Ryobi SB720R Manual do Operador descarregar pdf (Página 21)

Therecommended clearance for both intake and

exhaust is ,003-.006 in, (.076-.0152 mm). The feeler

gauge should slide between the rocker arm and valve

stem with a slight amount of resistance, without binding.

9. If the clearance is not within specification:

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

wrench or nut driver (Fig. 34).

To increase clearance, turn the adjusting nut

counterclockwise.

To decrease clearance, turn the adjusting nut

clockwise.

b. Recheck both clearances, and adjust as necessary.

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

Torque the screw to 20-30 Jn*lb (2.2-3.4 N,m).

NOTE: A gasket, Part # 182099 can be purchased from

your local authorized dealer.

11. Reinstall the engine cover. Check alignment of the

cover before tightening the screws. Tighten screws.

12. Check the spark plug and reinstall. See Replacing

the Spark Plug.

13. Replace the spark plug wire.

REPLACING THE SPARK PLUG

Use a Champion RDZ19H spark plug (or equivalent). The

correct air gap is 0,025 in, (0,655 ram,). Remove the

plug after every 50 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 a 5/8 in.

socket counterclockwise.

3, Replace cracked, fouled or dirty spark plug. Set the

air gap at 0,020 in. (0.5 mm.) using a feeler gauge

(Fig. 35),

0.025 in.

(0.655 mm.)

Fig, 35

_b AUTION: Do not sand blast, scrape, or clean

electrodes. Grit inthe engine could damage the

cylinder.

4. Install a correctly gaped spark plug in the cylinder

head, Tighten by turning the 5/8 in. socket c_ockwise

until snug,

If using a torque wrench torque to;

110-120 in.,Ib. (12.3-13.5 Nom),

Do not over tighten.

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