Bosch 6743 Spark Plug

Bosch OE Fine Wire Platinum Spark Plug 6743

Bosch 6743 is an OE Fine Wire Platinum spark plug built for steady ignition performance and long service life. It uses a platinum center electrode, a multi-ground design, and a preset gap for direct replacement in a wide range of BMW, Mini, Land Rover, Bentley, and Rolls-Royce applications.

Key Features

• Platinum center electrode for consistent spark delivery and extended wear resistance
• Fine-wire OE-style design for efficient ignition performance
• Multiple ground electrode configuration with 4 ground electrodes
• Preset 1.6 mm gap; do not gap before installation
• 3000 ohm resistor for ignition noise suppression
• Ceramic insulator with flat seat and 14 mm thread diameter
• Heat range 7 with 19 mm reach and 16 mm hex size

Product Line Details

The Bosch OE Fine Wire Platinum line is engineered to match original-equipment spark plug requirements where precise ignition characteristics matter. Part number 6743 uses a platinum firing tip and OE-style construction to support stable combustion in engines specified for fine-wire platinum plugs.

Detailed Description

Bosch 6743 is a 4-cycle spark plug designed for direct-fit service in many BMW 325i, BMW 330i, BMW X5, Mini Cooper, and Rolls-Royce Phantom applications. The platinum center electrode, nickel-cobalt core, and nickel-yttrium ground tip materials are selected to maintain reliable spark performance under normal operating conditions. The preset gap and multi-ground layout help preserve the original ignition setup specified by the vehicle manufacturer.

This part number 6743 is listed for a broad range of import vehicles, including BMW 760Li, BMW 745i, Land Rover Range Rover, and Bentley Arnage. It is a direct replacement choice when the engine calls for an OE Fine Wire Platinum plug with a flat seat and non-projected insulator.

What It Helps Address

• Misfires caused by worn or eroded spark plug electrodes
• Hard starting from weak or inconsistent ignition spark
• Rough idle related to aged secondary ignition components
• Reduced throttle response from degraded plug performance
• Ignition noise concerns in resistor-equipped systems

Installation Notes and Tips

Install Bosch 6743 only in applications listed in the fitment data. The gap is preset, so do not gap this spark plug before installation. Verify the engine calls for a 14 mm thread, 19 mm reach, flat seat, and OE Fine Wire Platinum specification before service. For BMW and Mini applications, confirm the exact model year and engine configuration against the vehicle catalog.

• Fits 2013 Rolls-Royce Phantom, N/A; Do Not Gap, Gap is Preset; To 12/2012; Original Center Electrode Material is Platinum with 4 Ground Electrodes; OE Fine Wire Platinum
• Fits 2004-2012 Rolls-Royce Phantom, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum with 4 Ground Electrodes; OE Fine Wire Platinum
• Fits 2003-2008 BMW 760Li, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2002-2008 Mini Cooper, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2007 Mini Cooper, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum with 4 Ground Electrodes; OE Fine Wire Platinum
• Fits 2001-2006 BMW 325Ci, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2001-2006 BMW 330Ci, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2004-2006 BMW 760i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2004-2006 BMW X3, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum with 4 Ground Electrodes; OE Fine Wire Platinum
• Fits 2004-2006 BMW X3, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2000-2006 BMW X5, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2006 Land Rover Range Rover Sport, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum with 4 Ground Electrodes; OE Fine Wire Platinum
• Fits 2006 Mini Cooper, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; without John Cooper Works Package; OE Fine Wire Platinum
• Fits 2001-2005 BMW 320i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1992-1995 BMW 320i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2001-2005 BMW 325i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2001-2005 BMW 325xi, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2001-2005 BMW 330i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2001-2005 BMW 330xi, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2001-2005 BMW 525i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2001-2005 BMW 530i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2004-2005 BMW 545i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2004-2005 BMW 645Ci, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2002-2005 BMW 745i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2002-2005 BMW 745Li, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2003-2005 BMW Z4, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2003-2005 Land Rover Range Rover, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum with 4 Ground Electrodes; OE Fine Wire Platinum
• Fits 1999-2003 BMW 540i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2000-2003 BMW M5, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2000-2003 BMW Z8, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1999-2002 BMW Z3, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2002 Rolls-Royce Park Ward, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum with 4 Ground Electrodes; OE Fine Wire Platinum
• Fits 1999-2002 Rolls-Royce Silver Seraph, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum with 4 Ground Electrodes; OE Fine Wire Platinum
• Fits 1999-2001 Bentley Arnage, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum with 4 Ground Electrodes; OE Fine Wire Platinum
• Fits 1999-2001 BMW 740i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1999-2001 BMW 740iL, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1999-2001 BMW 750iL, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2000 BMW 323Ci, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1998-2000 BMW 323i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 2000 BMW 328Ci, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1999-2000 BMW 328i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1999-2000 BMW 528i, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1999 BMW 318ti, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1998-1999 BMW 323is, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1999 BMW 328is, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Platinum; OE Fine Wire Platinum
• Fits 1995-1998 BMW 750iL, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
• Fits 1996-1998 BMW Z3, N/A; OE Fine Wire Platinum
• Fits 1995-1997 BMW 850Ci, N/A; Do Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum

Quality Assurance

Bosch is a recognized OE supplier, and the OE Fine Wire Platinum line is built to meet original-equipment style ignition requirements for specified BMW, Mini, Land Rover, Bentley, and Rolls-Royce engines. Part number 6743 is engineered around the listed plug dimensions and electrode design for accurate replacement service.