No compression on cylinder 6?

[Forgotten]

Hey there, I have a 1993 Evinrude 150 Spitfire. Ran fine all last year. I started it up the other day to get it ready for Memorial Weekend after sitting all winter, and I heard a ticking coming from the engine after the fogging oil cleaned out and it was idling good again. After messing around a little while, I checked the compression and the bottom cylinder on the right side (if facing propeller) showed 0 compression while cranking the starter, and 40 psi with the motor running.

Since the motor ran fine last year, is there any chance that it could be a broken reed or a bad head gasket that didn't emerge until it sat all winter? Any help is appreciated!

Thanks

 

[Faztbullet]

Re: No compression on cylinder 6?

is there any chance that it could be a broken reed or a bad head gasket that didn't emerge until it sat all winter?

Thats engine has a o-ring head design and nearly impossible to blow one. More likely stuck ring or problems before it was winterized..

 

[Forgotten]

Re: No compression on cylinder 6?

Is there any way to free a stuck ring without tearing the motor down, or am I just being hopeful? What about a broken reed? Wouldn't that keep the cylinder from being able to build compression?

 

[Joe Reeves]

Re: No compression on cylinder 6?

Whatever the problem... the first thing to do is to remove that cylinder head to inspect the piston, cylinder walls, the sealing O ring, etc. Hopefully you simply have a failed O ring.

 

[Forgotten]

Re: No compression on cylinder 6?

Thanks for the responses guys. I have been looking at Evinrude's parts diagrams and it doesn't look too complicated. I am very mechanically inclined and very familiar with 2 stroke engines in ATVs, but I have never worked on an outboard before.