Ryobi 990r manual Troubleshooting, Problem, Cause, Action

TROUBLESHOOTING

PROBLEM	CAUSE	ACTION
Engine Is Difficult to	Ignition switch is “STOP (O)"	Turn switch to “RUN (I)”
Start or Will Not Start
	Primer bulb wasn’t pushed enough	Press primer bulb fully and slowly 5-7 times
	Engine is not choked	Use starting procedure, USING
		"FULL" CHOKE" (Page 9)
	Empty fuel tank	Fill fuel tank
	Engine flooded	Use starting procedure, USING
		"PARTIAL" CHOKE (Page 9)
	Valve clearance is out of	Use adjust valve to rocker arm
	adjustment	clearance procedure (Pages 18 and 19)
	Plugged spark arrester screen	Clean or replace spark arrester screen (Page 19)
	Spark plug fouled	Clean spark plug and regap or replace
Engine Will Not Idle	Air filter is plugged	Clean and re-oil air filter or replace (Page 15)
	Carburetor misadjusted	Adjust carburetor (Pages 16-17)
Engine Will Not Accelerate	Carburetor misadjusted	Adjust carburetor (Pages 16-17)
Engine Lacks Power or Stalls	Dirty air filter	Clean and re-oil air filter or replace (Page 15)
When Cutting
	Valve clearance is out of	Use adjust valve to rocker arm
	adjustment	clearance procedure (Pages 18-19)
	Dirty spark arrestor screen	Clean or replace screen
	Carburetor misadjusted	Adjust carburetor (Pages 16-17)
	Not enough fuel in fuel tank	Fill fuel tank
Cutting Head Will Not Advance	Cutting head out of line	Refill with new cutting line (Pages 13-14)
Line
	Inner reel bound up	Replace inner reel (Pages 13-14)
	Cutting head dirty	Clean inner reel and outer spool (Pages 13-14)
	Indexing teeth worn or burred	Replace inner reel and outer spool
		(Pages 13-14)
	Line welded	Disassemble cutting head, remove the welded
		section and rewind the line
	Line twisted when refilled	Disassemble cutting head and rewind reel
	Not enough line is exposed	Push the Bump Knob and pull out the line until
		a minimum of 102 mm (4 in) is outside of the
		cutting head
Starter Rope Is Difficult to Pull	Oil accumulated in combustion	Remove the spark plug
or Engine Locks	chamber
	Unit operated with low or no oil	Drain the oil from the spark plug hole
		Pull the starter rope several times to remove
		any excess oil from the cylinder
		Clean the spark plug and wipe off excess oil
		with a dry cloth
		Reinstall the spark plug
		Check oil before starting

If further assistance is required, contact your local authorized service dealer or call 1-800-345-8746.

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