Engine
The engine Honda uses is officially billed as a 125, the 52.4mm bore and 57.9mm stroke that adds up to 124.8 cc with a low compression ratio. Thanks to air cooling, this unit remained simple and the design of the bike quite clean, with no unnecessary radiator, ruining the look. The important thing is the fact that the engine is built to last well past the expiration of the warranty.
What you also need to know is that the fuel injection is managed by the company’s Programmed Fuel Injection also known as PGM-FI and the emissions are kept within the ongoing EPA and CARB standards. Speaking of which, the 2018 Honda Grom is rated at outstanding 134 mpg. However, keep in mind that these results spurred from bench tests and not actual riding conditions, nonetheless, it is a remarkable result. The engine is connected to a four-speed manual transmission, and you will not find the CVT or automatic transmission on the Grom.