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yamaha 50elf doesnt idle slow

vroomZOOM

Regular Contributor
Hello. I have a 50 elf motor which doesnt want to idle at less than 2000 rpm. if below that then the tach needle is bouncing and there is a lot of smoke ( running rich). cleaned the carbs and replaced the fuel pump. that helped but not a lot. anyone have ideas? it runs nice and smooth after 3000 rpm
 
Try a cylinder drop test,pulling one plug wire at a time with plastic pliers,listen for a sound and rpm change, The one with no change is the bad one
 
ok will try that. the problem is when there is a lot of smoke below 2000 rpm, I get that speed by running the motor very rich so that it almost floods out, and it seems to be firing too good. the only way I get the rpm down is by running blubering rich, with butterflies fully closed, and it still runs too fast after that
 
YAY - finally got the idle down. some idiot before me thought the timing advance made the motor idle faster. it was cranked to FULL ADVANCE at idle. I turned it down and it had an instant effect - idles smooth and slow
 
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