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That’s probably from using automotive motor oil back in the day. I was going to suggest cleaning it out and the bypass disc if it has one. The small holes in it get clogged with carbon making starting the motor a chore and poor idling. There’s no tell tale on these motors as you might lose the circulating water in the system if air can get in. It would be the same as a loose water tube connection. If you want to test the motor on a stand, you can undo the pipe plug under the cylinder and install an adapter for a garden hose. There’s no impellers in these motors to worry about!
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Carbon build up is really bad on this KD 15. Something to check if working on one of these motors. 8to1 gas oil ratio and 40w oil sure made a mess in this one. I am trying to clean the down tube in the lower unit. I cannot get a wire down it yet. I am soaking it with gumout. Hope it loosens up over night. Probably better cleaners for carbon removal but, I am using what I have.
dale
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quote labrador guy:Yup that is the baby! Mine does not have that kill button. It has two metal tabs that look like they contact the housing when the go lever is moved all the way to the left. What is going on with the exhaust damper? A leaver from the carb controls, opens a metal washer on the underside of the exhaust duct. Maybe exhaust relief? Your motor has a cutout on the muffler. Mine has a bolted on cover. Were these motors racers? Plenty thick oil ratio, maybe trying to seal the crankcase? This motor is a learning experience for me. I made an offer and it followed me home!
thanks dale
From what I have learned its a Johnson factory item.
Don’t know if it was an option you could order or
or what determined what motors they would be
installed on. So far I haven’t found any factory
literature that shows it.
A "Boathouse Repair" is one that done without having tools or the skills to do it properly.
They needed that heavy oil to seal the rotary valve. Carbon buildup in the driveshaft housing was always a problem. Later models had sealing rings on the valve that are also used on later V-4, 6 & 8 models. The racing model had roller bearings on the connecting rod big ends and crankshaft mains. Also high compression two ring forged pistons and open exhaust. Several antique "A" racers made high compression pistons the convert the Army-Navy surplus Johnson 10 horse water pump (which had the roller bearings) into a class"A" racer. . . 😀
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