MTD 450 Series User Manual

14
For repairs beyond
the minor adjust-
ments listed here,
contact an authorized
service dealer.
6
Trouble
Shooting
CauseProblem
Remedy
Engine fails to start
1. Throttle lever not in correct starting
position (if equipped).
2. Spark plug wire disconnected.
3. Choke not in CHOKE position (if
equipped).
4. Fuel tank empty or stale fuel.
5. Engine not primed (if equipped).
6. Faulty spark plug.
7. Blocked fuel line.
8. Engine flooding.
1. Move throttle lever to FAST or START
position.
2. Connect wire to spark plug.
3. Move choke lever to CHOKE position.
4. Fill tank with clean, fresh gasoline.
5. Prime engine as instructed in engine
manual.
6. Clean, adjust gap, or replace.
7. Clean fuel line.
8. Wait a few minutes to restart, but do not
prime.
Engine runs erratic 1. Connect and tighten spark plug wire.
2. Move choke lever to OFF position.
3. Clean fuel line; fill tank with clean, fresh
gasoline.
4. Clear vent.
5. Drain fuel tank and carburetor. Refill with
fresh fuel.
6. Refer to engine manual.
7. See authorized service dealer.
1. Spark plug wire loose.
2. Unit running on CHOKE (if
equipped).
3. Blocked fuel line or stale fuel.
4. Gas cap vent plugged.
5. Water or dirt in fuel system.
6. Dirty air cleaner.
7. Carburetor out of adjustment.
Engine overheats
1. Fill crankcase with proper oil.
2. Refer to the engine manual packed with
your unit.
3. See authorized service dealer.
1. Engine oil level low.
2. Dirty air filter.
3. Carburetor not adjusted properly.
Occasional skip
(hesitates) at high speed
1. Adjust gap to .030”. Refer to engine
manual.
2. See authorized service dealer.
1. Spark plug gap too close.
2. Carburetor idle mixture adjustment
improperly set.
Excessive vibration
1. See authorized service dealer.
1. Loose parts or damaged impeller.
1. Low engine RPM.
2. Chipper blade dull.
Rate of discharge
slows considerably
or composition of
discharged material
changes.
1. Always run engine at full throttle.
2. Replace chipped blade or see your
authorized dealer.
Unit does not discharge
1. Stop engine immediately and disconnect
spark plug wire. Clean flail screen and
inside of discharge opening.
2. Stop engine and disconnect spark plug
wire. Remove lodged object.
3. Always run engine at full throttle
1. Chute deflector clogged.
2. Foreign object lodged in impeller.
3. Low engine RPM.

MTD 450 Series Specifications

General

Brand	MTD
Model	450 Series
Category	Tiller
Language	English