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Champion 943M QL77PP Double Platinum Marine Spark Plug

Manufacturer

Champion

<h3>Champion: A Legacy of Engine Performance</h3><p>For decades, <strong>Champion</strong> has been one of the most trusted names in engine ignition and maintenance. Born from a commitment to precision engineering, Champion has earned its reputation by delivering reliable, time-tested replacement parts that keep engines running at their best — whether on the road, on the water, or in the backyard.</p><h3>World-Class Spark Plug Technology</h3><p>Champion's story is inseparable from the spark plug. The brand helped pioneer modern ignition technology, and today its spark plug lineup remains a go-to choice for automotive technicians and DIY mechanics alike. Champion <a href="/120-champion-spark-plug-7212">spark plugs</a> are engineered to deliver consistent ignition performance across a wide range of engine types, from daily-driver commuter cars to high-demand power sport machines. Whether you're tuning up a classic V8 or maintaining a small-displacement four-cylinder, Champion offers a plug designed to match your engine's specific requirements.</p><p>Beyond the plug itself, a reliable ignition system depends on every component working in harmony. Champion's <a href="/120-champion-spark-plugs-spark-plug-boot-kit-23507">spark plug boot kits</a> provide the complete solution — protecting ignition wires and ensuring a secure, interference-free connection between the plug and the ignition system. These kits are especially popular for vehicle owners who want a thorough tune-up rather than a partial fix.</p><h3>Marine and 2-Cycle Engine Solutions</h3><p>Champion's expertise doesn't stop at automotive ignition. The brand also serves boaters and marine enthusiasts with products formulated for the unique demands of water-based engines. Champion <a href="/120-champion-2-cycle-outboard-oil-200042">2-cycle outboard oil</a> is designed to protect outboard motors running in demanding marine conditions, helping to minimize wear, reduce deposits, and extend engine life. It's a natural extension of Champion's core philosophy: give every engine — regardless of application — the quality it deserves.</p><h3>Built for Every Engine, Every Application</h3><p>What sets Champion apart is the breadth of its coverage. From passenger vehicles to boats, lawn and garden equipment to power sport machines, Champion engineers products with real-world performance in mind. The brand's catalog of over 800 products means that regardless of what you drive, ride, or operate, there's a Champion part designed to keep it running at peak efficiency.</p><p>Whether you're doing a routine tune-up or a full ignition system overhaul, Champion's combination of heritage, innovation, and comprehensive coverage makes it a brand worth turning to first.</p>

Part Number

943M
06/02/2036 3:23 PM
Sale Price

$7.32

In Stock (10)

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Usually delivered within 2 days

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Product Details

The Champion 943M (QL77PP) is a premium double platinum marine spark plug designed for superior performance and longevity in demanding marine applications. Featuring platinum tipped center electrode and platinum pad on ground electrode, this spark plug delivers extended service life with minimal wear.

Key Features:

  • Copper core electrode provides increased conductivity and heat control for good overall wear
  • Tapered electrodes create a sharper spark focus and reduce quenching
  • Electrodes use heat-active alloy to reach operating temperatures quickly and maintain stable temperatures under varying engine loads
  • Triple sealed interior and copper core reduce failure due to heat and stress
  • Designed to resist overheating under heavy engine loads
  • Resistor type plug for noise suppression
  • Built to ISO and SAE standards for proven performance

Specifications:

  • Thread Size: M14 (14mm)
  • Thread Reach: 0.500 inch (12mm)
  • Hex Size: 20mm (13/16 inch)
  • Heat Range: 77
  • Gap: 0.022 to 0.028 inch (0.56mm to 0.71mm)
  • Seat Type: Flat gasket seat
  • Single ground electrode design

Installation Torque Specifications:

  • Cast Iron Heads: 26-30 lb-ft
  • Aluminum Heads: 18-22 lb-ft

This marine-grade spark plug is an OE quality replacement recommended for outboard motors, inboard/outboard engines, and other marine applications. The QL77PP is specified as OEM equipment by major marine engine manufacturers including Mercury Marine (cross-reference 33881815). Sold individually in standard retail packaging. UPC: 037551008926.

Products specifications

Manufacturer Part Number

943M

Model Number

QL77PP

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