Shop Swaps a 300cc Engine Into a Honda Grom, Tripling Output

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California's Steady Garage has revealed a Honda Grom build that replaces the stock 125cc engine with a 300cc unit from a Honda CBR300. The team used a Chimera Engineering mounting kit to fit the larger engine into the original frame and swingarm, paired with a Yoshimura RS-5 exhaust borrowed from a CBR600RR, roughly tripling the Grom's original output.