How to Troubleshoot a Makita Chainsaw

Troubleshoot a situation in which the motor is on but the chain isn't working. Do this by first verifying the chain brake is in the off position. The chain brake is a valuable safety mechanism that stops the chain from spinning.

Check for lack of oil or no oil on the chain. First, verify that the oil tank is not empty and if it is, fill it. Clean a dirty oil guide groove. Adjust the oil pump screw. Makita notes that an improperly adjusted oil-pump screw keeps the chain from receiving oil.

Investigate a sputtering or idling engine. First, check for a dirty or clogged air filter. Verify the correct adjustment on the fuel carburetor. Check for clogging or obstructions in the muffler. Check for clogs on the spark arrestor screen. Also check for exhaust channel cylinder obstructions.

Troubleshoot the fuel supply with an engine that starts but dies immediately. Verify that the fuel tank is full and adjust the idle. Check for a dirty fuel filter or carburetor. Inspect for an interrupted fuel line or defective tank-venting device. Check for a defective STOP switch. Also check for a faulty decompression valve.

Verify that the fuel tank is sufficiently full and that an ignition spark is occurring in the event of warm start difficulties. If there's gas, adjust the carburetor until the chainsaw starts properly.

Verify that the ignition is sparking if the chainsaw won't start. Check for a malfunction in the fuel supply system, compression system or a mechanical issue. Check the STOP switch or inspect for a faulty spark plug if there is no ignition spark.

Verify that the fuel tank is full and verify that the choke switch is in the correct position if the chainsaw does not start or starts slowly. Or check for a faulty carburetor, dirty fuel filter or obstructed fuel line. Check the inside of the chainsaw for defective cylinder base packing ring, shaft packing or cylinder/piston rings. Verify that the spark plug is properly sealed. Check for a malfunctioning or broken starter switch.