Piston sleeve hairline cracks

[Fortheloveofit]

Hey guys
Well I have a 85hp johson 1980 according to the tag ,
question is would a 60-70's era 85hp evinrude/johnson piston fit or are they different in size as the 80s one is a good motor apart from the one piston showing signs of damage.
Are I able to switch out the piston from my other motor thats down in 2 cylinders (60-70s) or just go find a new piston set,any help is appreciated as I'd love to get it running again nicely
Cheers steve

 

[Fortheloveofit]

Forgot to add tag for the 80's,other motor hasn't got any visible tag (possible mount change according to previous owner)

 

[Fortheloveofit]

Hey guys
Well I have a 85hp johson 1980 according to the tag ,
question is would a 60-70's era 85hp evinrude/johnson piston fit or are they different in size as the 80s one is a good motor apart from the one piston showing signs of damage.
Are I able to switch out the piston from my other motor thats down in 2 cylinders (60-70s) or just go find a new piston set,any help is appreciated as I'd love to get it running again nicely
Cheers steve

Hey guys
Well I have a 85hp johson 1980 according to the tag ,
question is would a 60-70's era 85hp evinrude/johnson piston fit or are they different in size as the 80s one is a good motor apart from the one piston showing signs of damage.
Are I able to switch out the piston from my other motor thats down in 2 cylinders (60-70s) or just go find a new piston set,any help is appreciated as I'd love to get it running again nicely
Cheers steve

 

[jimmbo]

No, the 1980 uses a 3.5 inch bore, and all the 85 from 1968 thru 1978 have a 3 3/8 inch bore

 

[Fortheloveofit]

So I've noticed when I was searching for another part for a different motor it has the same piston as my 80's one so using that should work do you think , it a 175hp 1983 johnson, bores not scored either (thank goodness) .
Kind of hoping it's a go as would love to get it running easily as we have over a month of waiting for the bits to show here(covid strikes again).

 

[jimmbo]

All of the Crossflow V6s were just 1 1/2 V4s and most did indeed have the 3.5" Bore, an exception were the post 1979 235hp and prop rated 175. These had a 3.62" bore.
What exactly are you trying to do, find a used Piston to replace a melted one?

 

[Fortheloveofit]

1 cracked one yes .

 

[jimmbo]

Are you going to re-ring the other 5 cylinders? Have you measured them for Wear? 2 Strokes wear differently than 4 Strokes, and need to be measured in more than just at the Top

 

[Fortheloveofit]

Its on my 80s v4 85hp and yes all are going to be done , rather do that than having to redo it again sooner than later .