AHRMA.org
 "Your Guide to Vintage Racing in the United States"


Join AHRMA
2009 Membership Application
(PDF File)

New Programs to Strengthen & Ensure Our Future

2009 AHRMA Handbook
(PDF File)
Home
Up
Vintage Road Racing
Modern Road Racing
VMX
PVMX
Dirt Track
Observed Trials
Cross Country

Series
Sponsors
Click logo


Jakes Garage



Legends of
Motocross
Group




"Penton Owners Group"




Contingency
Sponsors
Click logo





Class Sponsors
 are now found
 on  the preview
 and results pages
for the respective
 discipline.

For Information on
how to become a
sponsor, click here.
 

Regional Sites:
 Great Lakes
 North Atlantic
Midwest
Northwest Post-Vintage
Northwest Vintage
Rocky Mountain
South Central
Southeast Dirt Track
 Southeast
Southeast Trials
Southwest

Useful Links:
 Haynes & Clymer
Repair Manuals

 

Modern Road Racing


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

MODERN ROADRACE CLASSES

Sound of Singles® (SOS)

bulletSuper Mono 2: Four-valve four-strokes to 510cc and two-valve four-strokes to 610cc.
bulletSuper Mono™: Unlimited displacement four-strokes.
bulletProduction 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.
bulletTwo-Stroke Singles: Two-stroke singles to 550cc.

Battle of Twins® (BOT)

bulletFormula 3 Twins: Pushrod OHV twins to 1000cc, OHC 2- or 3-valve to 800cc and OHC liquid-cooled 4-valve to 650cc.
bulletFormula 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.
bulletFormula 1 Twins: No displacement limits. Engine modifications are unlimited, except on  water-cooled 4-valve twins over 900cc.
bulletOpen 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.
 

Click here for schedule.

Click here for entry forms and other info.

Back to Top
 
 

Copyright 1987-2009  AHRMA, Ltd. ~ Site Design by TRPro.com
Battle of Twins®, Sound of Thunder®, Sound of Singles®, BEARS® and Battle of Legends®
are registered trademarks of the American Historic Racing Motorcycle Association.