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Inspection of valve pipe
Measure the inner diameter of each valve pipe with a dial indicator and record them.
Maintenance limits
：
Air intake
：
φ5.035 mm
Exhaust
：
φ5.035 mm
Note
：
Clean up carbon deposit before measuring pipe
inner diameter.
If replace the valve pipe, the valve seat shall be re-ground and each valve shall be inserted into the pipe to observe
its movement. Finally, the gap between the valve stem and the valve pipe shall be calculated.
Maintenance limits
：
Air intake
：
0.07mm
Exhaust
：
0.08mm
Replacement of valve guide
Heat cylinder head to 100 ~ 150 ℃ in an incubator, take out and prop up the cylinder head (be careful burn ), and
use the valve disassembly tool to shoot the valve tube towards the side of the swing arm chamber.
note
：
Do not damage the cylinder head when
removing the valve guide.
Press the new valve tube into place and rehole the newly installed valve tube after the cylinder head is cooled
.
note
：
When reaming, the reamer shall be coated with
cutting oil. When loading or taking out the reamer,
it shall be rotated.
.
Finally, clean cylinder head with cleaning agent and remove metal chips on the cylinder head by compressed air.
Measure the width of valve seat contact surface
Maintenance limits
：
1.5 mm
If the valve seat is too wide, narrow or dented, grind the valve seat until proper sealing.
When grinding the valve, apply the rubber hose on the electric gun sleeve (tight fit), then put the valve rod on the
rubber hose, apply a little graphite paste used for grinding on the valve seal belt, and then attach it to the valve seat
seal line, start the electric gun, turn the valve, and grind the valve with the seat ring.
After grinding, check whether the sealing line of valve and seat ring has been ground out, otherwise it should be
reground. Replace valve or cylinder head if grinding is not in place.
Cylinder head assembly
1.
Install valve spring seat and oil shield on valve pipe.
2.
After the inlet and exhaust valve lever is coated with
lubricating oil, loaded into the valve pipe. Install valve
spring, valve spring upper seat and the air lock clamp.
Error!
