I changed the battery on a 2009 MP3 250. With the scooter on the stand, I started it up. The bike ran roughly and would die if I tried to rev the throttle.
I checked the plug and wire; they were okay. I inserted the brown key as per the owner's manual; there was no change.
Flustered, I took it off the stand and rolled it back on the driveway. It still idled roughly, yet when I gave it some gas, it moved forward.
What is going on? I thought about a test run, but I'm nervous about it breaking down on the road.
Any ideas, dear friends?