Compression Problem-'90 90HP Force

[redrooster]

What should the compression be on a 1990 90HP Force engine per cylinder? Did a compression test and mine are: 125 top, 75 middle and 125 bottom. What is my problem? Any info. would be greatly appreciated. Model Number 906A90A-C

 

[Kajun37]

Re: Compression Problem-'90 90HP Force

looks like your #2 Cyl is blown...

 

[roscoe]

Re: Compression Problem-'90 90HP Force

Welcome redrooster.<br /><br />125 is good.<br />75 is bad. <br /><br />Hopefully only a head gasket.<br /><br />How did the sparkplugs lok when you removed them?

 

[redrooster]

Re: Compression Problem-'90 90HP Force

the plug is wet but not to black.

 

[roscoe]

Re: Compression Problem-'90 90HP Force

I was hoping you would say it was steam cleaned and shiny, an indication of water in the cylinder from a blown head gasket.<br /><br />re-do the compression test just to be sure.<br /><br />Then you will need to remove the head to inspect for damage.

 

[redrooster]

Re: Compression Problem-'90 90HP Force

I took off head and motor is junk. middle piston blow a ring off. other 2 are scared to bad to boreout. I need to know if i can sleeve it out.

 

[redrooster]

Re: Compression Problem-'90 90HP Force

DOES ANYONE KNOW WHERE I CAN GET SLEEVES FOR A 1990 90HP FORCE MOTOR MODEL#906A90A-C. THANKS FOR ALL YOUR HELP ROSCOE!!!

 

[imported_LakeRunner]

Re: Compression Problem-'90 90HP Force

Take the head to a local bike or ATV shop if you don't have a marine shop to take it, they can usually do the job for you. If you can do it yourself, here is good site to start. web page

 

[redrooster]

Re: Compression Problem-'90 90HP Force

lake runner hey thanks for the great idea it never even came over me to take it to a bike shop thanks.