I received mine with a torch plug instead of a ngk has advertised. On the second run after break in, i couldnt start the car. I tought that i had floded the engine, so removed the spark plug, and changed with a ngk, and the car started.
I had a bad jump and rollover, and the aluminium pipe got all bended and crushed. The rear part of the roll cage, the rear shock brace and the rear shock uprights bended also. so i recomend a roll cage, a steel pipe, a better rear shock brace, and aluminium rear uprights.
On another bad rollover, the 2 front tires broke, exactly on the hexagon where the wheel hex hub gets in. A better quality wheel with a metal collar around the hex will be a good upgrade.
I have also a dbxl, stock motor, tgn triple stage dome air filter, losi pipe, and is faster than the king motor with the 30.5cc motor.
Thats my experience so far with the km. Not so good has the mayority of other owners. Hope it helps.