What should compression be on a 2 stroke outboard?

What should compression be on a 2 stroke outboard?

Two-Stroke engines should have a compression reading of around 110-130 PSI. Sometimes having compression as low as 80 and 90, the engine will still run great!

What is considered low compression on a boat motor?

Generally, readings below 90 PSI for modern two-stroke outboards indicate a problem; most will produce cranking compression readings in the 90 to 105 PSI range, depending on the engine year, make, and model.

What should the compression be on an Evinrude crank?

However if you watch the end my video below you will see that my 1979 Evinrude 6 Hp cranks easily cold ( 2 pulls) with 60 psi compression This source says the older two stroke outboards below 25 Hp should be between 75 and 85 psi. This source seems to confirm with my understanding that 60 psi in older outboards can sometimes be OK.

What should the compression be on an outboard?

This source says modern two-stroke outboards should be in the 90 to 105 psi range. However if you watch the end my video below you will see that my 1979 Evinrude 6 Hp cranks easily cold ( 2 pulls) with 60 psi compression This source says the older two stroke outboards below 25 Hp should be between 75 and 85 psi.

What’s the compression reading on a Johnson Motor?

Some motors were known to be lower compression motor off the bat. Excellent example of what am referring to is the 9.5hp Evinrude/Johnson motor that where built from 1964 to 1973. It is not uncommon to find compression readings ranging from 55 psi to 80psi on these motors. Most of them are in the 60’s and 70psi range and they run fine.

What should the compression reading be on a two stroke engine?

Two-Stroke engines should have a compression reading of around 110-130 PSI. Sometimes having compression as low as 80 and 90, the engine will still run great! We’ll talk about low results in a minute. Now the Four-Strokes have more moving parts.