The kicker is, the motor actually shakes "no" in reply, before dying on them!
The scene where Lupin washes up on the beach and regains consciousness in time to see Goemon giving Jigen mouth-to-mouth... in his fundoshi! When Jigen comes to, the first thing he sees is Goemon puckering up for another go, he immediately backpedals and starts spitting!
Followed shortly by Jigen repeatedly shooting at Goemon, who calmly parries each shot with Zantetsuken, before sheathing it. After which he tells Jigen he had to do it about 20 times to revive him!
A few scenes later, while they're discussing the Columbus File and how to jog Fujiko's memory, Jigen walks by in the background, brushing his teeth and gargling mouthwash!
Jigen: (while brushing) "I'm just gonna brush my teeth, my gums, my friggin' esophagus...."
After Lupin and Fujiko run past in the background, while being pursued by Nasarov's men. Goemon pops up in the foreground with Zantetsuken in hand and calmly notes (to viewer) that they seem to be in need of his assistance. Then slides out of frame!