What are the reasons why a motorcycle cannot reach high speed?

[DelJulianna]

Motorcycle may not reach high speed due to abnormal compression ratio or improper mixture ratio. Below is an introduction to the knowledge of motorcycle power deficiency: Other reasons: The exhaust pipe is blocked by carbon deposits and dirt, or the front bend of the exhaust pipe is dented; such motorcycles have no problem at low speeds but cannot reach high speeds. Precautions: It is best not to directly rinse the headlight, left and right handrails, ignition switch, exhaust pipe outlet (it is best to block it with something), horn, spark plug, air filter, battery, and other parts with water. These parts have circuits, and getting them wet can cause short circuits or leakage, leading to faults such as lights not working, horn not sounding, failure to start, and weak driving. It is best to clean them with a cloth.