what is acceptiable compression for a 92 johnson 150 4 stroke?

[86bonito]

Saw a boat on ebay had a johnson 150 4 stroke wrote the guy a question of compression he stated all were with in 5% of 90psi is this good for a 4 stroke? I know 2 strokes should be at 125 or above.
just trying to further educate myself.

 

[tfbrown1270]

Re: what is acceptiable compression for a 92 johnson 150 4 stroke?

I'm no expert but I don't think there was a 4 stroke johnson in 92....do you mean 2002?

 

[Silvertip]

Re: what is acceptiable compression for a 92 johnson 150 4 stroke?

You had best ask the seller for the Model and Serial Numbers. Without that information you have no idea what you are buying. There simply is no 1992 Johnson 4-stroke. 4-cylinder yes.

 

[clint]

what is acceptiable compression for a 92 johnson 150 4 stroke?

Compression of 100 or better is good. 125 usually is a max. Good Luck!
Clint 8)

 

[JB]

Re: what is acceptiable compression for a 92 johnson 150 4 stroke?

Compression numbers vary a lot because of differences in guages and technique.

If 4 (or 6) cylinders measure within 5% of 90psi I would call that good. It is almost impossible for four or six cylinders of a 2 stroke to fail in the same amount at the same time.

There was no Johnny 4 stroke of any size in 1992.

The 1992 Johnny 150 was 6 cylinders, not 4.

Given the number of impossible claims I would drop any interest.

Either the seller hasn't a clue what he has or he is a bad scammer (or both).

 

[86bonito]

Re: what is acceptiable compression for a 92 johnson 150 4 stroke?

Compression numbers vary a lot because of differences in guages and technique.

If 4 (or 6) cylinders measure within 5% of 90psi I would call that good. It is almost impossible for four or six cylinders of a 2 stroke to fail in the same amount at the same time.

There was no Johnny 4 stroke of any size in 1992.

The 1992 Johnny 150 was 6 cylinders, not 4.

Given the number of impossible claims I would drop any interest.

Either the seller hasn't a clue what he has or he is a bad scammer (or both).

 

[86bonito]

Re: what is acceptiable compression for a 92 johnson 150 4 stroke?

I thought 92 was early for a 4 stroke on a johnson I just went off of the picture online that had 4stroke in lettering on the engine.
thanks for the comments