Gear oil needs to be changed every 200 hours.
There is a gear oil drain hole bolt at the rear of
the engine.
(STEP1)
Unscrew this drain hole bolt and let the dirty oil
flow out, catching the oil in a proper container
for later disposal.
(STEP2)
Reinstall the drain hole bolt an tightness.
(STEP3)
Fill with new gear oil through the oil fill hole
located on the engine case beside the gear box.
3.1 ENGINE REMOVAL AND INSTALLATION