Replacing The Spark Plug; Spark Arrestor Maintenance; Accessories/Replacement Parts - Ryobi 510r Operator's Manual

MAINTENANCE AND REPAIR INSTRUCTIONS

REPLACING THE SPARK PLUG

Use only genuine MTD spark plugs. The correct air
gap is 0.025 in. (0.655 mm). Remove the plug after
every 25 hours of operation and check its condition.
1. Stop the engine and allow it to cool. Grasp the plug
wire firmly and pull the cap from the spark plug.
2. Clean dirt from around the spark plug. Remove
the spark plug from the cylinder head by turning
counterclockwise using a 5/8 inch deep socket.
3. Replace cracked, fouled or dirty spark plug. Set the
air gap at 0.025 in. (0.655 mm) using a feeler gauge
(Fig. 33).
0.025 in.
(0.655 mm.)
CAUTION: Do not sand blast, scrape, or clean
electrodes. Grit in the engine could damage the
cylinder.
4. Install a correctly gapped spark plug in the cylinder
head. Tighten by turning the 5/8 inch deep socket
clockwise until snug.
If using a torque wrench torque to;
110-120 in.•lb. (12.3-13.5 N•m)
Do not over tighten.
18
Fig. 33

SPARK ARRESTOR MAINTENANCE

1. Remove the muffler cover. Refer to the Rocker Arm
section.
2. With a flat blade screwdriver or Torx T20 bit, remove
the screw attaching the spark arrestor cover to the
muffler (Fig. 34).
Muffler
Slot
3. Pull the tab on the spark arrestor cover out of the
muffler. Remove the spark arrestor cover.
4. Remove the spark arrestor screen from the spark
arrestor cover.
5. Clean the spark arrestor screen with a wire brush, or
replace.
6. Reinstall the spark arrestor screen, spark arrestor
cover and screw.

ACCESSORIES/REPLACEMENT PARTS

4-Cycle Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181786
Oil Fill Plug / Dipstick . . . . . . . . . . . . . . . . . . . . . 182378
Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180852
Spark Arrestor Screen . . . . . . . . . . . . . . . . . . . . . 180890
Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182271
Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182658
Tine (L) (Left Side Outer or Right Side Inner) . . . .182729
Tine (R) (Right Side Outer or Left Side Inner) . . . .182730
Clevis Pin with Clip . . . . . . . . . . . . . . . . . . . . . . .147473
These replacement parts can be purchased from your
local authorized dealer.
Spark Arrestor Screen
Tab
Screw
Spark Arrestor Cover
Fig. 34