Suzuki RM-Z250 Owner's Service Manual page 112

• Clean and assemble the head and valve components. Fill the
intake and exhaust ports with gasoline to check for leaks.
• If any leaks occur, inspect the valve seat and face for burrs or
other things that could prevent the valve from sealing.
Always use extreme caution when handling gasoline.
VALVE SPRING
• Check the valve spring for proper strength by measuring its
free length and also by the force required to compress it.
• If the spring length is less than the service limit, or if the force
required to compress the spring does not fall within the range
specified, replace the spring.
" Valve spring free length:
Service limit: (IN.): 37.1 mm (1.46 in)
: (EX.): 37.5 mm (1.48 in)
# 09900-20101: Vernier calipers (150 mm)
" Valve spring tension:
Standard: (IN. & EX.): 147 N (15 kgf)/33.55 mm
VALVE REASSEMBLY
• Install the valve spring seat.
• Apply MOLYBDENUM OIL SOLUTION to the stem seal 1,
and press-fit it into position.
Do not reuse the removed stem seal.
% MOLYBDENUM OIL SOLUTION
• Insert the valve, with its stem coated with MOLYBDENUM
OIL SOLUTION all around and along the full stem length with-
out any break.
When inserting the valve, take care not to damage the
lip of the stem seal.
% MOLYBDENUM OIL SOLUTION
& WARNING
(33.1 lbs/1.321 in)
CAUTION
CAUTION
CYLINDER HEAD, CYLINDER AND PISTON 6-17