1963 Evinrude 18hp barely runs

[Jrlucas13]

I recently aquired a 1963 Evinrude 18hp with a old jon boat. I tested the compression and have 100psi on both cylinders. I changed and set the points and condensers (coild were fine) and replaced the sparkplug wires with copper core wires. I cleaned the carburetor and put a new carb kit on it. I can get the motor to barley start by holding down the throttle and choke it’ll sound great for a most 15 seconds.

 

[racerone]

What happens when you operate the manual fuel pump ?----Does it keep running ?

 

[boobie]

Meaning the primer bulb.

 

[Jrlucas13]

Nothing different really.

 

[oldboat1]

Carb needles? 1 turn open for the h.s., 1 1/2 for the l.s. At the moment, it sounds like it's too lean, or the carb opening is not synced with rotation of the timing plate.

When you clean the carb, the nozzle in the middle has to be squeaky clean -- all the small holes open and clear. Additionally, the gasket has to be in place at the bottom of the nozzle.

 

[Jrlucas13]

The throttle is synced with the timing plate. I don’t have a high speed needle. When I rebuilt the carburetor I noticed that the bottom of the high speed nossel was broken at the end where you unscrew it. I just used visgrips and i put the large rubber gasket at the bottom instead of the cork gasket.

 

[racerone]

Is the high speed jet ( orifice plug ) that is in the bottom of the float bowl clean , yes or no ?----But the 63 model does show an adjustable high speed needle.-----Somebody may have put a newer carburetor or bowl on .---All bets are off now.

 

[Jrlucas13]

Well i just took the carb back off and a few interesting things are obviously apparent. The new gasket is partly dissoved and the dissoved gasket coated the bottom of the bowl. Ill post pictures of all of this including my high speed nozzle.

 

[oldboat1]

Did you run a solvent through the carb when running? Seafoam maybe? Unless that's an old gasket, it looks like something attacked it.

Having said that, the proper way to clean the carb is to disassemble and soak metal top and bottom in cleaner. I use lacquer thinner, then clean out all openings with carb spray and soft wire. That nozzle was presumably not removed and cleaned -- in any case looks like it needs to be replaced. Can't say whether that will be enough, as there may be mixed parts, but won't have a chance unless it's clean.

 

[Jrlucas13]

I previously took apart the carb and soaked it in barrymans carb cleaner. I cleaned the nozzel and the only problem is the broken pice.

 

[racerone]

Have you had the high speed jet in the bottom of that float bowl out for inspection ?

 

[Jrlucas13]

I previously took apart the carb and soaked it in barrymans carb cleaner. I cleaned the nozzel and the only problem is the broken pice.

 

[racerone]

Second picture shows the nozzle.----The high speed jet is in the bottom of the FLOAT BOWL.

 

[Jrlucas13]

It looked clean through the bottom drain hole. I don’t think it is removable.

 

[racerone]

--Why , yes it is removable !

 

[Jrlucas13]

Anyway i soaked it in carb cleaner for a hour rinst it and put on a new carb kit that i had laying around and it started for the first time that i owned it. Thank you all for your help.

 

[oldboat1]

Well done!

Will remind you to change out the impeller as a first priority, and run in a barrel (think large plastic trash can) -- water about 6 inches or more above the water pump.