Adjusting Camshaft-To-Rocker Arm Clearance - Ryobi RY34425, RY34445 Operator's Manual

NOTICE:
Do not overfill. Overfilling the crankcase may cause
excessive smoke, oil loss, and engine damage.
 Reinstall the bottom engine cover. Replace the screws
and tighten securely.
 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 24 - 26.
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.
 Place the feeler gauge under each rocker arm and mea-
sure 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. Take care not to loosen the stud.
MAINTENANCE
• 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.
Ensure all engine cover and all engine parts are completely
and properly reassembled before starting engine. Failure
to correctly reassemble engine could result in serious
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.
 When storing the product vertically, do so with the engine
up to avoid hydraulically locking the engine due to oil
entering the combustion chamber.
IMPORTANT: If the engine/starter rope becomes locked
after storage, place the unit flat on the ground in the
upright position to allow the engine oil to slowly migrate
back into the engine's oil reservoir.
 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.
13 — English
WARNING: