18 hp evinrude locked up marvel mystery oil?

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Randaln

Active member
Joined
Nov 15, 2020
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Location
Springbay Illinois
Got A 18 hp evinrude I took out of storage and it seems to be locked up it’s in neutral
What do you guys use to unlock or free up a piston THANX
 
I have used Kroil and that did the trick but I have heard marvel oil mixed with acetone 50/50 is also good. Might have to drop your lower unit to make sure thats not the problem.
 

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