Kawasaki ATV's

I am very skeptical of anything from Lowes or Tractor Supply...Most have issues right away and very little Mfr support if any at all.

Welcome aboard...it is not normal. Idle too high? Clutch too tight?  Will it shift with engine off?  You can start engine in gear with brake depressed.

You have a blown head gasket

This was the solution

Picked up an essentially new 2022 UT400 with 9 miles on it.  Decided to change the oil because it's probably never been done.  Pulled the dipstick and noticed it was overfull then went and pulled the drain plug and took off the filter and it was like brown water running out.  What should I start checking?