Former Speedway World Champion Billy Hamill and Rob Weaver each took a turn atop the podium in the headlining Sound Of Thunder races in AHRMA competition at Willow Springs on April 27 and 28.

Hamill took his Buell 1125R to the win in Saturday’s contest, holding off Paul Vogel’s Ducati by a mere 0.932 seconds at the line after eight laps of the classic 2.5-mile circuit. John Ulrich was third on his Yamaha TZ250, ahead of Alan Brown on another Ducati.

Hamill returned to the podium on Sunday, but this time it was good enough only for third place. Sunday’s Sound of Thunder race belonged to Weaver, who took his turn holding off Vogel. The Ducati rider made it even closer to the top of the podium this time around, crossing the line 0.720 seconds behind Weaver. Hamill was just a second further back, but well clear of Max Cappellari and his Ducati.

Hamill piled up a stack of podiums over the weekend, with a second in Battle Of Twins Formula One and a third in Battle Of Twins Formula Three on Saturday, and wins in CB160 and 200cc GP, and a second in Battle Of Twins Formula Three on Sunday.

Weaver also notched the Battle of Twins Formula One win on Sunday over Vogel, while Ulrich took the Open Two-Stroke win on Sunday.

CPL SYSTEMS AHRMA NATIONAL ROADRACE SERIES WILLOW SPRINGS INTERNATIONAL RACEWAY ROSAMOND, CA APRIL 27-28, 2013

RESULTS: SATURDAY

CB160 (all on Honda CB160): 1. Ralph Hudson 2. Mark Hunter 3. Marcelo Doffo 4. Damian Doffo 5. Dustin Johnson 6. Daniel Giles

CLASS C FOOT SHIFT: 1. Fred Mork (Norton) 2. Ted Van Doorn (Matchless)

CLASS C HAND SHIFT: 1. Ralph Wessell (Indian)

SIDECAR F1: 1. Chris Wood 2. Bernard Juchli 3. Phil Wood 4. Harald Skjorshammer 5. Donn Sayre 6. Steven Stull

SIDECAR F2: 1. Giorgina Gottlieb 2. Bobette Burdick 3. Scott Lane 4. Heidi Neidhoefer 5. Hans Schulz

SIDECAR VINTAGE: 1. Larry Campbell 2. William Becker

200cc GP: 1. Stephen Gillen (Hon) 2. Ralph Hudson (Hon) 3. Mark Hunter (Hon) 4. Marcelo Doffo (Hon) 5. Dave Janiec (Hon) 6. Damian Doffo (Hon)

FORMULA 125cc: 1. Dennis Micaletti (Bultaco)

CLASSIC SIXTIES 650cc: 1. Ted Van Doorn (Tri) 2. Luke Conner (H-D) 3. Gary Swan (BSA) 4. Mike Proffitt (BSA)

PRE-1940: 1. Fred Mork (Norton) 2. Ralph Wessell

BATTLE OF TWINS FORMULA ONE: 1. Scott Jennings (Duc) 2. Billy Hamill (Buell 1125R) 3. Rick Carmody (Duc) 4. Mickey Fimbres (Kaw) 5. Alan Brown (Duc) 6. Murrae Haynes (Bue)

SOUND OF SINGLES TWO: 1. Mike Blankenship (KTM) 2. Cody Burton (MZ) 3. Patrick Wilkening 4. Scott Fabbro (Hon) 5. Robert Helmering (Hon)

250cc GP: 1. David Roper (Yam) 2. Jeff Elings (H-D) 3. Stephen Gillen (Hon) 4. Ralph Hudson (Bultaco) 5. Mark Hunter (Hon) 6. Dave Janiec (Hon)

SPORTSMAN 350cc: 1. Ari Henning (Hon) 2. Denis Kerechuk (Hon) 3. Kevin Hipp (Hon) 4. Patrick Wilkening (Hon) 5. Kurt Hipp (Hon) 6. Dennis Parrish (Hon)

NOVICE HISTORIC PRODUCTION LIGHTWEIGHT: 1. Peter Treuherz (Hon) 2. Derek Stoot 3. Melissa Clemens

THRUXTON TRANSATLANTIC CHALLENGE: 1. Heath Cofran (Tri) 2. Mike Blankenship (Tri) 3. W.W. Bolton (Tri) 4. Darryl Tomlinson (Tri) 5. Gregory Glevicky (Hon) 6. Paul Canale (Tri)

BATTLE OF TWINS FORMULA TWO: 1. Rick Carmody (Duc) 2. Brian Herzfeldt (Kaw) 3. Sean Ianson (Suz) 4. Mickey Fimbres (Kaw) 5. Josh Duhon (Suz) 6. Lloyd Johnson (Duc)

