These are the known mechanical and performance specifications for your 2021 Rieju MR 300 Racing.
Basic Specs

Engine
Displacement299.3 ccm (18.26 cubic inches)
TypeDirect reed valve VForce 4
DetailsSingle cylinder, two-stroke
Max RPM
Compression
Bore/Stroke72.0 x 72.0 mm (2.8 x 2.8 inches)
Valves/Cylinder
FuelingCarburettor
IgnitionDigital CDi
ExhaustPowerCore 2.1- Rieju Powered
Lubrication
CoolingLiquid
Drivetrain
Gearbox6-speed
Final Drive
ClutchMultidisc in oil bath. Magura clutch pump.
Driveline
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity8.90 litres (2.35 US gallons)
Emissions
Chassis
Frame TypeCenter frame in chrome-moly-steel
Rake
Trail
Front SuspensionKYB ø48 mm, AOS system, closed cartridge
Front Travel300 mm (11.8 inches)
Rear SuspensionKYB mono-shock
Rear Travel131 mm (5.2 inches)
Seat
Seat Height960 mm (37.8 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height1235 mm (48.6 inches)
Total Length2145 mm (84.4 inches)
Total Width810 mm (31.9 inches)
Ground Clearance
Wheelbase1480 mm (58.3 inches)
Dry Weight105.0 kg (231.5 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre90/90-21
Rear Tire/Tyre140/80-18
Front BrakesSingle disc. Nissin brake caliper
Front Brake Diameter260 mm (10.2 inches)
Rear BrakesSingle disc. Nissin brake caliper
Rear Brake Diameter200 mm (7.9 inches)
WheelsExcel rim, aluminium radiated
Comments
Spanish brand.