If you want to have a longer engine life after maintenance, you must choose regular parts, and the quality of parts is directly related to the maintenance effect.

The procedure of changing is as follows

1. Clean the dust outside the engine, remove the carburetor, exhaust pipe and other external accessories.

2. Open the cylinder head to check the valve clearance, determine the ignition time, and check the wear of the rocker arm, camshaft, and small chain.

3. Remove cylinder head, clean up carbon deposit, check valve seal condition, grind or replace new parts if necessary.

4. Remove cylinder block, piston check for wear and check crankshaft clearance.

5. Insert the piston ring into the piston and adjust the position of the piston ring.

6. Load the piston, sleeve cylinder, it is worth noting that the positioning pin must be installed as the number can not be ignored.

7. Load the cylinder head and it is best to replace the new cylinder head pad to ensure the best sealing condition.

8. Load the camshaft, and adjust the tightness of the small chain and the valve clearance.

9. After the carburetor and exhaust pipe are installed, the engine idling test should last for more than five minutes to ensure that the cylinder block is fully lubricated and properly cold ground.

10 ignition test, remember not to mix the accelerator, it is best to let the engine idle for more than 10 minutes.

Select the quality of the parts, through the above operations can greatly improve the maintenance effect. There are some details that must be paid attention to, use as little sealant as possible, apply some new lubricating oil as far as possible when the cylinder is loaded, and it is best to use new cushions and circlips.

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