While you can build your own, it may not be accepted if checked by a LEO unless it has the USFS approval on the outside. In order to empty out the accumulated carbon particles with a removable end cleanout, the entire add-on must be removed by loosening the retaining band or screws, to shake out the carbon particles. A removable end cleanout is usually secured to the muffler by a retaining band and/or several screws. Such as a cleanout plug, snap ring, removable end cap or a removable end cleanout. Add-on spark arresters must have a method for removal of accumulated carbon particles.
They are typically used on Off-Highway-Vehicles. " Add-On" Spark Arresters are added onto an existing muffler exhaust system. These are originally qualified for all the positions described in the "Application Positions" section. Screen material shall be heat and corrosion resistant, and shall provide at least 100 hours of service life. 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. All exhaust products must pass through the screen, which has openings of 0.023-inch or less. They are intended for use on small engine applications. Screen-Type Spark Arresters as defined by USDA Forest Service Standard 5100-lb fall into a special category. Spark arresting effectiveness shall be at least 80 percent for all flow rates on the cold test which correlates to 90 percent on a hot engine. Either of these documents establish the minimum performance and maintenance requirements of single-position application general purpose spark arrester. Use a small brush to scrub away any remaining debris on the screen. This will help loosen any build-up on the screen. Soak the screen in a solution of water and vinegar for about 30 minutes. This can usually be done by unscrewing a few screws. General Purpose Spark Arresters are tested against USDA Forest Service Standard 5100-lb or the latest revision of Society of Automotive Engineers (SAE) Recommended Practice SAE J350. Remove the spark arrestor screen from the muffler.
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