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Zero Compression in One Cylinder Yamaha 200

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Zero Compression in One Cylinder Yamaha 200

Old 01-14-2019, 05:26 AM
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Default Zero Compression in One Cylinder Yamaha 200

Hi All,

I've got a year 1999 200HP Yamaha Outboard with zero compression in the port side top cylinder. Motor Number is S200TXRX. Does anyone have any advice or tricks other than a complete rebuild of the power head? Its a clean engine otherwise but before I come to terms about a major overhaul or repower I figured I would ask THT. Thanks!

Zach
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Old 01-14-2019, 05:38 AM
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I'll bet you can buy a can of engine rebuild on Ebay..

Maybe a Yamaha guy can answer, but often you can "cheat" one cylinder in without removing the motor. If you do, find out WHY only one cylinder failed.
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Old 01-14-2019, 08:00 AM
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Try ring free first. Your rings may be carboned up and essentially seized in the grooves. If you can get the rings to loosen up you may fix your issue.
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Old 01-14-2019, 08:03 AM
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There is no snake oil cure.
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Old 01-14-2019, 08:18 AM
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Using a Sharpie X out the 200 and write in 166, drop down a little pitch with a new propeller and keep running it.....
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Old 01-14-2019, 08:33 AM
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0 compression is pretty bad. Look in the cylinder with a boroscope.
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Old 01-14-2019, 08:54 AM
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Assuming you don't break off any bolts, it should be fairly trivial to pull the head on that side and see what is going on.
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Old 01-14-2019, 09:45 AM
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It all depends upon the extent of the damage and how much money you want to put into a repair.

On one end of the scale you might simply have a broken piston without there being any other collateral damage. Clean up the cylinder and install a new non-Yamaha piston and rings. It can all be done in situ. Only the intake manifold and the cylinder head need be removed.

At the other end of the scale the cylinder walls can be scored to the point that the block is essentially trash.

Are you handy with a wrench? Easy enough to remove the cylinder head on the affected side so as to assess the extent of the damage. Once you know where you are, it makes it easier to get to where one wants to go.
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Old 01-14-2019, 05:27 PM
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If you truely have no compression (zero) the head is going to have to come off. There is no discussion. The only way to get out of pulling the head and have an engine that runs on all cylinders is to buy a new engine.
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Old 01-14-2019, 05:52 PM
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I am assuming 2 stroke. There is a good chance the head has blown a hole. Believe it or not, A new head is fairly cheap, new gaskets and a good torque wrench, and your back on the water. Been there. Pull the head.
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Old 01-14-2019, 06:02 PM
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Originally Posted by EMC Pursuit View Post
I am assuming 2 stroke. There is a good chance the head has blown a hole. Believe it or not, A new head is fairly cheap, new gaskets and a good torque wrench, and your back on the water. Been there. Pull the head.
No assumption needed. It has to be a two stroke. Yamaha did not offer a 200 four stroke (F200) until 2002.

But as you suggest, pull the head and see what is to be seen. I would bet on the piston.
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Old 01-14-2019, 06:40 PM
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These days you can get a LED flashlight on a flex shaft that will fit through the spark plug hole. That is a quick peek but it is just gee whiz info because as others have said you are going to be pulling the head to fix anything.
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Old 01-14-2019, 08:49 PM
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Originally Posted by TheRockHawk View Post
Hi All,

I've got a year 1999 200HP Yamaha Outboard with zero compression in the port side top cylinder. Motor Number is S200TXRX. Does anyone have any advice or tricks other than a complete rebuild of the power head? Its a clean engine otherwise but before I come to terms about a major overhaul or repower I figured I would ask THT. Thanks!

Zach
Was that the engine on Craigslist for $1000? If the engine has zero compression in one hole, there is either a TON of aluminum transfer (probably deep scoring too) or a hole in the piston. If there's a hole burned through the crown then you might be lucky. Pull the head and report back. FYI - you won't get away without doing a complete teardown. Luckily it's winter and you have lots of time.

Last edited by BigShrimpin; 01-14-2019 at 09:10 PM.
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