Ryobi RY64400 - Manual (Page 16)

12 - English
MAINTENANCE
Air Filter:

Clean the air filter as previously described.
Cultivator Body:

Clean dirt, grass, and other materials from the entire
unit.
 Wipe the tines with lubricant or spray them with silicone
lubricant to prevent rusting.
 Oil the throttle cable and all visible moving parts. Do not
remove the engine cover.
 Order new parts to replace any that are badly worn or
broken.
 Store in an upright position in a clean, dry place. Store
with the handles in the extended position, or loosen
handle knobs and fold handles down.
Do not allow
throttle cable to become pinched when lowering the
handlebar.
 Properly dispose of any leftover fuel in compliance with
Federal, state. and local laws.
ADJUSTING CAMSHAFT-TO-ROCKER ARM
CLEARANCE
See Figures 21 - 23.
Inspect the camshaft-to-rocker arm clearance after every
25 hours of operation. This should be done in a clean, dust-
free environment.
NOTE: This procedure requires partial disassembly of the
engine. If you are unsure if you are qualified to perform this
operation, take the unit to an authorized service center.

Stop the engine. Allow the engine to cool completely
before proceeding.
 Remove screws from the engine cover. Remove engine
cover and set aside.
 Disconnect the spark plug wire.
 Using a Torx screwdriver, remove the screw from the
rocker arm cover. Remove the cover and gasket and set
aside.
 Position camshaft by pulling the recoil starter grip just
until the deep hole in the camshaft gear is located at the
6 o’clock position as shown.
 Place the feeler gauge under each rocker arm and
measure the gap. The gap should be between .006 in.
(0.15 mm) and .008 in. (0.20 mm) for both rocker arms.
NOTE: Use a standard automotive feeler gauge. The .006
in. (0.15 mm) feeler gauge should slide between the rocker
arm and valve stem with a slight amount of resistance
but without binding. The 0.008 in. (0.20 mm) feeler gage
should not slide between the rocker arms and the cam
lobes — it should be held tight.
 If the valve clearance is not between .006 in. (0.15 mm)
and .008 in. (0.20 mm), the clearance should be adjusted
as follows:
CHANGING ENGINE LUBRICANT
See Figure 20.
For best performance, engine lubricant should be changed
after every 25 hours of operation.
To change the engine lubricant:

Stop the engine and disconnect the spark plug wire. Allow
the engine to cool completely before proceeding.
 Remove the oil fill cap/dipstick.
 Tip the unit on its side and allow lubricant to drain from
the oil fill hole into an approved container.
NOTE: Drain the lubricant while the engine is still warm
but not hot. Warm lubricant will drain quickly and more
completely.
 Return the unit to an upright position and refill with lubri-
cant following the instructions in the Adding/Checking
Engine Lubricant section previously in this manual.
NOTE: Used lubricant should be disposed of at an approved
disposal site. See your local retailer for more information.
CLEANING THE EXHAUST PORT AND MUFFLER
Depending on the type of fuel used, the type and amount of
lubricant used, and/or your operating conditions, the exhaust
port and muffler may become blocked with carbon deposits.
If you notice a power loss with your gas powered tool, you
may need to remove these deposits to restore performance.
We highly recommend that only qualified service technicians
perform this service.
STORING THE CULTIVATOR
The following steps should be taken before storing the cul-
tivator for the season.
Fuel Tank:

Drain the fuel tank completely into a container approved
for gasoline. Even under ideal conditions, stored fuel
containing ethanol or MTBE can start to go stale in 30
days. Stale fuel has a high gum content and can clog the
carburetor and restrict fuel flow. The fuel tank should also
be drained if the cultivator will not be used for more than
two weeks.
 Restart the engine to make sure no fuel is left in the car-
buretor. Run the engine until it stops. This helps prevent
gum deposits from forming inside the carburetor and
possible engine damage.
Spark Plug:

Disconnect spark plug wire and remove the spark plug.
Pour a teaspoon of clean, air-cooled, 4-cycle lubri-
cant through the spark-plug hole into the combustion
chamber.
 Leaving the spark plug out, pull the starter cord two or
three times to coat the inside of the cylinder wall.
 Inspect spark plug and clean or replace, as necessary.
 Reinstall the spark plug, but leave the spark plug wire
disconnected.