N-Zeta 501/01, Workshop Manual

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To Replace The Crankshaft and Gearbox Output Shaft Seals
When replacing the seals on the crankshaft RH end, it is necessary to first
remove the dynastarter as described in the paragraph dealing with its removal. Next
remove the three screws securing the seal holder and remove the holder and seal
together. Punch the seal out of the holder and press in a new seal. To assemble,
proceed in the reverse manner.
To replace the gearbox output shaft seal, remove the gearbox sprocket and pull off
the spacer, remove the seal using a slide puller; to reassemble, press a new seal
into the crankcase and insert the spacer.
To Remove The Engine From The Frame
Disconnect the leads connected to the terminal block and to the ignition coil,
remove the spark plug lead and further disconnect the speedometer drive, the rear
wheel brake cable from the brake pedal, the gear change rod from the gear change
pedal, the clutch cable in the engine, the fuel pipe, the throttle cable and the choke
cable, the exhaust pipe with the exhaust silencer. In the case of the 501 model, first
unscrew the four front engine plate bolts, the two pivoted rear fork bolts, remove the
luggage compartment and slacken off the two rear suspension blocks. Now remove
the power unit.
In the case of the 502 model, proceed as follows: Unscrew the four front
engine plate bolts, the two fork pivot bolts and slacken the two rear suspension unit
bolts. When being removed, the engine has to be supported. To replace the power
unit, proceed in the reverse manner. How to disconnect the pivoted rear fork is
described in the chapter dealing with the cycle part.