hand cranking

[tuliosperandio]

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?

[robert graham]

Remove spark plugs and then try to turn motor to determine if stiffness is compression related....

[99yam40]

remove the lower unit to make sure that is not what it binding up

[almetelo]

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

[tuliosperandio]

Had bottom unit off same thing

[pstephens46]

Did you remove the plugs before trying to turn it?

[99yam40]

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

[tuliosperandio]

thanks for your reply's.
.