My neighbor gave me his MTD lawn tractor when he moved away a couple years ago. It sat for several years because the dog had ripped the wiring out of it. The fuel in the carb bowl looked like mucus. The engine is a model 422707 type 1510.
At that time, I cleaned out the carb and have used it since. It runs OK but not what I would call great and it is somewhat temperamental.
Yesterday I replaced the starter gear and drive clutch after it jammed for the second time and decided to also freshen up the carb for the season with an overhaul kit and a soaking in cleaner. It runs better but still not as well as it should.
Here are my questions because I'm really not much of a carb guy. I've noticed that it always has and still does have fuel spattering out of the angled brass tube that comes out of the bowl area above the throat of the carb. Is this a bowl vent or is it actually supposed to be a part of the fuel delivery system? The fuel dribbles out of it and onto the throttle plate below.
When I advance the throttle up, a mass of fuel splatters out of this tube and the engine bogs for a moment and then regains its speed.
My plugs look like the engine is running rich with black soot on them and it smells rich when running. The soot will begin to appear after only a few minutes of run time after being cleaned. It of course gets heavier the longer it runs. The engine does not appear to be burning oil.
The idle mixture screw has no affect on how the engine runs whether it's all the way in or backed out.
I didn't change the float level. The guy at the mower shop told me that it should hang parallel to the top carb plate when held upside down and it did. I don't have any actual measurements of where it should be set.
The kit did come with a new needle valve for the float but not a new seat.
The plugs probably have about ten hours on them. I haven’t checked the strength of the spark because I’ve been suspicious of this carb all along.
I hope this is enough information to help. Thanks much.
At that time, I cleaned out the carb and have used it since. It runs OK but not what I would call great and it is somewhat temperamental.
Yesterday I replaced the starter gear and drive clutch after it jammed for the second time and decided to also freshen up the carb for the season with an overhaul kit and a soaking in cleaner. It runs better but still not as well as it should.
Here are my questions because I'm really not much of a carb guy. I've noticed that it always has and still does have fuel spattering out of the angled brass tube that comes out of the bowl area above the throat of the carb. Is this a bowl vent or is it actually supposed to be a part of the fuel delivery system? The fuel dribbles out of it and onto the throttle plate below.
When I advance the throttle up, a mass of fuel splatters out of this tube and the engine bogs for a moment and then regains its speed.
My plugs look like the engine is running rich with black soot on them and it smells rich when running. The soot will begin to appear after only a few minutes of run time after being cleaned. It of course gets heavier the longer it runs. The engine does not appear to be burning oil.
The idle mixture screw has no affect on how the engine runs whether it's all the way in or backed out.
I didn't change the float level. The guy at the mower shop told me that it should hang parallel to the top carb plate when held upside down and it did. I don't have any actual measurements of where it should be set.
The kit did come with a new needle valve for the float but not a new seat.
The plugs probably have about ten hours on them. I haven’t checked the strength of the spark because I’ve been suspicious of this carb all along.
I hope this is enough information to help. Thanks much.