1975 Johnson 115 hp

[bm9913]

I finally got the overheating problem taken care of, thanks to all of you on here. I have two questions left. 1. What is the shift shaft height supposed to be on my 1975 Johnson 115 and which way should the end of it be turned.(the part that you unhook when dropping the lower unit)? and #2. I replaced the fuel pump and checked all the lines, but when starting it for the first time, it won't start until a little gas is sprayed into the carb, after starting, it runs and starts fine. What could be the cause of this at the beginning? It takes forever for the ball to become hard when pumping it as well. I have checked for air leaks but can't find any. Thanks for the help guys

 

[ezeke]

Re: 1975 Johnson 115 hp

The shift rod itself has a foot that is captured inside the gearcase and cannot be adjusted. The swivel barrel at the top needs to be turned counterclockwise until it seats gently then turned out clockwise until the flat part faces the driveshaft. The swivel barrel shoul not be turned more than 2 turns maximum from gently seated.

If you have the original side mounted remote control, holding the toggle switch below the ignition switch up while cranking the engine will engage the choke and enrich the fuel mixture.

 

[bm9913]

Re: 1975 Johnson 115 hp

Thanks thats what I was talking about, the swivel head, right now it is turned to almost the middle of the threads , thats how it was when I first took it apart. So that will help me out alot.
Even when I hold the toggle switch up it still will not start until I spray a little gas in the carb. I suspect that it has to do with the bulb taking forever to pump up, (its a new bulb) I found online, that that could be caused by air leaks, the vent on the gas tank, or the carb floats are not adjusted correctly. Ive checkd the lines, and the vent. How can I tell about the carb floats?

 

[ezeke]

Re: 1975 Johnson 115 hp

When you squeeze the primer bulb, it fills the float bowls with fuel until the floats rise. When the floats are level with the bottom of the carburetor body, the float valves shut, preventing any more fuel from entering and flooding the carburetors.

The float valves will stay shut until the engine pulls fuel from the bowls through the carburetors, emptying the bowls which lowers the floats and so on.

If the engine is not running or being cranked, trying to get more fuel past the float valves when the bowls are full by using the primer bulb will do nothing - unless the floats are not floating or the valves are bad.