MR 300

2-stroke1 cylLiquid-cooledElectric start

About the MR 300

Rieju's flagship 300cc two-stroke enduro in its top Pro spec, descended from the GasGas EC 300 and, from 2026, fuel-injected as the MR Pro 300i. For enduro racers and hard-trail riders.

Family: MR Enduro (ex-GasGas EC)
Model years: 2021 – present
Also known as: MR Pro 300, MR 300 Pro, MR Pro 300i, MR 300i Pro, MR300 Pro, MR Racing 300, MR 300 Racing, MR Racing 300i, MR 300i Racing, MR300 Racing, MR300i, MR Hard Enduro 300i
Trims: Hard Enduro (From 2027), Racing (From 2021), Pro

21 sources

Generations

2026 – present

MR 300 Pro (2026); MR 300i Pro (2027)Current

Rieju-redesigned 298cc engine with twin-injector throttle-body fuel injection, counterbalancer, electronic exhaust valve, diaphragm clutch and three maps, mounted further forward in the carried-over chassis; electric start only. Sold as the MR Pro 300i.

Cooling: Liquid-cooled
Starter: Electric start
Gearbox: 6-speed
Fuel: Fuel injection

9 sources

2021 – 2025

MR 300 Pro

Former GasGas EC two-stroke platform (steel frame, Keihin PWK38 carb, electric start with kick backup, Magura hydraulic clutch, KYB suspension) built by Rieju after it bought the line in 2020; 2024 brought an FMF exhaust, simplified wiring and 13/50 gearing.

Engine: 293cc
Cooling: Liquid-cooled
Gearbox: 6-speed
Fuel: Carburettor

7 sources

Year specs

Year

Engine: 295 cc
Bore × stroke: 72 × 72.5 mm
Cooling: Liquid-cooled
Starter: Electric start
Gearbox: 6-speed
Fuel system: Fuel injection
Horsepower: —
Torque: —
Dry weight: 103.5 kg
Wet weight: —
Seat height: 949 mm
Ground clearance: 320 mm
Wheelbase: 1475 mm
Fuel capacity: 9.8 L
MSRP: —

MR 300i Pro 2027 (moto.it): 72 x 72.5 mm as printed, which computes to 295 cc against the stated 299.3 cc. Wikipedia: no kick starter, twin-injector EFI; Racing and new Hard Enduro versions for 2027. fuel_system given as "efi, twin injectors", stored as "efi".

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Gallery

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