I have an electric kart stand. Makes the procedure much easier. I fold up some duct tape and put it under the throttle to make it idle. Start the motor with a strap on the tire, then lower the kart to the ground. Move the stand out of the way and get in. All the time hoping the motor doesn’t quit. The duct tape blows away once on the track. Note I am way too old to run along side the kart and jump in!! Just had knee replacement anyway!