1971 25 hp evinrude outboard issue,

[vidaliaman]

1971 25 hp evinrude outboard issue, idles good but sneezes under a load, compression #1 84 #2 90, seems low, what do ya think? thanks dave

 

[saltchuckmatt]

1971 25 hp evinrude outboard issue, idles good but sneezes under a load, compression #1 84 #2 90, seems low, what do ya think? thanks dave

Yes it's low.

Enrichen the idle mixture screw a quarter turn cc and see if that helps.

 

[racerone]

Perhaps throttle plate is opening too early as well.----Retorque cylinder head screws.-----They often loosen up on overheating.----Check thermostat as they are often missing or stuck open.