Air-fuel compression is crucial to engines powering lawn mowers and outdoor power equipment. The compressions system is made up of valves, piston, cylinders and rings that control how the air and fuel vapors move through the engine.
Valves let air in (the intake valve) and out (the exhaust valve), pistons move back and forth pushing the air-fuel mixture to the ignition system and the piston rings keep it all sealed up tight.
If there isn’t proper valve clearance or there’s a leak, this can cause compression problems that keep an engine from starting. You can perform a compression system with a leak down tester.
If you don’t have one of these, we recommend visiting your Briggs & Stratton repair dealer to perform the test and check that these components are in good shape. Use this simple Q&A format list to troubleshoot small engine problems you may experience with your lawn mower, snow blower or other power equipment.
Stale, untreated gas begins to break down after about a month. Drain the gas from your lawn mower our outdoor power equipment, then replace with fresh gas and fuel stabilizer to extend the life of your fuel.
You can determine if your air-fuel mixture is off by checking the state of your carburetor. Small gas engines serve us in many ways. They power lawn mowers, tillers, cultivators, trimmers, edgers, snowblowers, chain saws, pumps, generators, air compressors, and other useful home tools.
They also power our fun: outboard boats, snowmobiles, motorcycles, all-terrain vehicles, ultralight aircraft, and other toys. To keep them operating efficiently, an owner of these tools and toys should know about small engines: how they work and what to do when they don’t.