"Ultimate R/C Off-Roader: Mini 4x4 with 0.0175-Liter Four-Cylinder Engine"

YouTuber JohnnyQ90 has swapped the V-twin engine in an old RC 4x4 for a 17.5-cc four-cylinder unit with a three-speed manual transmission, requiring reconfiguration of the car's cooling system, exhaust routing, and wiring. The Cison engine costs around $1,000 without a transmission, while the 3D-printed aluminum case gearbox costs about $450. The tiny off-road vehicle, controlled via remote control, impressively scales curbs and conquers small obstacles, offering a unique experience with its rumbling four-cylinder soundtrack.