Good compression ?

[HavToNo]

I have a 1984 70hp Evinrude and I just started it up for the first time this year. I let it run for 2 or 3 mins to let it warm up and get rid of the fogging oil and then pulled the spark plugs and did a compression test. Top 141 Middle 145 Bottom 139. From what I've seen these are good numbers for a 23 year old motor. Are these numbers right or are they high because there was still some fogging oil left in the motor. Would it be better to give it a good run on the lake and then test again? BTW The compression tester is new.

 

[wilde1j]

Re: Good compression ?

Relax, the numbers are great. Put the tester away and get the motor ready for this season!

 

[tashasdaddy]

Re: Good compression ?

that's the reason for fogging, keep things lubbed, so they work correctly. great compression. have you ever done a decarb? look it up in the engine faq fourm.

 

[DHPMARINE]

Re: Good compression ?

Run her around the lake a few times.2 to 3 minutes running does very little to get the pistons and rings up to temp,and that makes compresion,and that is what you are trying to test.

DHP

 

[HavToNo]

Re: Good compression ?

Do I really need to do a decarb with numbers like this.