manual spark advance造句

With clockwise-running engines, many injuries were sustained, most often dislocated thumbs and broken forearms, if the hand crank kicked back on starting, especially if the car was not properly adjusted before starting, or the person cranking it did not follow correct safety procedures, including fully retarding the manual spark advance, keeping the thumb alongside the fingers instead of around the crank, and pulling the crank upward in a half turn, never in a full circle or pushing down.
It's difficult to find manual spark advance in a sentence. 用manual spark advance造句挺难的