2007-2009 Suzuki LTZ90 factory service manual, Page 70Get this manual
VALVE SPRING The force of the coil spring keeps the valve seat tightWeakened spring results in reduced engine power output, and often accounts for the chattering noise coming from the valve mechanismCheck the valve spring for proper strength by measuring its free length and also by the force required to compress itIf 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 springValve spring free length: Service limit: (IN) 32.8 mm (1.29 in) (EX) 32.8 mm (1.29 in) 09900-20102: Vernier calipers Valve spring tension: Standard: (INEX) 110 126 N, 11.0 12.6 kgf 26.8 mm (79.5 91.1 lbs 1.05 in) REASSEMBLY Install the valve spring seat Apply MOLYBDENUM OIL SOLUTION to the oil seal 1, and press-fit it into positionMOLYBDENUM OIL SOLUTION