Most Grom owners would be satisfied with their machine’s 125cc powerplant. Others, however, are more adventurous. Vasily Builds initially put a 200cc motor in his Grom, but after one long stint going flat out at 90 miles per hour, the engine he initially put in went kaput.
The suspected failure point was with the piston of the 200cc motor. The engine lost compression which was a terrible and horrible sign for its future and later in the video, we see Vasily opening it up and revealing a big gaping hole punched into the piston.
