Unit : mm(in.) G424 Service Manual Specifications 15 Item Standard value Limit Remarks Piston ring End gap No. 1 ring 0.25 to 0.40 (0.0098 to 0.0157) 0.8 (0.031) No. 2 ring 0.45 to 0.60 (0.0177 to 0.0236) 0.8 (0.031) Oil ring 0.20 to 0.60 (0.0079 to 0.0236) 1.0 (0.039) Ring-to-ring groove clearance No. 1 0.03 to 0.07 (0.0012 to 0.0028) No.
2 0.03 to 0.07 (0.0012 to 0.0028) Piston pin Outside diameter 22.002 to 22.005 (0.86622 to 0.86634) Press-in load (at room temperature), N (kg) [lbf] 7350 to 17160 (750 to 1750) [1650 to 3860] Connecting rod Big end center-to small end center length 149.9 to 150.0 (5.902 to 5.906) Bend 0.05 (0.0020) Twist 0.10 (0.0039) Big end thrust clearance 0.10 to 0.25 (0.0039 to 0.0098) Crankshaft End play 0.05 to 0.18 (0.0020 to 0.0071) Journal outside diameter 56.982 to 57.000 (2.24338 to 2.24409) Pin Outside diameter 44.985 to 45.000 (1.77106 to 1.77165) Out-of-roundness and taper of journal and pin 0.005 (0.00020) Concentricity journal and pin 0.03 (0.0012) Oil clearance of journal 0.02 to 0.04 (0.0008 to 0.0016) Oil clearance of pin 0.02 to 0.05 (0.0008 to 0.0020) Cylinder block Cylinder inner diameter 86.50 to 86.53 (3.4055 to 3.4067) Flatness of gasket surface 0.05 (0.0020) Grinding limit 0.2 (0.008) Total resurfacing depth of both cylinder head and cylinder block Overall height 289.9 to 290.1 (11.413 to 11.421) Oil pump Side clearance Drive gear 0.08 to 0.14 (0.031 to 0.0055) Drive gear 0.06 to 0.12 (0.0024 to 0.0047) Drive belt Deflection New belt 7.0 to 10.0 (0.28 to 0.39) Used belt 10 (0.39) Carburetor Throttle bore diameter 32 (1.26) Outer venturi diameter 24 (0.94) Inner venturi diameter 9 to 12 (0.35 to 0.47) Main jet (Symbol Size) 132.5 Main air jet diameter 0.9 (0.035) Pilot jet diameter 0.55 (0.0217) Pilot air jet diameter 1.6 (0.063) Primary throtle valve to throtle bore clearance 1.1(0.043)