Specifi cations
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CLEARANCE
SPECIFICATIONS
3
ECH630-ECH680 ECH730-ECH749 CH26 CH735 CH745
Valves and Valve Lifters
Hydraulic Lifter to Crankcase
Running Clearance
0.011/0.048 mm (0.0004/0.0019 in.) 0.0241/0.0501 mm (0.0009/0.0020 in.)
Intake Valve Stem-to-Valve
Guide Running Clearance
0.040/0.078 mm (0.0016/0.0031 in.) 0.038/0.076 mm (0.0015/0.0030 in.)
Exhaust Valve Stem-to-Valve
Guide Running Clearance
0.052/0.090 mm (0.0020/0.0035 in.) 0.050/0.088 mm (0.0020/0.0035 in.)
Ignition Module Air Gap 0.28/0.33 mm (0.011/0.013 in.)
Speed Sensor Air Gap 1.50 ± 0.25 mm (0.059 ± 0.010 in.)
Intake Valve Guide I.D.
New
Max. Wear Limit
7.040/7.060 mm (0.2772/0.2780 in.)
7.134 mm (0.2809 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
7.134 mm (0.2809 in.)
Exhaust Valve Guide I.D.
New
Max. Wear Limit
7.040/7.060 mm (0.2772/0.2780 in.)
7.159 mm (0.2819 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
7.159 mm (0.2819 in.)
Guide Reamer Size
Standard
0.25 mm O.S.
7.050 mm (0.2776 in.)
7.300 mm (0.2874 in.)
7.048 mm (0.2775 in.)
7.298 mm (0.2873 in.)
Intake Valve Minimum Lift 8.07 mm (0.3177 in.)
Exhaust Valve Minimum Lift 8.07 mm (0.3177 in.)
Nominal Valve Seat Angle 45°