McCulloch 250 B - Manual (Page 15)

15
TROUBLE CAUSE REMEDY
Engine will not
start.
1. ON/STOP switch in STOP
position.
2. Engine flooded.
3. Fuel tank empty.
4. Spark plug not firing.
5. Fuel not reaching
carburetor.
6. Carburetor requires
adjustment.
1. Move ON/STOP switch to ON
position.
2. See “Starting a Flooded Engine” in
Operation Section.
3. Fill tank with correct fuel mixture.
4. Install new spark plug.
5. Check for dirty fuel filter; replace.
Check for kinked or split fuel line;
repair or replace.
6. Contact an authorised service dealer.
Engine will
not idle
properly.
1. Carburetor requires
adjustment.
2. Crankshaft seals worn.
3. Compression low.
1. See “Carburetor Adjustment” in
Service and Adjustments Section.
2. Contact an authorised service dealer.
3. Contact an authorised service dealer.
1. Air filter dirty.
2. Spark plug fouled.
3. Carburetor requires
adjustment.
4. Carbon build-up on
muffler outlet screen.
5. Compression low.
Engine will not
accelerate,
lacks power,
or dies under
a load.
1. Clean or replace air filter.
2. Clean or replace plug
and regap.
3. Contact an authorised service dealer.
4. Contact an authorised service dealer.
5. Contact an authorised service dealer.
Engine
smokes
excessively.
1. Choke partially on.
2. Fuel mixture incorrect.
3. Air filter dirty.
4. Carburetor requires
adjustment.
1. Adjust choke.
2. Empty fuel tank and refill with
correct fuel mixture.
3. Clean or replace air filter.
4. Contact an authorised service dealer.
Engine runs
hot.
1. Fuel mixture incorrect.
2. Spark plug incorrect.
3. Carburetor requires
adjustment.
4. Carbon build-up on
muffler outlet screen.
1. Empty fuel tank and refill with
correct fuel mixture.
2. Replace with correct spark plug.
3. Contact an authorised service dealer.
4. Contact an authorised service dealer.
WARNING:
Always stop unit and disconnect spark plug before performing all of the
recommended remedies below except remedies that require operation of the unit.
TROUBLESHOOTING TABLE