Thread: Sidecar racing
View Single Post
Old June 14th, 2018, 05:27 PM   #17
CC Cowboy
ninjette.org certified postwhore
 
CC Cowboy's Avatar
 
Name: Whodat
Location: Ware Is.,MA
Join Date: Jan 2009

Motorcycle(s): I pass the wind!

Posts: A lot.
MOTM - Mar '13, Jun '14
a) VINTAGE SIDECAR (SC1): Front-exit sidecars. Air-cooled, one- or two-cylinder, two- or four-stroke, built before December 31, 1967. Two-stroke piston-port only, 350cc maximum. Four-stroke, 650cc overhead valve and 750cc sidevalve maximum. Carbureted only. Fuel injection, supercharging and turbocharging are prohibited. No short-stroke engines permitted. Stock stroke length and stock bore with allowable overbore (see 9.7.2.c). Motorcycle-based powerplants only.

b) STOCK PRODUCTION SIDECAR (SC2): Front-exit sidecars. Air-cooled, one- or two-cylinder, two- or four-stroke engines, built before December 31, 1972. Two-stroke, piston-port only, 500cc maximum. Four-stroke, 750cc maximum. Carbureted only, 34mm maximum venturi. Carburetor restrictor plates, fuel injection, supercharging and turbocharging are prohibited. Stock stroke with crankshafts phased as per the manufacturer’s intent and stock bore plus allowable overbore with allowable overbore (see 9.7.2.c). Stock valve sizes. Motorcycle-based powerplants only.

c) LOST ERA SIDECAR (SC3): Front- or rear-exit sidecars. Air-cooled, one-, two- or three-cylinder two-stroke, one-,two-, three- or four-cylinder four-stroke engines, built before December 31, 1977. Two-stroke, piston-port or reed-valve, 550cc maximum. Four-stroke, 836cc maximum, two valves per cylinder. Altered stroke and/or re-phased crankshafts beyond the manufacturer’s intent are permitted. Supercharging and turbocharging are prohibited. Stock bore plus allowable overbore must be within the maximum displacement allowed. Motorcycle- and snowmobile-based powerplants only.

d) FORMULA CLASSIC SIDECAR (SC4): Front- or rear-exit sidecars. Motorcycle-based powerplants: Four-stroke twins (1300cc maximum, plus allowable overbore), four-stroke multis (1100cc, including overbore) or two-stroke (750cc, plus overbore). Automotive-based powerplants: Two-stroke (900cc, including overbore) or four-stroke (1300cc, including overbore).

https://www.ahrma.org/ahrma_pdfs/Z-2...ndbook_web.pdf
__________________________________________________
If everything seems under control; you're just not going fast enough!
CC Cowboy is offline   Reply With Quote