56mm Replacement Spark Arrestor Screen Insert

• Color: Silver
• Finish: Natural
• Flange Thickness: 1.75mm
• For Core Size: 38mm to 50mm
• Inner Diameter: 36mm
• Length: 50mm
• Material: Stainless Steel
• Mesh Opening Size: < .023 In.
• Mounting Style: Bolt-On
• Outer Diameter: 56mm
• Type: Baffle

Replacement spark arrestor screen in stainless steel. Compatible with Slasher exhausts; most Big Gun, Dr. D, Trinity, Dasa, Pro Moto Billet, & Pro Circuit. Will fit many old style FMF exhausts, and many others with a "clamp" style install. Meets USDA/USFS requirements for screen type arrestors when used in appropriate muffler: Screen-Type Spark Arresters as defined by U.S. Forest Service Standard 5100-1c fall into a special category. They are intended for use on small engine applications. All exhaust products must pass through the screen, which has openings of 0.023-inch or less. The effective exhaust area of the screen (total area of all screen openings) shall not be less than 200 percent of the engine exhaust port area at its smallest cross-section. Screen material shall be heat and corrosion resistant, and shall provide at least 100 hours of service life. These are originally qualified for all the positions described in the "Application Positions" section.

Why does the USFS require a spark arrestor?

Fire Hazard from Exhaust Particles: All internal combustion engines produce exhaust particles which are predominately carbon with contaminates. These particles originate from deposits formed on the internal surfaces of the engine or exhaust system and, depending on their exact origin, may be expelled at temperatures in excess of 3,000 °F. Depending on the nature of the contaminates, these particles are capable of glowing or sometimes flaming combustion. When expelled through the exhaust system into the atmosphere, the combustion process may continue or even be accelerated during flight. Such particles, if larger than 0.023-inch in diameter and at temperatures of 1,200 °F, are capable of igniting cellulose materials upon contact.

Reducing Fire Hazard: A Spark Arrester is a device which traps or pulverizes exhaust carbon particles to a size below 0.023-inch in diameter, as they are expelled from an exhaust system. Trap-type spark arresters must have a method for removal of accumulated carbon particles. Most spark arresters generally perform in the high 90 percent spark arresting effectiveness range.