What are the reasons for excessive NO in exhaust emissions?

[VonRebecca]

The reasons for excessive NO in exhaust emissions include incomplete combustion in the engine combustion chamber, accumulation of excessive carbon deposits in the intake system and engine combustion chamber, and excessively high combustion chamber temperature leading to exhaust emission exceedance. Below are specific solutions to address excessive exhaust emissions: 1. Use carburetor cleaner: It can dissolve the gum solidified on the surfaces of various carburetor components, making it easier to remove with timely cleaning. Currently, there are two types of carburetor cleaners on the market: domestic ones are cheaper but less efficient, while imported ones are more expensive but more efficient. 2. Remove the paper filter element from the air filter and knock off the dust on its surface or blow it clean with compressed air.