Ryobi 990r - Manual (Page 26)

26
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.