The air-cooled four-stroke is perfectly acceptable for a 125 and will have you coasting along at 55mph with no problems, even getting up to an indicated 68mph with a long, flat straight. The power is quite flat, however, with very even power and noise output throughout the rev range. Change gear without nearly redlining the engine and you’ll find yourself in an underpowered dead zone without much in the way of acceleration. Not untypical for a 125, but slightly conflicting with the bike’s sporty appearance.