Zenoah GZ50N - Manual (Page 6)

GB-6
GZ50N
• REPLACEMENT PLUG IS A NGK CMR7H.
IMPORTANT
• Note that using any spark plug other than those des-
ignated may result in the engine failing to operate prop-
erly or in the engine becoming overheated and dam-
aged.
• To install the spark plug, first turn the plug until it is
finger tight, then tighten it a quarter turn more with a
socket wrench.
TIGHTENING TORQUE:
9.8 ~ 11.8 N.m.
(87 ~ 104 in-lbs)
WARNING
• Make sure that the engine has stopped and is cool
before performing any service to the machine.
Contact with moving cutting head or hot muffler
may result in a personal injury.
AIR FILTER
• The air filter, if clogged, will reduce the engine
performance.
• Filter element : Check and clean the filter element in
warm, soapy water as required. Dry completely before
installing.
• Paper element : Check and clean the paper element
by air blow as required.
• If the element is broken or shrunk, replace with a new
one.
FUEL FILTER
• When the engine runs short of fuel supply, check the
fuel cap and the fuel filter for blockage.
(1) Fuel filter
(1) Filter element
(2) Paper element
(2) (1)
(1)
6. Maintenance
SPARK PLUG
• Starting failure and misfiring are often caused by a
fouled spark plug. Clean the spark plug and check
that the plug gap is in the correct range. For a re-
placement plug, use the correct type specified by
ZENOAH.
Every Every Every
25 50 100
System/components Procedur
Before hours hours hours
Note
use after after after
fuel leaks, fuel spillage wipe out
fuel tank, air filter, fuel filter inspect/clean replace, if necessary
idle adjusting screw see adjusting replace carburetor
idling speed if necessary
spark plug
clean and readjust GAP: .025 in (0.6 ~ 0.7 mm)
plug gap replace, if necessary
cylinder fins, intake air cooling vent clean
muffler, spark arrester, cylinder
clean
exhaust port
0.6~0.7mm
(0.024~0.027in.)