Compresion gt 200

[Mr Storm]

I need to know stock compression on a 1989 Gt 200 Johnson.

 

[Shawnfish80]

Ive tried to find those numbers for any year or model evinrude johnson for years and have came up with nothing.....good luck!

 

[Shawnfish80]

100 or over id assume is good...

 

[racerone]

A lot depends on what gauge you would be using etc, etc.-----So what numbers do you see on your motor ?-----What is the reason for your compression concern ?

 

[Mr Storm]

Ive tried to find those numbers for any year or model evinrude johnson for years and have came up with nothing.....good luck!

Thanks

 

[Mr Storm]

A lot depends on what gauge you would be using etc, etc.-----So what numbers do you see on your motor ?-----What is the reason for your compression concern ?

I am buying a 1989 Storm Bass boat, boat been redone transom deck ect. But has a Gt 200, they say runs good but would like to know how good or bad the #s are. Motor has new stater,P.P. Starter,

 

[Mr Storm]

Ive tried to find those numbers for any year or model evinrude johnson for years and have came up with nothing.....good luck!

I don't understand Y this is so hard... Somewhere there has to be a place that hE these #s

 

[Mr Storm]

A lot depends on what gauge you would be using etc, etc.-----So what numbers do you see on your motor ?-----What is the reason for your compression concern ?

And if u ha e a good gauge it shouldn't matter.

 

[Faztbullet]

Anything over 90psi

 

[tblshur]

u probably know but needs to be within 10 psi of one another good luck

 

[dwco5051]

I had a 1990 GT175. After a complete rebuild it showed right around 91 on all six with my gauge. These are not a high compression motor from what I was told. Ran perfect for ten years or so until I sold it last year.

 

[Faztbullet]

That motor has a "open head " as we call it and builds compression as it runs.(see 1st pic)

It is a non finger port motor and need to be propped to the 5200-5600 RPM range and luvs the petrol!!
The later models after 91-1/2 have finger ports and tighter heads like picture below(for V-4 but same configuration) and are a tad better on fuel and like the 5500-6000RPM range

 

[Mr Storm]

u probably know but needs to be within 10 psi of one another good luck

Thanks, ya I heard 5-10 % of each. Power two to be a little lower...

 

[Mr Storm]

I had a 1990 GT175. After a complete rebuild it showed right around 91 on all six with my gauge. These are not a high compression motor from what I was told. Ran perfect for ten years or so until I sold it last year.

Thanks, ya I heard it was a low compression motor...

 

[Mr Storm]

That motor has a "open head " as we call it and builds compression as it runs.(see 1st pic)
View attachment 334006
It is a non finger port motor and need to be propped to the 5200-5600 RPM range and luvs the petrol!!
The later models after 91-1/2 have finger ports and tighter heads like picture below(for V-4 but same configuration) and are a tad better on fuel and like the 5500-6000RPM range
View attachment 334007

T.U. Ya I was told it is a low compression motor.. Someone said 80 was factory number. But I think that is low. 90 sounds more like it.. This weekend I'm gonna go see the Storm. Do a Comp. test after I warm up the motor.. It's old school but 2 strokes are Bad Ass. This same guy has a 1989 GT V8, for 8k has some work done to it. It was on this Storm. The boat had all new Transom work done to handle weight and power.. I'd like to own it.

 

[Mr Storm]

u probably know but needs to be within 10 psi of one another good luck

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