1997 Johnson 175 Fast Strike

[ncbassman]

I am looking at buying a '97 Johnson 175 Fast Strike, and the compression readings are #1-98, #2-100, #3-96, #4-95, #5-88, #6-90. Are these readings consistent with its age or does the #5 & #6 reading give concern as to the engines life expectancy?

 

[DHPMARINE]

Re: 1997 Johnson 175 Fast Strike

The 88 and 90 is a bit concerting.Can you do another compression test,backwards ? I mean start with #6 and #5 etc.?

Sometimes the battery isn't up to snuff at the end of a compression test,and that's a shame if you condemn an engine falsely.

When I get lower readings like yours,I go back to # 1 and see if it also dropped.

DHP

 

[ncbassman]

Re: 1997 Johnson 175 Fast Strike

The 88 and 90 is a bit concerting.Can you do another compression test,backwards ? I mean start with #6 and #5 etc.?

Sometimes the battery isn't up to snuff at the end of a compression test,and that's a shame if you condemn an engine falsely.

When I get lower readings like yours,I go back to # 1
and see if it also dropped.

DHP

Thanks for the tip, I will do just that, That would be a logical conclusion! I really appreciate the tip! Going to take it out today and will try the test again!

 

[anthony_dicasmirro]

Re: 1997 Johnson 175 Fast Strike

I am looking at buying a '97 Johnson 175 Fast Strike, and the compression readings are #1-98, #2-100, #3-96, #4-95, #5-88, #6-90. Are these readings consistent with its age or does the #5 & #6 reading give concern as to the engines life expectancy?

I have a 98 175 Johnson Fast Strike after the motor has run for 20 minutes it starts to run rough as if it is running on 5 cylinders I changed the spark plugs it didn't solve the problem. Any advise

 

[jonja51]

I just did a compression test on a 96 johnson fast strike 150. Left side 120 middle 118 bottom 100.
Right side top 122 middle 120 bottom 115. The 100 is the lowest cylinder and gave the lowest compression. Should I be worried about it. I'm trying to sell the boat what do I tell them?

 

[GA_Boater]

This thread is from February 2007. Yeah it's old, inactive and now closed. Please start new threads instead of re-opening the oldies. Thanks.