float needle and seat.

[Maxwell-8 4,277]

I am always struggling with the float needle and seat on carbs. every gasoline powered powered machine I come across it has that problem. So I clean the carb, blow out the seat, wipe over the float needle. but they still all overflow. some times i'ts visible thru the carb, other times I go check the oil and a day after I just put new oil in her, she is overfilled smelling like gas. The needles don't look worn (or so i think)

What am I doing wrong, and are there any tips and tricks? 

[gwest_ca-(File Mod) 11,047]

Have a vacuum pump with a gauge on it? I turn the carb upside down and put a light vacuum on the inlet. It should hold. Simulates the fuel closing the valve.

 

Stick the float in the refrigerator for a while. Remove and submerge in warm water. Watch for bubbles escaping from a crack or hole in the float as the air warms up and expands.

[Maxwell-8 4,277]

1 hour ago, gwest_ca said:

Have a vacuum pump with a gauge on it? I turn the carb upside down and put a light vacuum on the inlet. It should hold. Simulates the fuel closing the valve.

 

Stick the float in the refrigerator for a while. Remove and submerge in warm water. Watch for bubbles escaping from a crack or hole in the float as the air warms up and expands.

Looks like one is having a leaking float, and the other one had a float out of adjustment. Thanks!