Piston for Force/US Marine 50hp

[ATLfisher]

After a compresssion test I found 0 on my bottom cylinder. After removing head I found out piston and rings are shot. I have looked on the parts on this site and there are about six different pistons for 50 hp. My model # is 507F5A. Can someone help me find correct piston and rings. I have a set of calipers and can measure bore diameter if needed. Thank You

 

[ATLfisher]

Re: Piston for Force/US Marine 50hp

I put a pair of calipers on bore diameter and it came out to 3.1875" I can not find any pistons that size on this site for force motors. Where else can I look?

 

[pnwboat]

Re: Piston for Force/US Marine 50hp

Try this site. Looks like they have a part number for the Force 1984 - 1988 50HP model pistons. Standard size is 3.187. Matches what you measured. You can google the part number to see if you can find a site that has a better price.

http://www.outboardparts.com/chrysler/mall/forcepistons.htm

 

[ATLfisher]

Re: Piston for Force/US Marine 50hp

Thank You so much. That is exactly what I was looking for. I ordered repair manual today so I think I am all set. Thanks again

 

[dolphinhunter]

Re: Piston for Force/US Marine 50hp

i have 3 good slugs that i'll get rid of for really cheap. there from an 87 125 that dropped one due to scoring but i have 3 that look damn near perfect 100% complete. check your bore and stroke size it may be the same and pm me if interested.

 

[ATLfisher]

Re: Piston for Force/US Marine 50hp

Thanks Dolphinhunter. I am waiting for my repair manual to get here friday before I go pulling everything apart. I will then see how much deep the scoring is and find out bore diameter of re-size and get back to you. I am guessing 3.207" or 3.217". Thanks