Suzuki GSX-R750 Service Manual page 90

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 & EX): 37.1 mm (1.460 in)
 09900-20102: Vernier calipers
 Valve spring tension (IN. & EX.):
Standard:
Approx. 147 N, 15.0 kgf/33.55 mm (33.1 lbs/1.32 in)
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
• Install the valve spring with the small-pitch portion A facing
cylinder head.
B Large-pitch portion
C UPWARD
D Paint
ENGINE 3-37