CAUTION: Use the recommended spark plug. Refer to Technical data section of your manual. An incorrect spark plug can cause damage to the product.
Tip:
To decrease the risk of unwanted material on the spark plug electrodes in the future, take always these preventive 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.
How to: Check the spark plug