Merc 25 can it be fixed?

[Dspur79]

1989 Mercury 25hp
serial number 0B396282
top cylinder compression 20
bottom 120
top piston looks bad and cylinder has a chip in it
thank you for your input I love this motor and it’s been great to me

 

[Dspur79]

 

[Dspur79]

 

[jimmbo]

Looks like one cylinder is gonna need boring and an Oversized piston fitted

 

[Faztbullet]

If the block has Mercosil cast into top of it, it can be bored. If not ist a chrome bore and not worth the effort to repair as easier to find a good block

 

[Scott Danforth]

for the price of an over-bore, I would find another running $200 outboard.

 

[Dspur79]

So the only way to save her is putting a new power head on?

 

[flyingscott]

Mabey mabey not you have a chrome bore motor. IF the chrome is good you may get away with replacing the piston. Boring is not an option.

 

[Dspur79]

Mabey mabey not you have a chrome bore motor. IF the chrome is good you may get away with replacing the piston. Boring is not an option.

In the second picture i know it’s not the best but it shows a little chunk that got taken off or scraped do you think if I replaced the piston something that small wouldn’t really matter? Thanks again guys for your input

 

[flyingscott]

If the chrome is chipped either rechrome or a different powerhead. Your only 2 options

 

[jimmbo]

Forgot about the chrome bores, me bad