VINTAGE SUPERBIKE HEAVYWEIGHT: 1. Joe Weir (Suz) 2. David Crussell (Kaw) 3. Jim Dobson (Hon) 4. Dennis Parrish (Hon) 5. Courtney Allaert (Kaw) 6. David Ehrhart (Suz)

FORMULA 750cc: 1. Brian Filo (Yam) 2. Jeff Law (Norton) 3. Robert Helmering (Hon) 4. Andrew Simsak (BMW) 5. Andrew Cowell (Tri) 6. Scott Fabbro (Norton)

SPORTSMAN 750cc: 1. Anthony Starros (Yam) 2. Jamie Linxwiler (Tri) 3. Daryl Foster (Yam)

BEARS: 1. Ivan Messina (BMW) 2. Glenn Campbell (BMW) 3. Luke Conner (Tri) 4. Larry Campbell (BMW) 5. Vincent Balch (BMW) 6. Dennis Donahoe

500cc PREMIER: 1. Jeff Elings (Matchless)

500cc GP: 1. James Neuenburg (H-D) 2. Michael Lohrman (Tri) 3. Jeff Tulinius (BSA)

OPEN GP: 1. David Crussell (Kaw)

VINTAGE SUPERBIKE MIDDLEWEIGHT: 1. Ed Milich (Cagiva) 2. Michael Gilkey (BMW) 3. Greg Tomlinson (Tri) 4. Courtney Allaert (Kaw)

SOUND OF THUNDER: 1. Billy Hamill (Buell 1125R) 2. Paul Vogel (Duc) 3. John Ulrich (Yam TZ250) 4. Alan Brown (Duc)

NEXT GEN SUPERBIKE: 1. Russ Granger (Hon) 2. Brian Filo (Hon)

SOUND OF SINGLES ONE: 1. Cody Burton (MZ) 2. Richard Downer (KTM) 3. Connally Field (Yam)

FORMULA 500cc: 1. Jeff Elings 2. David Crussell (Kaw) 3. Jamie Linxwiler (Yam) 4. Josh Hartley (Yam)

SPORTSMAN 500cc: 1. Ari Henning (Hon) 2. Andrew Mauk (Hon) 3. Daryl Foster 4. Denis Kerechuk (Hon) 5. Gary Swan (BSA)

VINTAGE SUPERBIKE LIGHTWEIGHT: 1. Ed Milich (Moto Guzzi) 2. Scott Fabbro (Hon) 3. Fabrizio Mascioni (Hon) 4. Brady Walker (Yam)

FORMULA 250cc: 1. Jeff Elings (Yam) 2. Dave Janiec (Hon) 3. David Crussell (Kaw)

BATTLE OF TWINS FORMULA THREE: 1. Charles Burnett (Hon) 2. Lloyd Johnson (Duc) 3. Billy Hamill (Suz) 4. Zack Courts (Duc) 5. Michael Gougis (Suz) 6. Paul Canale (Tri)

MOTARD: 1. Mike Blankenship (KTM) 2. Richard Downer (KTM)

FORMULA VINTAGE: 1. Dennis Parrish (Hon) 2. Courtney Allaert (Kaw) 3. Derek Stoot 4. David Crussell (Kaw)

350cc GP: 1. James Neuenburg (H-D) 2. David Roper (H-D) 3. Jason Lindquist 4. Tim Mings (Hon) 5. Wendy Newton (Duc) 6. Charles Stark (Kaw)

SUNDAY:

CB160 (all on Honda CB160): 1. Billy Hamill 2. Mark Hunter 3. Stephen Gillen 4. Ralph Hudson 5. Marcelo Doffo 6. Damian Doffo

CLASS C FOOT SHIFT: 1. Fred Mork (Norton)

CLASS C HAND SHIFT: 1. Ralph Wessell (Indian)

SIDECAR F1: 1. William Becker 2. Donn Sayre 3. Bernard Juchli 4. Chris Wood 5. Steven Stull 6. Phil Wood

SIDECAR F2: 1. Giorgina Gottlieb 2. Bobette Burdick 3. Scott Lane 4. Hans Schulz 5. Heidi Neidhoefer

SIDECAR VINTAGE: 1. Larry Campbell

200cc GP: 1. Billy Hamill (Hon) 2. Stephen Gillen (Hon) 3. Jeff Henise (Yam) 4. Lorraine Crussell (Hon) 5. Dave Janiec (Hon) 6. Marcelo Doffo (Hon)

FORMULA 125cc: 1. Dennis Micaletti (Bultaco)

CLASSIC SIXTIES 650cc: 1. Ted Van Doorn (Tri) 2. Gary Swan (BSA) 3. Mike Proffitt (BSA)

