Mower Loses Power When Hot? Fix It Fast! | V-Twin Running On One Cylinder

At Shade Tree Mower Mechanic, we repair many types of lawn equipment for our customers which include but not limited to: Lawn mowers, chainsaws, hedgers, string trimmers, and many more. Learn how to diagnose and repair all your lawn equipment under the shade tree If your twin-cylinder zero-turn lawn mower starts losing power, coughing, popping, or backfiring after it warms up, it's likely running on only one cylinder. In this video, we diagnose a Briggs & Stratton Vanguard 20 HP V-Twin engine with a classic heat-related misfire and show you exactly how to find out which cylinder isn't firing. We’ll walk you through how to check exhaust temperatures using an infrared thermometer, test for a weak spark under compression, verify engine health with a compression test, and replace a faulty ignition coil that was grounding out due to mouse damage. Video Chapters: 00:00 Symptoms of a V-Twin Engine Losing Power & Popping 00:21 Laser Temp Trick: How to Find a Dead Cylinder Instantly 02:35 Spark Plug Wire Pull Test to Confirm the Misfire 03:07 Using an Inline Spark Tester to Check for Weak Spark 04:37 How to Do a Small Engine Compression Test 06:45 How to Properly Gap a New Spark Plug 10:07 Inspecting the Ignition Coil & Finding Mouse Damage 11:45 How to Replace a Mower Ignition Coil & Set the Air Gap (.010") 13:56 Final Start & Test Run After the Repair Tools & Parts Used: Infrared Laser Thermometer Gun Inline Spark Tester Small Engine Compression Gauge Kit Feeler Gauges / Spark Plug Gapping Tool Replacement Vanguard V-Twin Ignition Coil If this video helped you get your zero-turn back up to full power under the shade tree, hit that like button and subscribe for more real-world small engine repair guides!