1982 Mercury 25 HP Power head rebuild.

[Codyisfishin]

Hello everyone, first post here. I recently got into the hobby of rebuilding small engines and have some how moved up into outboard motors. I aquired a 1982 mercury 25 HP 2 stroke tiller for the low price of free.99. After inspection I discovered that it had spark but low compression. 70 top cylinder and 30 on the lower. After removing the power head and taking it apart I found that the rings on the lower cylinder were busted but there was also what looked like light rust behind the cylinder. I had a friend tell me that it looked like it had been ran hot. My question is where can I find a power head ring and gasket kit for this engine? I have found one that requires me to bore the cylinders but I'm not looking to do that. I'm just going to hone them out. I'm looking for a complete kit here. I currently have the whole thing taken apart. Every piece separated. Anything pointing me in the right direction would be great. Thank you.

 

[flyingscott]

You cannot bore the cylinders on that motor because it is a chrome bore. I do not believe parts are available for that motor. Find a different powerhead.

 

[Faztbullet]

As posted ..tis junk. Find a good used powerhead if you want to fix and use or scrap it for parts as lower units are starting to become a lil scarce

 

[flyingscott]

I would also add find a later powerhead. You want to find one that has a thermostat in it 86/87 and later. Those blocks have better parts availability and will bolt right to your motor.