Quicksilver NGK LKAR7C-9 spark plug is an original service spark plug for selected Mercury and Mercury Racing four-stroke outboard motors. The spark plug has Quicksilver part number 33-8M0176616 and is designed as a standard spark plug with nickel electrodes, a copper core, and a built-in resistor.
The LKAR7C-9 has an M12 x 1.25 thread, a thread reach of 26.5 mm, and a hex size of 14 mm. The electrode gap is specified at 0.9 mm, the resistance at 5 kOhm, and the heat range at 7. The gasket seat and solid terminal are part of the spark plug's proven design.
The spark plug fits, among others, selected Mercury 3.4-liter V6, 4.6-liter V8, and 5.7-liter V10 engines in the FourStroke, Pro XS, SeaPro, and Verado series. Compatibility also includes certain Mercury Racing 250R, 300R, 450R, and 500R engines as well as Mercury APEX 200 and 360. The correct serial number range depends on the engine model and must therefore be checked before ordering.
Part number 33-8M0176616 replaces previous numbers 33-8M0135348, 8M0135348, 33-8M0204737, and 8M0204737. Always check the engine serial number, owner's manual, and existing part number, as the same engine power output may be used with different spark plugs.
The electrode gap must be checked and, if necessary, adjusted according to the owner's manual or the engine emission label before installation. The product is supplied as one spark plug.
Key featuresOriginal Quicksilver service spark plug
NGK model: LKAR7C-9
Part number: 33-8M0176616
Thread: M12 x 1.25
Thread reach: 26.5 mm
Electrode gap: 0.9 mm
Resistance: 5 kOhm
Heat range: 7
For selected Mercury and Mercury Racing four-stroke engines
Check engine model, serial number, and electrode gap before installation
