1991 50hP Johnson won't idle

[IRONRANGER]

91 50hp johnson won't idle, (rebuilt carbs) I can get it to start when throttled up but will die after a few seconds, but if I hit the choke it run a little longer, won't run without throttled up?

 

[Big Bubba]

Re: 1991 50hP Johnson won't idle

Clean, clean, clean, clean the carbs really good and make sure every orifice jet is completely clear. Reason I say this is you might not have gotten it the first time cleaned as good as you thought you did. Also check the fuel lines for fuel leaks. Let us know what you find out. Take care, Bob

 

[IRONRANGER]

Re: 1991 50hP Johnson won't idle

the carbs where spotless I dipped them and blew out everythig great ,used little wires and flashlites, absolutly spotless.

 

[tx1961whaler]

Re: 1991 50hP Johnson won't idle

You've got good compression (other thread), and good spark (assuming it runs fine at high speed...), than all that is left is fuel delivery. Check for air leaks in the lines, make sure the spark plugs are clean, etc. When the carb was rebuilt, was the welch plug (#5) removed and all of the tiny idle passages cleaned out?
The (#7) nozzle gasket needs to be in real good shape also

 

[tashasdaddy]

Re: 1991 50hP Johnson won't idle

do a linc n sinc. should solve your problem, you are idling too slow.

 

[Silvertip]

Re: 1991 50hP Johnson won't idle

Some of those carbs had idle mixture screws. If you removed them, have you readjusted them properly -- in the water, not on muffs.

 

[IRONRANGER]

Re: 1991 50hP Johnson won't idle

I have the slow speed idle adjusted out 1 1/2 turns on both carbs, what does the linc n sinc consist of?

 

[IRONRANGER]

Re: 1991 50hP Johnson won't idle

O-ya, It wont idle even with some throttle , unless you hit the choke every few seconds. it wont even start without some throttle.

 

[Ware5150]

Re: 1991 50hP Johnson won't idle

I have had a lot of idle problems with my 85' 115. I corrected some issues by adding a clear inline fuel filter from Walmart. I then could see that is was running out of fuel and not staying full after pumping. Using an air compressor I found a small leak near the bulb. Fixed the leak and Fuel delivery is not an issue anymore.

Hope this helps.