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Johnson Outboard Carb Help Wanted

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Amphipod

Member
I have a 1957 Johnson Seahorse outboard engine, model RD-19. We got it at an auction, and it is in overall real good shape. It looks like it has not been run in many, many, years. I took the carb apart, and it needs a real good cleaning. Here are my questions:
What is the black thing on the fuel pickup in picture #1? I could not find it in the parts diagrams. It looks like it used to be a seal.
Is whatever it is necessary?
Is there anything specific I need to check on an engine this old?
Thanks!
 

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Need to do a complete evaluation before spending any $$$ on this motor.----That is a seal for the nozzle.---Fuel is metered into this nozzle from the needle valve in bottom of the bowl.------Modern equivalent is available at most boat shops with a gray-haired mechanic.----I have some on hand for my own motors.----Need to pull flywheel to inspect ignition coils / breaker points.-----Post the compression actual values here.----Will need a new water pump impeller if you get this running well.
 
racerone said:
Need to do a complete evaluation before spending any $$$ on this motor.----That is a seal for the nozzle.---Fuel is metered into this nozzle from the needle valve in bottom of the bowl.------Modern equivalent is available at most boat shops with a gray-haired mechanic.----I have some on hand for my own motors.----Need to pull flywheel to inspect ignition coils / breaker points.-----Post the compression actual values here.----Will need a new water pump impeller if you get this running well.
Click to expand...
Thanks! Would a new seal come in a carb rebuild kit? And is the impeller something you replace on a motor this old, regardless of how much it was used? Thanks again.
 
???-----I do not believe that motor has an overheat warning system.-----Or a system that stops the motor in case of overheating.------Therefor a wise owner would install a new rubber water pump impeller every 5 years.
 
Yes they are.-----Part # of the kit you are looking at?-----And do the complete evaluation before spending any beer tokens on this motor.----Post the actual compression test results.----Remove flywheel and inspect ignition coils before ordering the carburetor kit !
 
OK, I will. How do I do a compression test? It doesn't have electric start, and it has a compression release for pull starting. Thanks!
 
Ok, so I finally got the carb kit and got the carb rebuilt. However, it did not come with reference number 59, which is old and deteriorated and needs replacing. When I look it up on this website and click on the number, it says invalid part number. I'm having trouble finding other websites that have parts for engines that go back as far as 1957. So, I'm kinda lost. Suggestions?
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Well, I GOT HER RUNNING!!!! It was a pain in the shoulders to start it. Not to mention I am 16 years old and weigh 140 pounds. There WERE packing washers in the kit, but I was looking for beveled washers and Ig the carb forms the flat ones and makes them beveled. So I got it all back together and would you believe it there was not one single extra bolt or screw. I don't think it is pumping water, I'm going to get a taller barrel to make sure. I think I need to convert it to a fuel pump, I don't think the pressurized tank is working.
 
Ok, it is pumping water. Now I am having problems tuning the carb. I got the idle good, but I don't know how to handle the high speed. Here is what is going on: As I slowly open the throttle, it responds in proportion to my throttling until it starts to get above idle. Then it takes off and revs really high and starts loudly popping. And convulsing. Can you tell from that info, is it rich or lean? Also, on these is it possible to overrev or am I supposed to get it as high as I possibly can? Thanks!
 
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