Across
1 & 4: The answer to a Roger Burnett question “Who’s that w*nker on the Bimota?” (9,7)
7:Two legendary initials that went on a two-wheeled racing Proton. (2)
8: Soviet-made GP bikes of the 1960s, nothing to do withYuri Gagarin, despite the name. (6)
10 & 18 Across: Weapons from Birmingham that formed a legendary biking brand. (5,4)
11: Monsieur Poncharal, team owner for years who has finally won at the highest level. (5)
12: See 30 Down
13: BigTerry, famous Loctite Yamaha man. (5)
16: Senor Kissling, winner of the last GP of 1961, at his home circuit of Buenos Aires. (5)
17 & 20 Down: A popular part within the intake track of a two-stroke engine barrel. (4,5)
18: See 10 Across
19: ___ -__ Voddy, popular…