1981 mercury 25 hp 2 cycle

JENNIE116LOWE

Petty Officer 3rd Class
Joined
Mar 31, 2013
Messages
86
I have a chance to buy a 81 mercury 25 hp 2 stroke for cheap. Compression is good 135 and 140. Idles well, pees well, and is remarkable shape for being 30+ years old. Any thing else I should look at before buying? Thanks
 

Barnacle_Bill

Admiral
Joined
Feb 8, 2004
Messages
6,469
Re: 1981 mercury 25 hp 2 cycle

Check the lower unit for water intrusion. Has the motor sat for any length of time without being ran?
 

Mi duckdown

Commander
Joined
Apr 14, 2007
Messages
2,575
Re: 1981 mercury 25 hp 2 cycle

Check lowerend gear oil for water intrusion. How cheap?
 

quicktach

Petty Officer 1st Class
Joined
Aug 24, 2012
Messages
394
Re: 1981 mercury 25 hp 2 cycle

Drain some gear oil over a magnet and look for metal slivers. Also look at gear oil ..is it creamy white --showing a water leak. Does all the wiring look good with no signs of abrasion or cracks? Run it on the water from idle to WOT ...how's it seem ...good run up ? Any bad vibrating ....signifying mount replacement needed. You might look at cylinder tops for heavy signs of carbon....

Otherwise, if the price is right ...go for it ....they're a good motor !
 
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