[Water Warrior 2]

Welcome and stop looking for really bad stuff to fix. I would suggest some basic maintenance first. Have you changed the oil and oil filter ? Do you know if it was ever changed since new ? That should be your first step in trouble shooting a shifting problem. Oil breaks down and affects the clutch and transmission function. A little TLC should have the bike running much better in jig time.
Did you get an owners manual with the bike ? We have one online here for your convenience and initial knowledge.