Ryobi RY34005, Operator'S Manual

Page: 13 / 50

11 — English
MAINTENANCE

Replace the screw in the top engine cover and tighten
securely.
NOTE:
Used lubricant should be disposed of at an approved
disposal site. See your local retailer for more information.
ADJUSTING CAMSHAFT-TO-ROCKER ARM
CLEARANCE
See Figures 13 - 15.
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 and disconnect the spark plug wire. Allow
the engine to cool completely before proceeding.

Remove the screw from the top engine cover. Remove
engine cover and set aside.

Using a Torx screwdriver, remove the screw from the
rocker arm cover. Remove the cover 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 in figure 14.

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:

While holding a wrench on the flats of the adjusting
nut with one hand, loosen the retaining nut with a
second wrench as shown in figure 15. Take care not
to loosen the stud.

Rotate the adjusting nut until it touches the feeler
gauge. Once the gap setting is correct, hold the
wrench on the flats of the adjusting nut and retighten
the retaining nut securely.

Adjust the second rocker arm, if necessary.
 Replace the rocker arm cover and screw; tighten
securely.

Replace the top engine cover and screw; tighten
securely.
WARNING:
Ensure all engine cover and all engine parts are com-
pletely and properly reassembled before starting engine.
Failure to correctly reassemble engine can result in seri-
ous injury or property damage.
STORING THE PRODUCT

Clean all foreign material from the product. Store idle unit
indoors in a dry, well-ventilated area that is inaccessible
to children. Keep away from corrosive agents such as
garden chemicals and de-icing salts.
 Abide by all ISO and local regulations for the safe storage
and handling of gasoline.
When storing 1 month or longer:
 Drain all fuel from tank into a container approved for
gasoline. Run engine until it stops.
HIGH ALTITUDE ENGINE OPERATION
Please have an authorized service center adjust this engine
if it is to be run above 2000 feet. Failure to do so may result
in poor engine performance and increased emissions. An
engine adjusted for high altitudes can not be run at 2000
feet or lower. In doing so, the engine will overheat and cause
serious engine damage. Please have an authorized service
center restore high altitude modified engines to the original
factory specification before operating below 2000 feet.