The Hero Impulse is powered by the same 150-cc, 4-stroke engine that we all have experienced and fallen in love with, in the Unicorn. The engine is extremely smooth with amazing refinement levels that can teach Bajaj and TVS a lesson or two. The muted exhaust note that most of us like in the Unicorn just doesn't go well with the hardcore nature of the Hero Impulse. A deeper groan and a sportier note would have perfectly suited the bike's personality. That aside, it is hard to find any fauly with this engine expect the fact that Hero Moto could have given the Impulse a bigger and more powerful engine to match is ruggedness.
Thanks and Regards,