Cleaning The Engine; Checking The Fuel Filter; Replacing The Spark Plug - Ryobi RCS4246B Operator's Manual

CLEANING THE ENGINE

See Figures 58, 62-64.
Clean the engine fins and flywheel fins with a brush
periodically. Dangerous overheating of the engine may
occur due to impurities on the engine.
WARNING
never run the saw without all the parts, including
the clutch cover and starter housing, securely in
place.
WARNING
parts can fracture and pose a danger of thrown
objects. leave repairs of the flywheel and clutch
to authorised service centre personnel.
1. Remove the screws and engine cover as described
previously.
2. Clean the engine fins.
3. Lift the chain brake over the post.
4. Lay the chainsaw on its side with the bar and chain
on the ground.
5. Remove the chain lubricant and fuel caps.
6. Remove the three screws that hold the starter housing
in place.
7. Lift off the starter cover and set aside.
8. Replace chain lubricant and fuel caps to prevent
contamination during cleaning.
9. Clean the flywheel fins.
10. Replace the starter housing. Reinstall screws and
secure.
11. Replace the chain lubricant and fuel caps.
12. Replace the engine cover. Reinstall screws and
secure.
13. Replace the chain brake on the post.
Note: Check to ensure that the air filter is in the
proper position before reinstalling the engine cover.
Note: If you notice a power loss with the petrol powered
tool, the exhaust port and muffler may be blocked
with carbon deposits. these deposits may need to be
removed to restore performance. We highly recommend
that only qualified service technicians perform this
service.

CHECkING THE FUEL FILTER

See Figure 65.
Check the fuel filter periodically. replace it if
contaminated or damaged.

REPLACING THE SPARk PLUG

See Figure 66.
this engine uses a Champion rCJ4 or rCJ6Y or nGK
Bpmr7a with .025 in. electrode gap. use an exact
replacement and replace every 50 hours or more
frequently, if necessary.
English
1. Remove the spark plug lead by carefully rotating back
and forth whilst gently pulling upwards.
2. Loosen the spark plug by turning it counterclockwise
with a wrench.
3. Remove the spark plug.
4. Hand thread the new spark plug, turning it clockwise.
Tighten securely with wrench.
Note: Be careful not to cross-thread the spark plug.
Cross-threading will seriously damage the engine. A
small drop of lubrication on the thread will ensure the
spark plug is easily removed on the following service.
5. Re-attach the spark plug lead by pressing firmly onto
the top of spark plug.
INSPECTING/CLEANING THE SPARk ARRESTOR
SCREEN
See Figure 67.
the muffler is equipped with a spark arrestor screen.
a faulty spark arrestor screen can create a fire hazard.
through normal use the screen can become dirty and
should be inspected weekly and cleaned as required.
always keep the muffler and spark arrestor on the saw in
good condition.
WARNING
muffler surfaces are very hot during and after
operation of the chainsaw. to avoid serious
personal injury, keep all body parts away from
the muffler.
1. Allow the muffler to cool.
2. Remove the deflector retaining nut.
3. Remove the deflector to access the spark arrestor
screen and gasket.
4. If dirty, clean the spark arrestor screen with a small
wire brush. Replace the screen and gasket if they
are cracked or otherwise deteriorated. Reinstall the
retaining nut.
To obtain a replacement spark arrestor, contact your
Ryobi dealer or service centre.
INSPECTING AND CLEANING THE CHAIN BRAkE
See Figure 68.
n always keep the chain brake mechanism clean by
lightly brushing the linkage free from dirt.
n always test the chain brake performance after
cleaning. refer to Operating Chain Brake for
additional information.
WARNING
even with daily cleaning of the mechanism, the
dependability of a chain brake to perform under
field conditions cannot be certified.
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