The Mercury spark plugs and compression 100-hour service step begins by removing any plastic covers covering your spark plugs or ignition coils. Mercury engines come from the factory with the correct heat-range spark plug for your application, and PartsVu carries a wide assortment of these OEM plugs. Show Shop Recommended Products Mercury Corrosion Inhibitors & Grease NGK Spark Plugs Power Tune Internal Engine Cleaner $8.05 Mercury Storage Seal Fogging Oil $7.00 For most applications, the spark plugs come pre-gapped, but it is advisable to re-check gap to make sure that plugs were not damaged during manufacturing or shipment. While removing the old spark plugs, keep track of which plugs come from which cylinders.
If you were to take your engine to a dealer for your 100-hour service, they would perform a compression test by connecting a compression gauge to the individual cylinders and using the starter motor to turn over the engine. By measuring the engine’s ability to pressurize the cylinder, you can glean information about the condition of the engine internals. To perform this test at home, you will either need a remote starter button, or a friend who can turn the ignition key with the kill lanyard removed. This cranking with the ignition disabled will also prime the fresh oil around the block, reducing friction at startup after the After the compression test is completed – or skipped – you can now begin installing your new spark plugs. For ease of future removal and to reduce the risk of thread damage to the cylinder head, apply a tiny amount of anti-seize compound to the threads of the plug. Use care to avoid contacting the electrode or porcelain center of the plug. Thread the plugs into the cylinder head by hand using caution not to cross thread. Most modern spark plugs use a crush washer that will press down and provide a tight seal as you tighten. Full torque is between 18-21 ft. lbs. Reinstall the plug wires or coils in the same order they came off. Mercury’s service manual recommends using Loctite 271 (Red High Strength) on the bolts that hold the pencil coils over the spark plug, but we find Loctite 242 (Blue Removable Strength) might be a better choice. What’s Spark Plug Gap? A spark plug’s tip temperature and the voltage necessary to fire the plug are directly affected by the gap setting. Most manufacturers set the gap from the factory for that plug’s most popular application. Unfortunately, that plug may have hundreds of applications from automobiles to golf carts. Setting the gap for your particular engine is vital as insufficient spark plug gap can cause pre-ignition, detonation, and even engine damage. Too much gap can result in a higher rate of misfires, loss of power, plug fouling, and poor fuel economy. NGK spark plugs come from the factory pre-gapped for your Mercury outboard. Champion QL78YC Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion QL78YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark... Add to CartAdd to Cart Champion QL77JC4 Spark Plugs$4.99 $3.49 Champion QL77JC4 Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion QL77JC4 Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark... Add to CartAdd to Cart NGK BU8H Spark Plug$5.49 $3.99 NGK BU8H Spark Plug NGK Standard Spark Plugs are proven technology that offer reliable performance. Standard spark plugs are treated with corrosion-resistant plating to ensure ease of installation and removal. The solid copper core offers superior heat... Add to CartAdd to Cart Champion QL77CC Spark Plugs$4.99 $3.99 Champion QL77CC Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion QL77CC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark... Add to CartAdd to Cart Champion L77JC4 Spark Plugs$2.99 $2.49 Champion L77JC4 Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion L77JC4 Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark... Add to CartOut of stock NGK BR8HS Spark Plug$4.49 $3.49 NGK BR8HS Spark Plug NGK Standard Spark Plugs are proven technology that offer reliable performance. 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The Champion QL82C Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark... Add to CartAdd to Cart NGK BR7HS Spark Plug$4.49 $3.49 NGK BR7HS Spark Plug NGK Standard Spark Plugs are proven technology that offer reliable performance. Standard spark plugs are treated with corrosion-resistant plating to ensure ease of installation and removal. The solid copper core offers superior heat... Add to CartAdd to Cart NGK DPR6EA-9 Spark Plug$4.49 $3.49 NGK DPR6EA-9 Spark Plug NGK Standard Spark Plugs are proven technology that offer reliable performance. Standard spark plugs are treated with corrosion-resistant plating to ensure ease of installation and removal. The solid copper core offers superior... Add to CartAdd to Cart NGK BUZ8H Spark Plug$14.99 $10.49 NGK BUZ8H Spark Plug NGK Standard Spark Plugs are proven technology that offer reliable performance. Standard spark plugs are treated with corrosion-resistant plating to ensure ease of installation and removal. The solid copper core offers superior heat... Add to CartAdd to Cart NGK IZFR5J Spark Plug$24.49 $17.49 NGK IZFR5J Spark Plug NGK Laser Iridium spark plugs offer the best combination of performance and longevity. The iridium tipped center electrode provides durability six times harder than platinum. NGK's high-grade pure alumina ceramic and 98% pure... Add to CartAdd to Cart Champion QL76V Spark Plugs$10.49 $6.99 Champion QL76V Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion QL76V Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark... Add to CartOut of stock NGK BUHW Spark Plug$4.99 $3.49 NGK BUHW Spark Plug NGK Standard Spark Plugs are proven technology that offer reliable performance. Standard spark plugs are treated with corrosion-resistant plating to ensure ease of installation and removal. The solid copper core offers superior heat... Out of stock Add to Cart Champion QL82YC Spark Plugs$4.99 $3.49 Champion QL82YC Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion QL82YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark... Add to CartAdd to Cart Champion J4C Spark Plugs$3.49 $2.49 Champion J4C Marine Spark Plug Champion marine spark plugs are quality OEM replacements. The Champion J4C Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs... Add to CartAdd to Cart Champion J6C Spark Plugs$3.49 $2.49 Champion J6C Marine Spark Plug Champion marine spark plugs are quality OEM replacements. 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Mercury Outboard Spark PlugsWe supply a variety of Mercury Outboard Spark plugs from brands like Champion and NGK. Find the right spark plug for your engine with our parts selector at the top of the page. Your engine needs spark plugs to keep it going and that is why all our plugs are coated to resist corrosion and contamination. What brand spark plugs does Mercury use?Mercury Marine/Mercruiser New OEM NGK SPARK PLUG BPR6EFS.
How many spark plugs does a Mercury 4 stroke outboard have?PRO TIP: There are two spark plugs on a Mercury 20HP 4-stroke outboard, and it's important that the cables are attached to the correct spark plug. Label each cable before removing them both, or remove one cable, and replace that spark plug and its cable before working on the other spark plug.
How often should you change spark plugs in a four stroke outboard?Some boaters are adamant about changing their spark plugs every year or 100 hours. PartsVu recommends religiously inspecting your spark plugs annually or every 100 hours, replacing them if they are fouled or damaged, and always replacing them every 300 hours.
What is the difference between a Marine spark plug and a regular spark plug?Per se, other than corrosion resistance, there really isn't any big differences between spark plugs intended for inboard or outboard engines and car engines.
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Spark plugs for mercury 150 4 stroke
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