5-8
Periodic maintenance
4.
Install the diaphragm so that its notch is aligned
with the notch on the transmission (HST) oil reser-
voir, and then tighten the oil reservoir cap securely.
Changing the worm case oil
If necessary, have a Yamaha dealer change the worm
case oil.
TIP
For the first worm case oil change, change the worm
case oil after 20 operating hours (that is, when you
have refueled four times). After that, change the worm
case oil each time the winter season begins.
Checking and cleaning the spark plug
The spark plug is an important component that can be
checked relatively easily. As the effectiveness of the
spark plug gradually falls over time and according to
how it is used, periodic inspections involving removal of
the spark plug are required.
1.
Stop the engine and remove the engine switch key.
2.
Remove the bolts.
3
2
1
1. Notch
2. Diaphragm
3. Oil reservoir cap
• The engine and muffler will still be very hot
immediately after the engine is stopped. Exercise
care not to burn yourself.
• When removing or installing the spark plug, exer-
cise care not to damage its insulator. Poor elec-
trical insulation could cause high voltage leaks
resulting in a fire and serious burns.
WARNING
1
2
1. Left side cover
2. Bolt
7XE-28199-U6-E0.book 8 ページ ２０２０年５月１日 金曜日 午後３時４３分