N-Zeta 501/01, Workshop Manual

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E n g i n e
The following jobs can be carried out without removing the engine from the
bodywork:
Removal of the cylinder barrel and head for replacement, re-boring or
decoking, cleaning or replacement of the piston, replacement of the connecting rod
small end bush, ignition advance setting, removal of the ignition and dynamo,
replacement of the gearbox chain sprocket, the primary drive chain and final drive
chain, replacement and adjusting of the clutch and gear change mechanism, removal
of the cooling fan.
Cylinder Head and Cylinder Barrel Removal.
First remove the luggage compartment
– this job is described in the Bodywork
chapter. Dismantle the cooling fan - this job is described in the next chapter. For the
501 model, unscrew the two exhaust pipe nuts, for the 502 model, unscrew the bolt
fastening the exhaust pipe and remove the pipes from the cylinder barrel.
With the 14mm box spanner, unscrew the four nuts fastening the cylinder
head and remove the head through the top opening in the bodywork. Fig. 4
Fig. 4
Fig. 5