1988 50Hp Yamaha Bad Cylinder Pressure

[walrus98]

Top two cylinders are about 110 psi. Bottom cylinder is about 30 psi. What's my first step?<br /><br />Thanks, in advance!

 

[gr8rg8r]

Re: 1988 50Hp Yamaha Bad Cylinder Pressure

I would remove the cylinder head and see if you had just blown a head gasket. Look for any scoring on the cylinder wall that would require reboring of the cylinder walls.<br /><br />Hopefully, you got lucky and only need a new head gasket.<br /><br />Richard

 

[walrus98]

Re: 1988 50Hp Yamaha Bad Cylinder Pressure

Thanks, Richard. I'll try that.