Ryobi 510r User Manual download pdf (Page 17)

MAINTENANCE AND REPAIR INSTRUCTIONS

4. Disconnect the spark plug wire.

5. Clean dirt from around the spark plug. Remove the

spark plug from the cylinder head by turning a 5/8-

inch socket counterclockwise.

6. Remove the engine cover.

NOTE: To ease engine cover removal, pull the starter

rope out a little to give some slack.

7. Clean dirt from around the rocker arm cover.

Remove the screw holding the rocker arm cover with

a large flat blade screwdriver or Torx T25 bit

(Fig. 30). Remove the rocker arm cover and gasket.

Rocker Arm Cover

Screw

Fig. 29

Fig. 30

Spark Plug Hole

8. Pull the starter rope slowly to bring the piston to the

top of its travel, (known as top dead center). Check

that:

• The piston is at the top of its travel while looking in

the spark plug hole (Fig. 30).

• Both rocker arms move freely, and both valves are

closed.

If not, repeat this step.

9. Slide the feeler gauge between the rocker arm and

the valve return spring. Measure the clearance

between the valve stem and rocker arm (Fig. 31).

Do both intake and exhaust valves.

The recommended clearance for both intake and

exhaust is .003 – .006 in. (.076 – 0.152 mm). Use a

standard automotive .005 in. (0.127 mm) feeler gauge.

The feeler gauge should slide between the rocker arm

and valve stem with a slight amount of resistance,

without binding (Fig. 32).

Adjusting Nuts

Feeler Gauge

Rocker Arms

Gasket

Fig. 31

Fig. 32

Feeler Gauge

Adjusting Nut

Rocker Arm

.003–.006 in.

(.076–0.152 mm)

Valve Stem

10. If the clearance is not within specification:

a. Turn the adjusting nut using a 5/16 inch (8 mm)

wrench or nut driver (Fig. 32).

• To increase clearance, turn the adjusting nut

counterclockwise.

• To decrease clearance, turn the adjusting nut

clockwise.

b. Recheck both clearances, and adjust as necessary.

11. Reinstall the rocker arm cover using a new gasket.

Torque the screw to 20–30 in•lb (2.2–3.4 N•m).

NOTE: A rocker arm cover gasket, Part # 182099 can be

purchased from your local authorized dealer.

12. Reinstall the engine cover. Check alignment of the

cover before tightening the screws. Tighten screws.

13. Replace the muffler cover. Slip the long tabs on the

muffler cover into the engine cover. Slide the

notches on the side of the muffler cover over the

tabs on the engine cover and snap into place

(Fig. 27).

14. Check the spark plug and reinstall. Refer to

Replacing the Spark Plug.

15. Replace the spark plug wire.

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Ryobi 510r User Manual Page 17

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