CYLINDER, PISTON AND EXHAUST VALVE 6-7
• Fit the piston ring into the cylinder and measure the piston
ring end gap with a thickness gauge.
Piston ring end gap
Service Limit: 0.80 mm (0.031 in)
• Measure the piston ring free end gap.
Piston ring free end gap
Service Limit: 3.2 mm (0.13 in)
EXHAUST VALVE INSPECTION
• Remove carbon deposits from the exhaust valve and valve
guide.
• Inspect the exhaust valve and valve guide for wear and
scratches.
• Inspect the exhaust valve shaft and arm for damage.
• Inspect the exhaust valve breather hoses for clogging with tar.
If clogging is found, clean up it.
NOTE:
Using several brands of engine oil may cause tar to drip from the
breather hoses.
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