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6.3 Spark Plug Maintenance
Recommended spark plug
WP-2s ........................NHSP LD F6RTCU
WP-2 ..........................NHSP LD F6RTCU
WP-3 ..........................NHSP LD F6RTCU
WP-4 ..........................NHSP LD F7RTC
To keep the engine in good condition, you must keep proper spark plug clearance and no
accumulated carbon.
6.3.1 Dismantle the spark plug cap.
WARNING:
When the engine is running, the exhaust muffler is very hot, be careful and do not
get burns.
6.3.2 Check the spark plug just with the eyes. If there are obvious wear signs around it or the gasket
is cracked, please replace it with a new one. Before reinstalling a spark plug, clean it first with a
wire brush.
6.3.3 Measure spark plug clearance with a feeler gauge and adjust it by bending the side electrode.
Spark plug clearance should be 0.70-0.80 mm.
6.3.4 Check that the spark plug gasket is in good condition, and if not replace with a new one. Drive it
into the engine with a spark plug wrench to protect thread from being damaged.
NOTE
Installing a new spark plug, after it touched and pressed the gasket, twist 1/2 more turns; as to
a used one, twist 1/2-1/4 more turns.
CAUTION:
Be sure to tighten the spark plug securely, otherwise it may become very hot and
possibly damage the engine. Never use a spark plug with improper heat range.
7. STARTING UP IN PLATEAU REGIONS
In plateau or regions with high altitude, standard carburettor produces over-dense combination
of fuel and air, resulting in decreased engine performance and increased fuel consumption. To keep
the engine's high performance, install a carburettor main spray nozzle and readjust the adjusting
screw for idle speed. Using in plateau regions frequently with an altitude of over 1380 m, contact
your dealer for replacing the carburettor and make adjustment in advance. Even though a proper
carburettor spray nozzle is installed in the engine, the power output of the engine will drop about
3.5% with every 1000 ft increase in altitude. If the carburettor replacement and adjustment is not done,
the "plateau-effect" will be more severe.
CAUTION:
Use the water pump in regions with lower altitude than that in which the carburet-
tor spray nozzle is applicable, the engine's performance will be reduced and it
would overheat, and over-thin combination of fuel and air may cause severe dam-
age of the engine.
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