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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Ryobi 990r manual Troubleshooting, Problem Cause Action

990r specifications

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