Hero Honda CBZ
The Hero Honda CBZ is a motorcycle launched in early 1999 by Hero Honda, with an original Honda 156.8cc single-cylinder engine. The styling of the bike was a scaled version of the Honda CB series. The CBZ has an over-square engine with a Keihin slide type carburetor with accelerator pump. It has a larger spring operated nozzle to provide a richer fuel air mixture into the engine for better acceleration. An air injection to new emission standards, including Euro1. CBZ. The bike was launched as Hero Honda CBZ in India. It was Powered by an  Original Honda 156.6cc.The engine was based on Honda CRF 150F and it came equipped with TPFC. The term TPFC Means Transient Power Fuel Control system. This system uses a constant-choke carburetor. This Carburetor Play an Major role by increasing the speed of the without any Power lag and Vibration jerks. The throttle valve inside the Carburetor creates the vacuum which operates a diaphragm pump, Which helps to controls the air-fuel ratio inside the engine through a tapered jet. Hero Honda CBZ is first and last bike to get TPFC Technology which gives a reasonable amount of boost  by sending additional fuel into the engine when the throttle is opened. The model went unchanged more or less for five years. In 2004, a new variant called CBZ* (star) was launched with revised graphics and addition of self start, but it does not inspire CBZ enthusiastic which bike due to over enthusiastic use of graphics and significantly higher price compared to its competitors. The bike was discontinued after September 2005. The CBZ was followed after a gap of two years by the CBZ-Xtreme, which shared no parts with the CBZ, and had a 149cc engine and five-speed  gearbox. Brief about TPFC Working. Transient Power Fuel Control system uses its nozzle inside the Carburetor to sprays petrol inside the engine. So, when the rider opens the throttle suddenly. it will give power instantly to rev the engine without any issues, nearly equal to Fuel injection concept but it is powered mechanically, whereas Fuel injection is an electronic concept. This increases the throttle response crisps as like Fuel Injection and the engine feels lively. However, this increases the emission levels and TPFC Accidentally waste some amount of fuel, Because, the accelerator pump inject some extra amount fuel when the  rider applies sudden throttle compensate for lean air-fuel mixture which it generates. Hence, TPFC was consequently discontinued. Later, the Fuel injection technology replaced the carburetor, it performs the same mechanism but drastically improves the fuel efficiency, due to correct level of air-fuel mixture performed electronically instead of old Carburetor mechanism.