compression

[wili]

I have been reading on this site that compression should be 100 or more with not more than 15 difference between cylinders. I have a 1990 Johnson 150 gt with compression readings of<br />90 90<br />90 90<br />85 85<br />The service guy said this was good that they look for more than 15 difference between cylinders. Should I be concerned, I am hearing two different stories?<br />Thanks in advance

 

[JB]

Re: compression

Howdy, Wili. Welcome to the board.<br /><br />If the wrench took the readings with the engine cold I would agree with him, but ask how many hours the engine has on it. The compression is about the minimum I would accept, but the variance is very good. <br /><br />Compression guages will give different readings and different wrenches use different procedures, so I don't think you have any worries there.<br /><br />Red sky at night. . .<br />JB

 

[wili]

Re: compression

I will be talking to him next week and will ask the questions you brought up. The motor does not have an hour meter on it that I am aware of. Thanks for the reply