top end

5500 is way low on that motor. Work with the set up -- after its broke in -- to get as close to 6000 as you can.