It’s now been nearly 4 months since BS6 emission norms came into effect, and almost all the bikes and scooters sold in India have been updated to meet the stricter regulations. Most recent among these to receive the updates was the TVS Scooty Zest BS6 , which was launched a couple of days ago at Rs 58,640. Like all the BS6 updates we’ve seen so far, this new version is more expensive than its BS4 predecessor, by around Rs 6,000 in this case. And the biggest reason behind these price hikes is the addition of a fuel-injection system. So what exactly is it? And how did bikes work before fuel-injection came into the picture? Let’s take a look: To understand why a fuel-injection (FI) system is needed, we first need to understand its predecessor: the carburettor. Both FI and carburettors do the same job: mixing air and fuel in the correct proportions before it’s sent into the engine. The diagram above shows a carburettor’s layout. Air enters at the top, flows through a narrow con...
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