1999 johnson 150 idle's rough ??

[ggsr]

my 1999 johnson 150 sea pro started to cough and sneeze when it idles this year.. I changed the plugs, ckecked the carb settings and it still "misses" when it idles..I have looked for a loose wire or hose and have found all is tight. it runs great over 1200 rpm but under that it miss's like heck.. cant seen to find whats wrong.. has anyone had this problem ???

 

[Walker]

Re: 1999 johnson 150 idle's rough ??

Could be the idle circuit in one or more carbs is gunked up. Pull the plug wires one at a time while idleing and see if you can isolate the cylinder causing the problem. If none of them stop the sneezing then check the recirculating system valves. Do you have a manual? You need one.

 

[ggsr]

Re: 1999 johnson 150 idle's rough ??

Originally posted by Walker:<br /> Could be the idle circuit in one or more carbs is gunked up. Pull the plug wires one at a time while idleing and see if you can isolate the cylinder causing the problem. If none of them stop the sneezing then check the recirculating system valves. Do you have a manual? You need one.

Thanks for the tip. i did ck the carbs and by pluging the jet(ala tooth pick) in the top left carb it does run better at idle, does this mean a air leak ?(carb gasket) or a (internal)fuel leak ? thanks again

 

[Walker]

Re: 1999 johnson 150 idle's rough ??

I'd pull that carb, tear it down and do a thorough cleaning. In fact I'd do all 6 carbs. Don't get any carb cleaner on the O-ring type gaskets. Some cleaners can make them swell out of size.

 

[ggsr]

Re: 1999 johnson 150 idle's rough ??

thanks for the help [:<)