1995 Johnson 150HP Compression Results

[allmuckmojo]

Ok, So im selling my boat and had a guy come by and look at it, he did a compression test and said it looked good. I wrote the numbers down, can someone tell me what their professional opinion is, thanks!

1 - 110
2 - 95
3 - 97
4 - 95
5 - 105
6 - 95

I also had a guy contact me and i gave him the results, he said they were too low, any information would help, thanks. I also started her back up for the first time this year and she spat out a bunch of smoke at first, is this normal?

 

[boobie]

Re: 1995 Johnson 150HP Compression Results

They don't look that bad to me but a good decarb may help them. Just remember, compression gauges vary and no two are the same.

 

[JB]

Re: 1995 Johnson 150HP Compression Results

There is a 20% span. That is too much. She needs a decarb.

Too low? No. Those big V6s were low compression engines. Anything over 80psi is fine.

 

[allmuckmojo]

Re: 1995 Johnson 150HP Compression Results

There is a 20% span. That is too much. She needs a decarb.

Too low? No. Those big V6s were low compression engines. Anything over 80psi is fine.

Is it normal to have decarb once a year if not properly taken care of? i just got rebuild last year, could i seafoam it?

 

[JB]

Re: 1995 Johnson 150HP Compression Results

Follow the instructions on the can/bottle and Seafoam should do the trick.