Hello Everyone - First post here - I will search the forums to see if this has already been addressed.
I have a D140 Mower which I purchased with just 8 hours on it.
When driving the mower I noticed that it seems to run the cleanest at full throttle. Below the notch, it seems to stutter or oscillate. The only thing I noticed was the air filter was filthy so I ordered a tune up kit and changed the air filter, fuel pump and fuel filter. Seems to run better but still cleanest at full throttle. Also - I was under the impression that it sat for some time so I drained the fuel cell and replaced it with new fuel.
Is this the norm for this machine? Or is there something else I should check?
EDIT: I did also check the plugs - both are firing just fine.
I did just read that this mower likes higher octane fuel... could be my next item to try.