Yamaha R125
15 hp, 124 cc, 313 lbs2019
Yamaha R6
123 hp, 599 cc, 417 lbs2015 - 2016
EngineYamaha R125Yamaha R6
Displacement124 cc599 cc
Max power15 hp (@10 000 RPM)123 hp (@14 500 RPM)
Max torque8 lb ft (@8 000 RPM)47 lb ft (@10 500 RPM)
Redline10 000 RPM16 000 RPM
Idling speed1 200 RPM1 200 RPM
ManagementFuel InjectionFuel Injection
LayoutSOHC SingleDOHC Inline-4
Compression11.20:113.10:1
Oil capacity1.14 quart3.22 quart
Oil type10W40, Yamalube 10W40, Shell Rotella 10W40
Spark plug typeNGK CR10EK
CoolingLiquidLiquid
Valves416
Bore52.0 mm67.0 mm
Stroke58.6 mm42.5 mm
Weight to power20.87 lbs/hp3.39 lbs/hp
Power to weight119 hp/2500lbs737 hp/2500lbs
Battery type12V 5.5AhYTZ10S
GearboxYamaha R125Yamaha R6
TypeSequentialSequential
ClutchWetWet
DriveChainChain
Chain type
Gears count66
Primary ratio3.0422.073
Final drive3.422.813
1. gear2.833 (24 mph)2.583 (78 mph)
2. gear1.875 (37 mph)2.0 (101 mph)
3. gear1.364 (51 mph)1.667 (121 mph)
4. gear1.143 (60 mph)1.444 (140 mph)
5. gear0.957 (72 mph)1.286 (157 mph)
6. gear0.84 (82 mph)1.15 (176 mph)
ChasisYamaha R125Yamaha R6
Frame typeSteel deltaboxAluminium Deltabox
Front susp.KYB 41mm USD, 5.12 in travelUSD, dia 41mm, 4.53 in travel
Rear susp.Swingarm monoshock, 4.49 in travel4.72 in travel