CAUTION: Use the recommended spark plug. Refer to Technical data section of your manual. An incorrect spark plug can cause damage to the product.
If the product is not easy to start or to operate or if the product operates incorrectly at idle speed, examine the spark plug for unwanted materials. To decrease the risk of unwanted material on the spark plug electrodes, do these steps:
make sure that the idle speed is correctly adjusted.
make sure that the fuel mixture is correct.
make sure that the air filter is clean.
Clean the spark plug if it is dirty.
Make sure that the electrode gap is correct. Refer to, Technical data section of your manual.
Replace the spark plug monthly or more frequently if necessary.