TROUBLESHOOTING TABLE

WARNING: Always stop unit and disconnect spark plug before performing all of the recommended remedies below except remedies that require operation of the unit.

TROUBLE

CAUSE

REMEDY

Engine will not

1. ON/STOP switch in STOP

1.

Move ON/STOP switch to ON

start.

 

position.

 

position.

 

2. Engine flooded.

2.

See “Starting a Flooded Engine” in

 

3. Fuel tank empty.

 

Operation Section.

 

3.

Fill tank with correct fuel mixture.

 

4. Spark plug not firing.

4.

Install new spark plug.

 

5. Fuel not reaching

5.

Check for dirty fuel filter; replace.

 

 

carburetor.

 

Check for kinked or split fuel line;

 

6. Carburetor requires

 

repair or replace.

 

6.

Contact an authorised service dealer.

 

 

adjustment.

 

 

Engine will

1. Carburetor requires

1.

See “Carburetor Adjustment” in

not idle

 

adjustment.

 

Service and Adjustments Section.

properly.

2. Crankshaft seals worn.

2.

Contact an authorised service dealer.

 

3. Compression low.

3.

Contact an authorised service dealer.

Engine will not

1.

Air filter dirty.

1. Clean or replace air filter.

accelerate,

2. Spark plug fouled.

2. Clean or replace plug

lacks power,

3.

Carburetor requires

 

and regap.

or dies under

3. Contact an authorised service dealer.

a load.

4.

adjustment.

4. Contact an authorised service dealer.

 

Carbon build-up on

 

 

muffler outlet screen.

 

 

 

5.

Compression low.

5. Contact an authorised service dealer.

Engine

1.

Choke partially on.

1.

Adjust choke.

smokes

2.

Fuel mixture incorrect.

2.

Empty fuel tank and refill with

excessively.

3.

Air filter dirty.

 

correct fuel mixture.

 

3.

Clean or replace air filter.

 

4.

Carburetor requires

4.

Contact an authorised service dealer.

 

 

adjustment.

 

 

Engine runs

1. Fuel mixture incorrect.

1. Empty fuel tank and refill with

hot.

2. Spark plug incorrect.

 

correct fuel mixture.

 

2. Replace with correct spark plug.

 

3. Carburetor requires

3. Contact an authorised service dealer.

 

 

adjustment.

 

 

 

4. Carbon build-up on

4. Contact an authorised service dealer.

 

 

muffler outlet screen.

 

 

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McCulloch MAC 250 B instruction manual Troubleshooting Table Cause Remedy

MAC 250 B specifications

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One of the standout features of the MAC 250 B is its robust engine. The chainsaw is equipped with a 25cc, air-cooled, two-stroke engine that provides a high power-to-weight ratio. This means that despite its relatively lightweight design, the MAC 250 B delivers impressive performance. The engine is engineered for efficient fuel consumption, allowing users to complete their tasks without the need for frequent refueling.

The chainsaw also features a 12-inch guide bar, which strikes a perfect balance between cutting capability and maneuverability. This makes it particularly effective for pruning and small to medium-sized tree maintenance. The chainsaw's chain is designed for easy sharpening and replacement, ensuring that users can keep their tool in optimal condition for the best cutting performance.

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In terms of maintenance, the MAC 250 B is designed for easy access to spark plugs and air filters, which simplifies routine upkeep. This ensures that the chainsaw remains in peak working condition with minimal effort, enhancing its longevity.

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