View Full Version : 97 force 120 miss firing at lower rpm

03-07-2009, 04:06 PM
I have a 97 force 120 it will runs fine at higher rpms but between 1k to 2k rpm it has a vibration like it is missing but no hesitation has a good hole shot and runs rite upto 5100 rpm like it should. Prop has a few dings in it. But also does not want to stay running at idle after it warms up. I am thinking maybe low end is running a little rich. Spark plugs have been a little black and oily. Any suggestions?

03-09-2009, 12:39 AM
Dirty low speed jets in carbs?

03-11-2009, 01:26 AM
clean the carbs