market dynamics
Is positioning pin important in motorcycle maintenance?
Release date:2020.08.10

Motorcycle engine as a complex mechanical system, in order to ensure easy maintenance and safe disassembly, many assembly parts are set with positioning pin or limit clamp spring.

This is a trivial thing, so many people ignore it, but in fact, as an integral part of a complex system, every detail has been shaped by thousands of tests, and there is a need for its existence.

Some repairmen said, these small parts do not install nothing, do not affect the car driving. Is this really the case?

What will happen if the locating pin is missing?

If the cylinder positioning pin leakage, will cause cylinder, plug, ring eccentric wear, resulting in the engine power output decline, driving weak, can not run high speed, fuel consumption greatly increased, more serious wear, will also lead to cylinder pad dislocation, resulting in oil leakage.

If the gearbox positioning pin leakage, will cause the box body joint is not in place, the main and vice shaft dislocation, reduce the gear contact area, leading to the oil leakage of the box, gear wear intensified, more serious, will cause gear teeth.

If the crankcase locating pin is missing, the crankshaft power output will be stuck and the operation will be difficult, affecting the engine power performance.


If the positioning pin between the multi-cylinder engine and the gearbox is missing, the starting motor will be toothed.

What will happen if the locating pin is wrongly installed?

If the selection of positioning pin is too long, it will affect the sealing performance of relevant parts of the engine, resulting in crankcase and gear box oil leakage, cylinder head, the gasket between the cylinders burn through, the engine is difficult to start, driving weak.

If the cylinder head positioning pin is too long, it will lead to loose CAM operation, noise, engine weak.

If the locating pin is too fine or too small, the locating function will be lost, resulting in various faults of the missing locating pin, and the fixing screw cannot be fastened.

If the oil channel positioning pin is misinstalled or too thick, it will block the oil channel, affect the lubrication effect, cause abnormal wear of the engine, affect the engine life and power output.

In addition, positioning pins have their own specifications, the replacement needs to be in strict accordance with the relevant standards, not at will to change the material, or zhang Guanli dai!