55hp johnson won't idle

[Loose screw]

Hey all, my motor runs great at mid to high rpm but stalls at idle. when i push the electric choke it stays running for about 10 seconds then i have to push it again before it stalls out. i'm thinking fuel pump? is a kit a possible fix or a new pump? i'm stumped.

 

[HybridMX6]

Re: 55hp johnson won't idle

Sounds more like a dirty low speed jet on the carbs than a faulty fuel pump. I'd give the carbs a good rebuild and clean, with new rebuild kits.

 

[countvlad]

Re: 55hp johnson won't idle

Sounds more like a dirty low speed jet on the carbs than a faulty fuel pump. I'd give the carbs a good rebuild and clean, with new rebuild kits.

i agree.. when you push the chock you bypass the carbs dumping fuel in the intake manifold... thats why you are runnig for a while...

decarb or rebuild the carbs if you cant remember last time they were done and you'll be back in business

if there was a problem with the fuel pump you would be able to run at WOT

 

[HybridMX6]

Re: 55hp johnson won't idle

Well, you would NOT be able to...

I have a 2000 55hp 2 cylinder, and I need to do my carbs before taking it out again. I have the same problem as the O.P., it idles on 1 cylinder, but runs like a top once you get out of idle. I've been busy and putting it off.

 

[Loose screw]

Re: 55hp johnson won't idle

Thanks for the info. i did a complete rebuild on the carbs in spring with new kits, replaced all fuel lines to no avail. The low speed jets were clean and i replaced the welsch plugs just to double check it was all clean. Could a bigger low speed jet help? i've almost got this thing running to perfection after having sat for 5 years. any other info greatly appreciated.

 

[Loose screw]

Re: 55hp johnson won't idle

one more thing, would running a higher octane fuel help the situation?