I made it work you need to select all the hinges on the rope and set them to auto brake and set the nm to + inf, then take the orange thing that makes sparkes and connect it to the piston and select the whole engine and make it bigger it will run for a little while.
my mini late mode lIf you click on my account name (above my comment) it will show all my uploads, one ses "mini late model need help" its wheels always bounce when it drives