The acronym WOT stands for Wide Open Throttle. WOT implys a state of the moped engine in which the throttle grip is twisted to its maximum angle of twist and the throttle slide of the carburetor is fully open, allowing maximum air and fuel intake. Running your moped at WOT can reveal the results of your tuning efforts, but if tuned wrong, your engine may suffer serious damage such as a seizure. A plug chop requires you to run at WOT.