1976 Johnson 85 hp

[Dillon]

My motor has good compression all around (120+). It starts good and idles good. The boat gets up on to step fine and runs smooth for a few minutes. Then all of a sudden it will bog down and die. Then it will start right up again and continue to repeat this process. Fuel problem? Coil?

 

[Franki]

Re: 1976 Johnson 85 hp

sounds like fuel problem, <br /><br />If you keep pumping the primer bulb, does it keep running smooth? if so then you need to look at fuel pump and maybe the lines...<br /><br />do it logically, clear the fuel system of blame first, then look at the ignition system.<br /><br />Check and clean all your electrical connections, (I consider that regular maintenance).<br /><br />If the problem is there, its time to fire up the multimeter and start checking things.<br /><br />rgds<br /><br />Frank

 

[Dillon]

Re: 1976 Johnson 85 hp

I am having a hard time determining if it is my fuel pump, when I pump the primer bulb the rpm's pick up a little. I will change out my fuel line and check my vent on the gas tank see where that takes me. When I run the motor out of the water it runs fine and does not bog down. It only seems to be bogging out and quiting when I am running up on step in the water. ???? <br /><br />I appreciate your advise Franki.<br /><br />Dillon

 

[Bob_VT]

Re: 1976 Johnson 85 hp

Frank nailed it right on the money. Now consider a fuel pump rebuild kit. Changing out the fuel line probably will not help. I bet it is the small diaphram in the fuel pump.<br /><br />Bob

 

[Dillon]

Re: 1976 Johnson 85 hp

I changed out the fuel pump. It needed to be replaced but that did not solve my problem. The boat gets up on step and runs fine for a few minutes and then it bogs down and dies. Then it will usually start right back up and run fine for a little ways and then die. I am noticing a little lack in power, but I have real good compression. There is a little noise coming from under neath the fly wheel. Could it be my stater, ignition related....<br /><br />Ak Dillon

 

[fireman 757]

Re: 1976 Johnson 85 hp

Swap your coil wires and check for spark. I'm betting one is breaking down and arcing to the block.