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  #1 (permalink)  
Old 06-19-2017
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Join Date: Jun 2017
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Default hand cranking

Hi, I have a 70 2 stroke yamaha that I think it seized up on me, I try turning it with socket and seems pretty stiff, after a couple turns it turns freely pretty easy, leave it for a couple of days and it's hard to turn again, keep trying and free again. anyone know what could be the cause?
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Old 06-19-2017
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Join Date: Dec 1969
Location: Greenville,S.C.
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Remove spark plugs and then try to turn motor to determine if stiffness is compression related....
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Old 06-19-2017
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Join Date: Dec 1969
Location: middle Texas coast
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remove the lower unit to make sure that is not what it binding up
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Old 06-19-2017
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Join Date: Aug 2012
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Follow YAM suggestion.

A few years ago I had exactly the same problem on my 30 3 cyl.
The problem was on lower unit.
Had water instead of gear oil and seized the bearings
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Old 06-19-2017
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Had bottom unit off same thing
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Old 06-19-2017
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Did you remove the plugs before trying to turn it?
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Old 06-19-2017
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Join Date: Dec 1969
Location: middle Texas coast
Posts: 9,466
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if lower unit removal did not help then you will have to take it apart to see what is wrong.
bearings or pistons and cylinders are messed up is my guess
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Old 06-20-2017
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thanks for your reply's.
.
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