Cushman Truckster XD 2018 Owner's Manual page 20

SAFETY
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Start assist fluids in the air intake system can be explosive. Start
assist fluids can cause an uncontrolled engine condition and can
cause engine damage.
14
DO NOT USE START ASSIST FLUIDS
Use caution when you close the tailgate to
prevent injury to fingers or hands.
Owner's Guide