Suzuki RM250 - Cylinder Head, Cylinder and Piston; Cylinder Head; Cylinder; Piston

PERIODIC MAINTENANCE 2-15
CYLINDER HEAD, CYLINDER AND
PISTON
CYLINDER HEAD
• Remove the cylinder head. (6-5)
• Remove carbon deposits from combustion chamber surface.
• Inspect for pinholes, cracks and other damage.
CYLINDER
• Remove the cylinder. (6-6)
• Remove carbon deposits from the exhaust port and exhaust
valve chamber.
• Check for scratches and wear on the cylinder sleeve.
PISTON
• Remove the piston. (6-6)
• Remove carbon deposits from the top surface of the piston.
• Check for scratches, cracks, and wear around the piston
bosses.
• Remove minor scuffs with #1 000 – #1 200 sand paper.
• Check piston ring wear. Remove carbon deposits from the
piston ring grooves.
EXHAUST VALVE
• Remove the exhaust valve. (6-13)
• Remove carbon deposits from the exhaust valve 1, exhaust
side valves 2 and exhaust valve cams 3.
• Check for wear and damage.
NOTE:
If tar drops from the exhaust valve breather hose when the
motorcycle is parked, change engine oil brand because some
engine oil can accumulate tar in the exhaust valve chamber.