Suzuki GSR600 Service Manual page 89

• 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
The force of the coil spring keeps the valve seat tight. Weak-
ened spring result in reduced engine power output, and often
account for the chattering noise coming from the valve mecha-
nism.
• 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) : 36.2 mm
(EX): 36.0 mm
 09900-20102: Vernier calipers
 Valve spring tension:
Standard:
(IN) :155 – 179 N (15.8 – 18.3 kgf) 32.55 mm
(EX) :146 – 168 N (14.9 – 17.1 kgf) 32.55 mm
VALVE AND VALVE SPRING REASSEMBLY
• Install the valve spring seat.
• Apply MOLYBDENUM OIL SOLUTION to the oil seal 1, and
press-fit it into position.
 MOLYBDENUM OIL SOLUTION

Do not reuse the removed oil seal.
• 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 oil seal.
 MOLYBDENUM OIL SOLUTION
ENGINE 3-37