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  #1 (permalink)  
Old 3 Days Ago
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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 3 Days Ago
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Remove spark plugs and then try to turn motor to determine if stiffness is compression related....
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  #3 (permalink)  
Old 3 Days Ago
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remove the lower unit to make sure that is not what it binding up
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Old 3 Days Ago
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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 2 Days Ago
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Had bottom unit off same thing
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Old 2 Days Ago
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Did you remove the plugs before trying to turn it?
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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 1 Day Ago
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thanks for your reply's.
.
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  #9 (permalink)  
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Quote:
Originally Posted by tuliosperandio View Post
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?
Are you running pre-mix or the auto lube system? If the later, has it been going thru oil normally?

How do the spark plugs look?

Can you peek down the spark plug holes with a strong flash light for anything unusual?
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