{"product_id":"dayuan-petrol-engine-compression-tester-kit-red-case-3-dual-scale-gauge-multi-adapters","title":"DAYUAN Petrol Engine Compression Tester Kit — Red Case, 3\" Dual-Scale Gauge \u0026 Multi Adapters","description":"\u003cp\u003e\u003cstrong\u003eDAYUAN Professional Petrol Engine Compression Tester Kit is a complete petrol engine compression testing set with a 3\" dual-scale gauge, multiple threaded adapters, and quick-check rubber cones in a durable red case.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact kit gives you the fittings and readable gauge needed to measure cylinder compression on a wide range of petrol engines. The included 3-inch gauge displays both psi and bar for fast interpretation, and the stamped adapters cover common spark plug thread sizes so you can test many cars, motorcycles, ATVs, and small engines without buying extra parts.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I use the DAYUAN kit to test cylinder compression?\u003c\/h3\u003e\n\u003cp\u003eTesting with this kit is straightforward: remove the spark plug, attach the proper threaded adapter or rubber cone, crank the engine, and read the peak pressure on the gauge. The kit includes options for both threaded and non-threaded quick checks so you can choose the safest, fastest method for the engine you're working on.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eChoose the correct adapter: M10\/M12\/M14\/M18 or 14mm\/18mm spark plug sizes.\u003c\/li\u003e\n  \u003cli\u003eUse rubber cones for quick, non-threaded checks on irregular ports.\u003c\/li\u003e\n  \u003cli\u003eCrank engine to reach peak pressure and read 0–300 psi \/ 0–20 bar on the 3\" gauge.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and engines will this compression tester work with?\u003c\/h3\u003e\n\u003cp\u003eThe DAYUAN kit is built to cover most petrol engines that use common spark plug thread sizes and small-engine ports. It’s suited to light vehicles and small-displacement motors where the included adapters fit the plug hole or port geometry.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCars and light trucks with 14mm or 18mm spark plug access.\u003c\/li\u003e\n  \u003cli\u003eMotorcycles, scooters, ATVs, and lawn equipment with M10–M18 threads.\u003c\/li\u003e\n  \u003cli\u003eSmall engines and custom applications using rubber cone checks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat does the gauge read and how accurate is the display?\u003c\/h3\u003e\n\u003cp\u003eThe 3-inch gauge has a dual-color scale showing 0–300 psi and 0–20 bar, providing clear readings for both imperial and metric users. The larger face improves legibility under garage lighting so you can capture peak readings reliably while cranking the engine.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e3\" face with dual scale: easy conversion between psi and bar.\u003c\/li\u003e\n  \u003cli\u003eClear color contrast on the dial for quick visual checks under working conditions.\u003c\/li\u003e\n  \u003cli\u003eRobust construction designed to hold pressure during peak measurement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat fittings and accessories are included in the set?\u003c\/h3\u003e\n\u003cp\u003eThe kit is supplied in a sturdy red carrying case and includes threaded adapters with O-rings, two rubber cone ends for fast checks, and dedicated spark plug adapters so you can begin testing immediately. Fittings cover the most frequently encountered plug hole sizes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThreaded fittings: M10, M12, M14, M18 (male with O-ring).\u003c\/li\u003e\n  \u003cli\u003eSpark plug adapters: 14mm and 18mm for direct plug-hole testing.\u003c\/li\u003e\n  \u003cli\u003eTwo rubber cone ends for non-threaded, quick compression checks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Mechanics, DIYers, and small-engine technicians who need a versatile, portable compression tester capable of handling common petrol engines. If you work on cars, motorcycles, ATVs, lawnmowers, or other petrol-powered equipment and want a single kit that covers multiple thread sizes and provides a clear 0–300 psi readout, this DAYUAN tester set is designed to simplify diagnostics and routine maintenance.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can this tester measure both psi and bar?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the 3\" gauge shows dual scales: 0–300 psi and 0–20 bar for quick conversion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the kit fit motorcycle spark plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it includes M10–M18 fittings plus 14mm and 18mm spark plug adapters for many motorcycles.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"DAYUAN","offers":[{"title":"Default Title","offer_id":67592762392761,"sku":"B07BKWPPDR","price":56.4,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/dayuan-red-case-open-front-view.jpg?v=1790567750","url":"https:\/\/redleafauto.ca\/products\/dayuan-petrol-engine-compression-tester-kit-red-case-3-dual-scale-gauge-multi-adapters","provider":"Redleaf Auto","version":"1.0","type":"link"}