AHRMA's Singles, Twins & Triples

 

 

 


Scott Smallwood on his little Honda RS125 in Sound of Singles Two-Stroke. (Photo: Matt Benson)

MODERN ROADRACE CLASSES

Sound of Singles® (SOS)

  • Super Mono 2: Four-valve four-strokes to 510cc and two-valve four-strokes to 610cc.
  • Super Mono™: Unlimited displacement four-strokes.
  • Production Singles. Single-cylinder four-stroke motorcycles that are or were available for sale to the general public and intended for street use in the U.S.
  • Two-Stroke Singles: Two-stroke singles to 550cc.

Battle of Twins® (BOT)

  • Formula 3 Twins: Pushrod OHV twins to 1000cc, OHC 2- or 3-valve to 800cc and OHC liquid-cooled 4-valve to 650cc.
  • Formula 2 Twins: Pushrod OHV machines to 1250cc, liquid-cooled OHC to 750cc, air-cooled 2-valve to OHC to 1000cc and air-cooled 4-valve to 1000cc.
  • Formula 1 Twins: No displacement limits. Engine modifications are unlimited, except on  water-cooled 4-valve twins over 900cc.
  • Open Two-Stroke: Air-cooled machines to 500cc, water-cooled motorcycles with tubular frame to 400cc and modern 250cc GP type machines.

Sound of Thunder®

Unlimited displacement four-stroke singles; 4-valve demo twins to 1000cc, OHC twins to 1100cc and pushrod twins to 1350cc; three-cylinder machines to 1000cc; and twin-rotor rotary engines.

Download PDF of 2008 Handbook


AHRMA 2008 Michigan Engineering
Historic Cup Roadrace Series

Date Location
Round
Feb.28 Roebling Road Raceway, Bloomingdale, GA
(Feb. 27, AHRMA-run practice day)
Preview, Track & Local Info

 
1

 

 

March 3-4 Daytona International Speedway
Daytona Beach, FL
(Tech Day, March 2) (Running AMA Track)
Preview, Events Info
 
2-3

 

April 12-13

Corsa Moto Classica
Willow Springs International Raceway, Rosamond, CA 
(April 11, AHRMA-run practice day)
Preview
 

4-5
May 17-18

Talladega GP Raceway, Talladega, AL(May 16, AHRMA-run practice day)
Preview
Download Poster
 

6-7
June 14-15 Road America, Elkhart Lake, WI
(June 13, Track-run practice day)
Preview
Download Poster
 
8-9
June 21-22

Grattan Raceway Park, Grattan, MI
(June 20, Track-run practice day)
Preview
Download Poster

 

10-11
July 26-27

AMA Vintage Motorcycle Days, Mid-Ohio Sports Car Course, Lexington, OH
(July 25, AHRMA-run practice day)
Preview
 

12-13
Sept. 6-7 Bonneville Vintage GP, Miller Motorsports Park, Tooele, UT
(Sept. 5, AHRMA-run practice day)
Preview 
Download Poster
14-15
Sept. 13-14 Sandia Classic, Sandia Motorsports Park, Albuquerque, N.M.
(Sept. 12, AHRMA-run practice day)

Preview
Download Poster
 
16-17
Oct. 18-19 Barber Vintage Festival, Barber Motorsports Park, Birmingham, AL
(Oct. 17, AHRMA-run practice day)
Preview
 
18-19

Best 10 finishes count toward championship. Minimum of 2 events needed to qualify.

2008 National Points Standings pdf | Points Keeper: Stan Miller

For additional information, check these pages:
News Flashes | Entry Information Page