The AHRMA Classic 650 class is perfect for a BSA or Triumph guy looking to move up. And there is alwayd BEARS.
CLASSIC SIXTIES 650: This class is intended for 1960 era 650cc OHV or 883cc sidevalve machines, and like design. All requirements under rule 10.4.3A apply. Among the eligible machines are:
All British and European 650cc OHV machines of the period
Harley-Davidson KH55-cubic-inch sidevalve
Kawasaki W1 (must meet all class requirements, including carburetion)
NOTE: Historic "specials" in Classic Sixties 350, 500 or 650 must be submitted for eligibility.
10.4.3A REQUIREMENTS AND MODIFICATIONS FOR CLASSIC SIXTIES
a) Cylinder bore may not be increase over .080" for singles and .060" for twins.
b) The stroke must remain stock.
c) All machines must use period-type carbs or AMAL
(600, 900 or 1000 series).
d) Gearboxes must be mechanically restricted to 4 speeds.
e) Primary drive may be original-type chain, with chain guard (oiler must not operate). Belt conversions are encouraged, but must be fully enclosed and hidden from view (see rule 9.7.2j).
f) Oil must not be deposited on the track.
g) Brakes must of the period—two-shoe type drum. Later model BSA and Triumph drum brakes are allowed. (Norton Manx may use original four-shoe, 7-inch front brakes.) Minimum wheel diameter is 18 inches; maximum rim width is WM3. OHC machines must use minimum 19-inch wheels, front and rear.
h) Forks and rear shocks (or rigid rear end) must be of the period. Ceriani forks are prohibited.
i) All machines must be GP or Clubman racers in essentially factory-standard trim.
j) Throttles must be self-closing. A handlebar-mounted kill switch is encouraged.
k) Fairings or streamlining are not permitted, except for original fork-mounted number plate-cowlings. The front number plate must be parallel with the front fork angle.
l) All machines must use period-style low exhausts only. Pipes must pass below the gearshift spindle. Velocettes may use a higher, OEM racing configuration exhaust. Twins must use two separate exhaust pipes (no two-into-one exhausts).
NOTE: Classic Sixties classes are run together but scored separately. For 2007, Classic Sixties is under probation and may be eliminated for 2008 if participation does not improve.