Predator 63404 - Engine Performance Troubleshooting; Engine Misfires and Stops; Engine Knocks and Backfires

Page 19F*+&<(=:$#='B&T;("<#*$"E&@B('"(&='BB&NOPPPOPRROUVSV8ITEM 63404
7-F6523[6D-503.4-0.56.-.,6 765![
[+*>B(? [*""#>B(&,';"(" [+*>'>B(&7*B;<#*$"
Engine misfires
1. Spark plug cap loose.
2. Incorrect spark plug gap or
damaged spark plug.
3. Defective spark plug cap.
4. Old or low quality gasoline.
5. Incorrect compression.
1. Check cap and wire connections.
2. Re-gap or replace spark plug.
3. Replace spark plug cap.
4. Use only fresh 87+ octane stabilizer-treated
unleaded gasoline.&
H*&$*<&;"(&%'"*B#$(&G#<:&?*+(&<:'$&
Ngk&(<:'$*B&W6NUE&6lgE&6PUE&(<=8Y8
5. Diagnose and repair compression.
(Use 6$%#$(&G#BB&$*<&"<'+<K&
,34[D67703.&D61-56H section.)
Engine stops
suddenly
1. Fuel tank empty or full of impure or low quality
gasoline.
2. Low oil shutdown.
3. Defective fuel tank cap creating vacuum,
preventing proper fuel flow.
4. Faulty magneto.
5. Disconnected or improperly
connected spark plug cap.
1. Fill fuel tank with fresh 87+ octane stabilizer-
treated unleaded gasoline.&
H*&$*<&;"(&%'"*B#$(&G#<:&?*+(&<:'$&
Ngk&(<:'$*B&W6NUE&6lgE&6PUE&(<=8Y8
2. Fill engine oil to proper level.
Check engine oil before EVERY use.
3. Test/replace fuel tank cap.
4. Have qualified technician service magneto.
5. Secure spark plug cap.
Engine stops when
under heavy load
1. Dirty air filter
2. Engine running cold.
1. Clean element.
2. Allow engine to warm up prior
to operating equipment.
Engine knocks
1. Old or low quality gasoline.
2. Engine overloaded.
3. Incorrect spark timing, deposit buildup,
worn engine, or other mechanical problems.
1. Fill fuel tank with fresh 87+ octane stabilizer-
treated unleaded gasoline. &&
H*&$*<&;"(&%'"*B#$(&G#<:&?*+(&<:'$&
Ngk&(<:'$*B&W6NUE&6lgE&6PUE&(<=8Y8
2. Do not exceed equipment’s load rating.
3. Have qualified technician diagnose
and service engine.
Engine backfires
1. Impure or low quality gasoline.
2. Engine too cold.
3. Intake valve stuck or overheated engine.
4. Incorrect timing.
1. Fill fuel tank with fresh 87+ octane stabilizer-
treated unleaded gasoline. &&
H*&$*<&;"(&%'"*B#$(&G#<:&?*+(&<:'$&
Ngk&(<:'$*B&W6NUE&6lgE&6PUE&(<=8Y8
2. Use cold weather fuel and oil additives
to prevent backfiring.
3. Have qualified technician diagnose
and service engine.
4. Check engine timing.
After sudden
impact, engine will
run, but equipment
will not operate
Shaft key or other shear pin
broken by impact to disconnect
engine and limit damage.
Have qualified technician check and replace
broken shaft key or other shear pins.
F*BB*G&'BB&"'I(<A&@+(=';<#*$"&G:($(J(+&)#'%$*"#$%&*+&"(+J#=#$%&<:(&(T;#@?($<&*+&($%#$(8
[16-76&D6-H&5Z6&F3113\0.X&,-D6F!112
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR
MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS
QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE
ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY
STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND
LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY
ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS
THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.