Odd Compression Numbers

[Wide_N]

E200STLERK Evinrude 200 HP 1994. Compression numbers are 125, 128, 103, 125, 98, 97. I usually don't come across numbers this high on these engines. I understand the variance is not good. I bought the motor to part out in the first place but I will probably clean the carbs and run it a little and see if it gets better. I guess I am just looking for thoughts. I don't think I have seen many big bores like this with a compression over 110. Much less almost 130.

 

[GA_Boater]

Have you tried another gauge for comparing? What does the carbon build up look like in the high cylinders?

 

[racerone]

Take cylinder head off ( 98 97 values ) to have a look in there.-

 

[boobie]

Run some BRP Engine Tuner through it and follow the directions on the can. Then see what the compression is.

 

[Faztbullet]

5 and 6 are always a tad lower due to head design as chamber CC is bigger.