Free length

43 2 mm (1 70 in)

40 mm (1 57 in)

Installed length iValve closcd)

37 1 mm (1 46 in*

34 1 mm (1 34 .n)

installed pressure (Valve closed)

23 7 ± 1 9 kg (52 3 1 4 2 lb*

12 2 ± 1 0kg(269±2 2lb)

Compressed length (Valve open)

28 1 mm (1 11 in)

25 1 mm (0 99 in)

Compressed pressure (Valve open)

70 1 i 4 9 kg (154 6 i 10 8 lb)

366 i 2 6kg (80 7 ± 5 7 lb)

Another symptom of a fatigued spring is insufficient spring pressure when compressed This can be checked using a valve spring compression rate gauge Test each spring individually Place it in the gauge and compress the spring first to the specified compressed length with the valve closed (all spring specifications can be found in previous section. Valve Spring) then to the length with the valve open Note the poundage indicated on the scale at each setting Use this procedure on the outer springs, then the inner springs

All valve springs must be installed with larger pitch upward as shown below

I U^prtch ? Smaû«< p«icf»

Valve leakage check After all work has been performed on the valve and valve seat, and all head parts have been assembled, check for proper valve/valve seat sealing by pouring solvent into each of the intake ports, then the exhaust ports There should be no leakage by the seat If this fluid leaks, disassemble and continue to lap with fine tapping compound Clean all parts thoroughly, reassemble and check again with solvent Repeat this procedure as often as necessary to obtain a satisfactory seal Valve stem seal

This seal slips down over the valve stem to prevent excessive amounts of oil from passing down stem and into the combustion chamber If this seal is cracked, split, or hardened, replace it.

Valve guide

If the valve guide inside diameter is beyond serviceable limits, replace with an oversize valve guide

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