1999-2004 Suzuki King Quad LT-300 300F ATV Factory Service Manual, Page 72Get this manual
VALVE SPRING The force of the coil spring keeps the valve seat tightA weakened spring results in reduced engine power output and accounts for the chattering noise coming from the valve mechanismCheck the valve springs for proper strength by measuring their free length and also by the force required to compress themIf the spring length is less than the service limit or if the force required to compress the spring does not fall within the specified range, replace both the inner and outer springs as setService Limit Valve spring free length (INEX) INNER: 35.1 mm (1.38 in) OUTER: 39.9 mm (1.57 in) Standard Valve spring tension (INEX) INNER: 7.1-9.2 kgl32.5 mm (15.7-20.3Ibs1.28 in) OUTER: 17.3-21.3 kgl36.0 mm (38.1-47.0 Ibsl1.42 in) CYLINDER HEAD REASSEMBLY Apply molybdenum oil solution to each oil seal and press-fit them into position7.19.2 kg