Historical clue formulations

• Road hog? — 2023-04-09
• Certain hog — 2022-12-16
• Road hog? — 2021-02-10
• Heavy cycle — 2011-12-09
• Road hog? — 2010-12-03
• Motorcycle maker — 1996-04-03
• Yamaha rival — 1994-01-05