Manitoba Roadracing Association (MRA) race classes
Engine Displacement (must be OE in bore and stroke)
a) Two cylinder: 850cc maximum
b) Three cylinder: 675cc maximum
c) Four cylinder: 636cc maximum
Engine displacement is unlimited, retaining stock bore and stroke.
a) 0-250cc two-stroke water-cooled “racing” engines maximum of two cylinders;
b) 0-450cc two-stroke air-cooled maximum of two cylinders;
c) 0-500cc two-stroke single cylinder;
d) 0-450cc water-cooled production based “street” crankcases unlimited cylinders;
e) 0-650cc four-stroke liquid-cooled two cylinders;
f) Unlimited displacement four-stroke single cylinder;
g) 0-999cc 2 valve per cylinder desmodromic, air-cooled twins;
h) 0-1300cc air-cooled twins with pushrod activated valves (ie. Buells).