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Engine slows then dies at WOT- 1960 18hp Johnson Seahorse
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<blockquote data-quote="Pappy" data-source="post: 273838" data-attributes="member: 3278"><p>First and foremost - I hope you are running this engine on a 24:1 mixture. All OMC engines prior to 1964 required a 24:1 mixture. Does not matter how good the oils of today are in comparison to "back then".</p><p>Give me a time frame on how long it takes to go from 24 to 12mph. When you let off the throttle finally at the 12mph mark does it shut off? Feel like there is a brake of some sort on the flywheel when it shuts off?</p><p>What have you checked? Compression should be checked and gearcase oil should be checked at this point. Stick your head back there at WOT and see if there is ample cooling water. Run with the cowling off when this is happening and when it does and the engine has shut down place your hand on the top of the cylinder head and see if you can hold your hand there for a few seconds. Pull your plugs when this happens and take a look at plug color and let me know what that looks like as well.</p></blockquote><p></p>
[QUOTE="Pappy, post: 273838, member: 3278"] First and foremost - I hope you are running this engine on a 24:1 mixture. All OMC engines prior to 1964 required a 24:1 mixture. Does not matter how good the oils of today are in comparison to "back then". Give me a time frame on how long it takes to go from 24 to 12mph. When you let off the throttle finally at the 12mph mark does it shut off? Feel like there is a brake of some sort on the flywheel when it shuts off? What have you checked? Compression should be checked and gearcase oil should be checked at this point. Stick your head back there at WOT and see if there is ample cooling water. Run with the cowling off when this is happening and when it does and the engine has shut down place your hand on the top of the cylinder head and see if you can hold your hand there for a few seconds. Pull your plugs when this happens and take a look at plug color and let me know what that looks like as well. [/QUOTE]
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Engine slows then dies at WOT- 1960 18hp Johnson Seahorse
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