Tune care vs tune sweeper3/18/2023 Remove the blade and sharpen it with a mill bastard file. Disconnect the spark plug and siphon out the fuel tank or remove it, then tip the mower back and give the deck a thorough scraping with a putty knife and a wire brush.Ģ. Here's a midseason checklist to cover your mower's service points:ġ. The air cleaner gets clogged with dirt the blade dulls and if you do your cutting in the early morning, when the grass is wet with dew, the underside of the mower deck gets plastered with a thick layer of grass clippings. Other problems can surface by midseason, especially in machines that have been worked hard. Although expensive compared with fuel from the pump ($5.50 to $7.50 per quart), it's 94 octane and completely free of ethanol. You might also consider prepackaged fuel such as SEF Small Engine Fuel. Take some fuel additive to the gas station and pour it into your fuel container before you fill up. Next, a good rule of thumb is to buy only enough fuel to last two weeks. First, use gasoline that has an octane rating no lower than 87, with an alcohol content no higher than 10 percent (E10). You mention you use fresh fuel, but I'd strongly recommend you do several things to improve your fuel supply and storage. ![]() When it's not doing that, the alcohol stays busy damaging plastic fuel components. The alcohol in the fuel oxidizes to form a tenacious varnish inside the carburetor, which attracts moisture that causes corrosion. My guess is that your mower's malaise is being caused by the alcohol content of today's fuel blends. "Machines used under heavy loads such as high ambient temperatures, dusty conditions or tall grass will require more frequent servicing," says Dennis Blair, technical service department manager for MTD, a manufacturer of lawnmowers and outdoor power equipment. ![]() The tuneup interval for a typical small engine on a mower is about 50 hours or once a season, whichever comes first, but there are exceptions, according to manufacturers. I tune it up every spring, and it always runs on fresh fuel. Every year about the middle of summer, my mower gets harder to start, and it doesn't run as strong as it did earlier in the season.
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