12/9/2023 0 Comments Clean exhaust port redmax trimmerThe piston scored because the engine was unable to dissipate heat fast enough.The result is that the piston expands into the exhaust port and the engine seizes. "Piston ring jacking may also have already started to occur."Īn almost totally blocked spark arrestor screen on a two-stroke, air-cooled engine can cause the engine to overheat. "A high amount of carbon and tar that builds up on the spark arresting screen causes a brown color to the piston," Peeler points out. However, if some slight residue remains on the screen after torching it, Peeler says you can use a small non-metallic brush such as a toothbrush to finish cleaning it up-after it cools back down, of course. The scratches and rough surface of the screen then trap small carbon particles, causing accelerated plugging." "This causes the screen to become scratched. "Do not use a wire brush to clean the spark arresting screen," Peeler adds. Make sure there are no fuel, fuel vapors or other flammable materials within 20 feet. Use a small butane torch to burn the carbon off of the screen. In the event that you can-and want to-simply clean the existing screen, Peeler offers some tips on how to properly do so.Ĭlamp the screen in a vise or hold with a pair of pliers. "Every effort should be made to install a new screen before consideration is given to cleaning the existing one." Screen cleaning tips "A blocked spark arrestor screen should be replaced," says Doug Peeler, Husqvarna's North American Technical Training Specialist and active member of the Equipment & Engine Training Council ( EETC). Once you get all the necessary screws out and covers off in order to access the screen, look it over. To inspect the spark arrestor screen-when you sense a problem or otherwise monthly-refer to your string trimmer owner's manual for directions on how to access it. Common symptoms include lack of power, especially under load poor acceleration engine won't come up to full RPM and higher than normal "spit back" through the carburetor. Sometimes the spark arrestor screen can become clogged up itself. That's the little doohickey that helps prevent sparks from flying out of the engine. There's one other thing you can check: the spark arrestor screen inside the muffler. If you're lucky, though, the fuel filter or maybe even the air filter could be really dirty and in need of replacement. There are a few key things to look for when your crew brings a trimmer back to the shop and says, "It just isn't running right." First, the carburetor could be gummed up or shot altogether, which is becoming a bigger and bigger problem thanks to the havoc today's ethanol-blended fuels are wreaking on today's small engines. In the words of one of the most renowned small engine technicians of our time, Sling Blade, " It ain't got no gas in it." If only fixing your downed string trimmer were always that simple.
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