general information - Martin Nez

ENGINE 3-37• Clean and assemble the head and valve components. Fill theintake and exhaust ports with gasoline to check for leaks.• If any leaks occur, inspect the valve seat and face for burrs orother things that could prevent the valve from sealing.Always use extreme caution when handling gasoline.VALVE SPRINGThe force of the coil spring keeps the valve seat tight. Weakenedspring result in reduced engine power output, and oftenaccount for the chattering noise coming from the valve mechanism.• Check the valve spring for proper strength by measuring itsfree length and also by the force required to compress it.• If the spring length is less than the service limit, or if the forcerequired to compress the spring does not fall within the rangespecified, 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 mmVALVE AND VALVE SPRING REASSEMBLY• Install the valve spring seat.• Apply MOLYBDENUM OIL SOLUTION to the oil seal 1, andpress-fit it into position. MOLYBDENUM OIL SOLUTIONDo not reuse the removed oil seal.• Insert the valve, with its stem coated with MOLYBDENUMOIL SOLUTION all around and along the full stem length withoutany break.When inserting the valve, take care not to damage thelip of the oil seal. MOLYBDENUM OIL SOLUTION