1972 Johnson 20 and 25HP differrences

14ftgrumman

Chief Petty Officer
Joined
Jul 19, 2008
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416
The Evinrude-Johnson parts catalog at shop.evinrude.com show the block, crankshaft and conn. rods the same-crankshaft and pistons are different. Anybody know what the difference is?
I've looked at pistons and cannot find a part or casting no. on them, just the "loose" cast into the piston to indicate which way the wrist pin comes out. Cylinder head is different, too.
 
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