Description:
Autolite Xtreme SportTM spark plugs are designed with an iridium-enhanced fine-wire center electrode to provide better ignitability*, faster fuel combustion, and a more focused ignition. Upgrading to iridium will equip your small engine equipment with greater ignitability and 21% less hydrocarbon emissions than standard plugs, resulting in better fuel efficiency and horsepower.
Features and Benefits:
- Engineered with an iridium-enhanced fine-wire center electrode that delivers greater ignitability over standard non-fine-wire spark plug.
- Its high alumina multi-rib ceramic insulator provides thermal conductivity and superior insulation for increased strength.
- The tapered ground electrode provides improved ignitability for more efficient and smoother starts.
Specifications:
Center Electrode Design:
Machined Fine Wire in.
Center Electrode Projection:
Short Projection
Center Electrode Tip Material:
Iridium
Electrical Terminal Type:
Removable Nut
Ground Electrode Tip Design:
Tapered
Ground Electrode Tip Material:
Platinum in.
Manufacturer Heat Range:
15
Terminal Type:
Removable Nut
Briggs & Stratton #:
557039
Champion Spark Plug #:
653
Champion Spark Plug #:
661
DENSO Auto Parts #:
IU27A
DENSO Auto Parts #:
IU27D
Manufacturer Warranty:
84 Months
