Kawasaki vn1500 2nd gear jumping out - Vulcan 1500 Classic kawasaki Motorcycles

Hi, make sure your lever is adjusted to your foot. You can turn the linkage arm adjuster up or down to get a better throw on the lever. If you don't wear boots when riding, this is always a problem on a Kawasaki due to the positive neutral finder. The fist question you get when you call the Kawasaki Hotline is if the rider wears boots or not.
If adjusting the lever doesn't help the problem is internal. Under the gear change cover the items to check would be the pawl that rotates the drum and the detent arm and spring. If the edge of the pawl is worn, it won't move the drum far enough. If the detent arm or spring isn't working, it will want to drop into a false neutral. I've had very good luck by removing all of the parts and polishing them, removing any burrs and replacing the springs. If the problem isn't found under the cover in the gear change area then the only other solution is to pull the motor apart and inspect the tranny itself.