2004 SR Johnson 4 Stroke 9.9-15HP Outboards Service Manual, Page 121Get this manual
POWERHEAD REASSEMBLY
Valve Spring Tension
Measure: Compressed force
7,6 kg (16,8Ib)
Vernier calipers
Service limit: 7.6 kg (16.8Ib) at length 28.5 mm (1.12 in)
If lower than service limitReplace
REASSEMBLY
Reassembly is reverse order of disassembly with special attention to the following steps