The quality characteristics of motorcycle parts are determined by the product specifications, performance and structure, and affect the applicability of the product, is the design of the technical requirements and information transmitted to the process, manufacturing and inspection, it contains dimensions, limits and tolerances, function, life, interchangeability, environmental pollution, personal safety and the implementation of relevant government regulations and standards, etc. This specification applies to the company's two-wheeled motorcycles and two-wheeled mopeds and electric bicycles, motorcycle parts importance and the importance of the project classification.

The importance of parts and components grading based on the importance of the project of parts and components, divided into critical parts, important parts and general parts, the level symbols in turn with A, B, C said.

Critical parts A level: in the parts have one or more items of importance to A level, then the parts are critical parts. In the A-level parts are allowed to appear B-level and C-level items.

Important parts B level: in the parts have one or more items of importance to B level, but can not have A level items of the parts for the important parts, in the B level parts are allowed to appear C level items.

General C-level parts: in parts without A-level and B-level projects, and the use of the product performance and life of the impact is not significant to cause the use of units or personal complaints parts. In the C-level parts are not allowed to appear in the A-level and B-level items.

Importance grading content generally includes.

a, safety, environmental protection requirements.

b, the use of performance structure requirements.

c, reliability, service life and interchangeability requirements.

d, material properties and handling requirements.

e, welding and casting, forging regulations; and

f, size, limits and fits, shape and position tolerances and surface roughness requirements.

g, shape, appearance requirements;.

h, cleanliness requirements.