Chainsaw Engine Dies When Hot

A common issue is a chainsaw engine cutting out when hot. Several factors can cause this, and this guide outlines the main reasons.

Spark Arrestor is Clogged

The spark arrestor screen can become clogged with carbon deposits from prolonged exposure to sparks. This metallic wire mesh prevents sparks from exiting the muffler. Check it for blockages. If it’s clean, that’s fine. If it’s clogged, clean it with a wire brush or replace it.

Fuel Filter is Clogged

The fuel filter ensures the gasoline supplied to the carburettor is clean. Poor fuel quality can lead to deposits forming on the filter. A clogged filter restricts gasoline flow, causing the engine to stall. Replace the filter if it’s clogged. If it appears clean, the issue may lie elsewhere.

Air Filter is Dirty

The air filter cleans the air before it reaches the carburettor. A dirty filter disrupts the air-fuel mix, leading to starting issues. Inspect the filter for dirt. If it’s not too dirty, clean it with soap and water. If it remains dirty after cleaning, replace it.

Carburettor is Restricted

A restricted carburettor is a common cause of engine stalling. It formulates the air-fuel mixture for combustion. If fuel sits in the tank too long, it can degrade, forming white deposits in the fuel lines. These deposits can clog the carburettor jets, affecting fuel flow to the engine.