Running rough at idle

xwwh587

Cadet
Joined
Aug 27, 2007
Messages
13
I have a 2000 Johnson 150 (60 degree V6, carbureted). The motor starts and seem to run fine when it warming up, but after I run the boat around the lake for a while and restart, it starts up fine but when I give it gas and idle around it wants to bog and die, I can make it get going if I get on the throttle fast but it still bogs a little but then pick right up (not good if I am putting it on the trailer).

Running it @ about 800 rpm it is running rough, I can tell when it wants to die, then I put it in nuetral and give a little throttle, I have to do this every 2 or 3 minutes while running @ 800 rpm through the no wake zone and while trailering.

Like I said it is a 2000 model, the guy I bought it from has ran it 3 or 4 times since 2005 and has not been serviced since 2004. I know that it needs services, but what can I expect they will do when I take it in? The motor has 50 - 60 total hours on it.

Thanks, Mike
 

jtexas

Fleet Admiral
Joined
Oct 13, 2003
Messages
8,646
Re: Running rough at idle

does it still have gas from 2005 in the tank? that's a problem right there. And spark plugs?
 

xwwh587

Cadet
Joined
Aug 27, 2007
Messages
13
Re: Running rough at idle

does it still have gas from 2005 in the tank? that's a problem right there. And spark plugs?

It had about a 1/4 tank when I first drove it with the previous owner and he said that he always used a conditioner during the winter. I have gone through almost a full tank of fresh fuel myself.

The spark plugs are the same. What kind do you recomend I replace then with?
 

HighTrim

Supreme Mariner
Joined
Jun 21, 2007
Messages
10,486
Re: Running rough at idle

Is there anything about carb service on the service records? Might be time for a cleaning and rebuild and decarb.
 
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