Merc 25hp Low Compression - Power Head Swap?

Clink123

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Oct 4, 2024
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I have a 1993 25HP 2 Stroke Manual Start (0D266835) I've been troubleshooting. The top cylinder is reading a meager 50psi and the bottom is reading 115. I think the most cost effective solution is to find a used powerhead online and swap the two. Thoughts?

Looking for some knowledge on what year 25hp merc is compatible with my outboard? I've noticed that some 25hp powerheads online show the spark plugs on the aft end of the block directly into top of the cylinder while mine are sort of offset to the cylinder (port side). Would this be an issue?

Any input appreciated. The swap looks simple enough if I can find the right match.
 
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