1971 johnson 50 hp hydroshift

[striperangler9]

I just purchased a 1971 50hp johnson hydro-static shift. I tore the lower unit down replaced the water pump housing impeller, and metal plate. I also changed the fluid in the lower unit, and replaced the spark plugs. I attempted to start the engine but it will run for about 15 seconds before shutting off. I took out the float needle valve, and cleaned out the carb with carb cleaner. The carbs seem pretty clean. I can keep the motor running by periodically pressing the choke switch. Can anyone give me some insight on this issue please. I'm desperate.

 

[freddyray21]

Re: 1971 johnson 50 hp hydroshift

carb needs to be disassembled and soaked. There are a few little passages in there that a spraying of carb cleaner won't get to. Often they have to be cleaned out with a small strand of wire.

 

[tashasdaddy]

Re: 1971 johnson 50 hp hydroshift

Read the TOP SECRET FILE, 1st theard in this forum. you have an adjustable low speed needle. start at 3/4 turns out.

 

[striperangler9]

Re: 1971 johnson 50 hp hydroshift

Thank you I'll try it.