Yamaha blaster running bad

[Jesse ford]

I have a 2001 yamaha blaster, it’s a little difficult to start at first but not to bad, when I ride it in first gear it’s fine until I shift into second gear and give it full throttle it kinda sputters, as if it’s misfiring. It will take off then die down for about a second and keep doing that I checked spark and it seems a little weak, so I pulled the cover off the flywheel and there was this grey watery gunk leaking out, I’m not sure if I should replace stator, coil, or maybe even the reeds