Force 90 spitting at low throttle

[phorn7]

I have a 1990 Force 90 hp. completely rebuilt in 2005. Motor has run fine since rebuild -up to last week. Starts as usual and runs well at cruising speed (4500 RPM) but spits and sometimes stalls when I back off to landing speed or idle. I changed plugs and problem remained. Do I have a idle jet issue? How do I identify which carb and how do I fix it? What else should I consider? Can this condition hurt the motor or can I run it like this? Our PA boating season ends in a couple of weeks. Thanks for any help.

 

[foodfisher]

Re: Force 90 spitting at low throttle

If I've learned anything on this forum, the spit/cough/sneeze is a backfire which can damage the fuel pump diaphram. Also, sneezes are usually a symptom of lean running. Reset idle screws and check diaphram.

 

[moparman]

Re: Force 90 spitting at low throttle

any chance it started after filling up ? It could be something as simple as water in your fuel ,but,depending on how much is in the tank , it would have a tendency to show up more at a lower rpm[as I said ,depending on how much is in the tank if any], at higher rpm the motor has more of a chance of running it on through the motor. Also might want to do a spark check to see if you have weak fire. Keep- us posted as to what you find . MOPARMAN