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1.
Check whether the cylinder head is well sealed. If poorly
sealed, replace a new cylinder head or valve.
2.
Check if spark plug hole and valve seat has cracks
3.
Check the cylinder head for deformation. Measure the
flatness with a knife edge ruler and a plug ruler.
Inspection and grinding of valve seat
Clean the carbon deposits in the combustion chamber completely, then smear a thin layer of red printing oil evenly
on the valve seat. Put the valve on the valve seat and knock the valve gently without rotate, later pull out the valve,
if the trace on the valve work surface is intermittent, valve seat need grinding.
First, remove the carbon deposits from intake and exhaust valve seat, second smear grinding agent on the valve
seat, and then suck the valve with the rubber head grinding tool, grind the valve seat.