PRE-1940: 1. Fred Mork (Norton) 2. Ralph Wessell

BATTLE OF TWINS FORMULA ONE: 1. Rob Weaver (EBR 1190RS) 2. Paul Vogel (Duc) 3. Rick Carmody (Duc) 4. Max Cappellari (Duc) 5. Murrae Haynes (Bue)

OPEN TWO-STROKE: 1. John Ulrich (Yam TZ250) 2. David Crussell (Yam TZ750)

SOUND OF SINGLES TWO: 1. Mike Blankenship (KTM) 2. Cody Burton (MZ) 3. Patrick Wilkening 4. Scott Fabbro (Hon) 5. Robert Helmering (Hon)

250cc GP: 1. David Roper (Yam) 2. Jason Lindquist (Hon) 3. Stephen Gillen (Hon) 4. Jeff Elings (H-D) 5. Ralph Hudson (Honda) 5. Robert Bryson (Bultaco)

SPORTSMAN 350cc: 1. Zack Courts 2. Kevin Hipp (Hon) 3. Kurt Hipp (Hon) 4. Dennis Parrish (Hon) 5. Gary Swan (Hon) 6. Karl Kosling

NOVICE HISTORIC PRODUCTION LIGHTWEIGHT: 1. Peter Treuherz (Hon) 2. Kerri Kress 3. Melissa Clemens

BATTLE OF TWINS FORMULA TWO: 1. Rick Carmody (Duc) 2. Brian Herzfeldt (Kaw) 3. Josh Duhon (Suz) 4. Lloyd Johnson (Duc) 5. Murrae Haynes (Bue) 6. Peter Treuherz (Suz)

VINTAGE SUPERBIKE HEAVYWEIGHT: 1. Jim Dobson (Hon) 2. Joe Weir (Suz) 3. Dennis Parrish (Hon) 4. Courtney Allaert (Kaw) 5. Yoshi Kosaka 6. David Ehrhart (Suz)

FORMULA 750cc: 1. Brian Filo (Yam) 2. Jeff Law (Norton) 3. Robert Helmering (Hon) 4. Tom Kullen (Norton)

SPORTSMAN 750cc: 1. Anthony Starros (Yam) 2. Jamie Linxwiler (Tri) 3. Daryl Foster (Yam)

BEARS: 1. Ivan Messina (BMW) 2. Glenn Campbell (BMW) 3. Dennis Donahoe 4. Vincent Balch (BMW) 5. Tom Kullen (Norton) 6. Luke Conner (Tri)

500cc PREMIER: 1. Jeff Elings (Matchless)

500cc GP: 1. Michael Lohrman (Tri)

OPEN GP: 1. David Crussell (Kaw)

VINTAGE SUPERBIKE MIDDLEWEIGHT: 1. Michael Gilkey (BMW) 2. Courtney Allaert (Kaw)

SOUND OF THUNDER: 1. Rob Weaver (EBR 1190RS) 2. Paul Vogel (Duc) 3. Billy Hamill (Buell 1125R) 4. Max Cappellari (Duc)

NEXT GEN SUPERBIKE: 1. Russ Granger (Hon) 2. Brian Filo (Hon)

SOUND OF SINGLES ONE: 1. Alan Brown (Hus) 2. Cody Burton (MZ) 3. Connally Field (Yam) 4. Richard Downer (KTM)

FORMULA 500cc: 1. Jeff Elings 2. David Crussell (Kaw) 3. Jamie Linxwiler (Yam) 4. Josh Hartley (Yam)

SPORTSMAN 500cc: 1. Andrew Mauk (Hon) 2. Daryl Foster 3. Karl Kosling 4. Denis Kerechuk (Hon)

VINTAGE SUPERBIKE LIGHTWEIGHT: 1. Connaly Field 2. Scott Fabbro (Hon) 3. Fabrizio Mascioni (Hon) 4. Brady Walker (Yam)

FORMULA 250cc: 1. Jeff Elings (Yam) 2. David Crussell (Kaw)

BATTLE OF TWINS FORMULA THREE: 1. Charles Burnett (Hon) 2. Billy Hamill (Suz) 3. Michael Gougis (Suz) 4. Paul Canale (Tri) 5. Peter Treuherz (Suz) 6. Jon Paul De La Houssaye (Suz)

MOTARD: 1. Mike Blankenship (KTM) 2. Alan Brown (Hus)

FORMULA VINTAGE: 1. Dennis Parrish (Hon) 2. Courtney Allaert (Kaw) 3. Robert Meidel (Kaw) 4. Derek Stoot

350cc GP: 1. David Roper (H-D) 2. Ralph Hudson (Hon) 3. James Neuenburg (H-D) 4. Jason Lindquist 5. Tim Mings (Hon) 6. Mike Muzzy