HAssembly sequence and precautions
(1)Fit the crankshaft oil seal guide onto the crankshaft tip and assemble it with the crank case as shown in Fig.
Note: When the oil seal guide is not used, be careful not to damage the oil seal lip.
(2)Mount the woodruff key (for the mag- neto).
(3)Dimentional tolerance of the crankpin.
I
Oil Seal Guide
External Diameter 24~)
.Crankshaft
Crankcase
I
Fig. 942
WTolerances of new installed parts
I | Thrust directional | tolerance | between | the | cylinder and | piston | skirt |
| 0.02OL | - | 0.059L | |||||
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| Clearance | between | the | piston | ring | joints |
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| 0.2L | - | 0.4L | |
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| i | Top ring |
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| 0.09OL | - | 0.135L | |
| Clearance | between | the | piston | rings |
| ! | Second ring |
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| 0.060L | - | 0.105L | |||
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| I | Oil ring |
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| O.OlOL | - | 0.065L | |
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| 1 | Clearance | between the internal and | s | 0.037 L - | 0.063 L | |||
| Clearance | between | the | connecting | rod | ’ | external | diameters |
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| major ring and crank pin |
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| 1 | Side clearance |
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| 0.1 L - | 0.3L | ||||||
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| Clearance | between | the | connecting | minor | rod | edge and | piston | pin |
| O.OlOL | - | 0.029L | |||
| Clearance | between | the | piston | pin | and | piston | hole |
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| i | 0.009L | - | 0.01 OL | |
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| Table | 94 | 7 |
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Note: The clearance between the piston and cylinder is checked by measuring the clearance between the piston and cylinder skirt.