2003 HARLEY-DAVIDSON Spark Plugs

Spark Plug, Standard Series, Gasket Seat, 12mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-3932

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

Spark Plug, Standard Series, Gasket Seat, 12mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-4339

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Today

Spark Plug, NGK DCPR7EIX SOLID Iridium IX Series Spark Plug, 19mm Reach, 12mm Thread, Heat Range 7, Flat Seat, 5/8 Hex, .031 in. Gap, Each

Part Number: NGK-97637

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

Spark Plug, Copper Core, Gasket Seat, 12mm Thread, .750 in. Reach, Partial Projected, Resistor, Each

Part Number: ATL-4164

Not Yet Reviewed

Estimated Ship Date: Today

Spark Plug, Iridium IX, Iridium, 12mm Thread, 0.750 in. Reach, Flat Seat, 5/8 in. Wrench Size, Each

Part Number: NGK-97181

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Spark Plug, XP Xtreme Performance, Iridium, 12mm Thread, 0.750 in. Reach, Gasket Seat, 11/16 in. Wrench Size, Each

Part Number: ATL-XS4164

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Spark Plug, Copper Plus, 12mm Thread, .750 in. Reach, Resistor, Each

Part Number: CPN-810

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• $25 Summit Bucks

Spark Plug, E3, Gasket Seat, 12mm Thread, 0.750 in. Reach, Projected Tip, Resistor, Each

Part Number: ETP-E3-36

4.78 out of 5 stars ( 9 )

Estimated Ship Date: Today

Spark Plugs, Platinum Tip, 12mm Thread Size, Harley-Davidson®, Pair

Part Number: ALM-Y2418P

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Apr 28, 2026 if ordered today

• Drop Ship
• Special Order

Spark Plug, XS Xtreme Sport, Iridium, 12mm Thread, 0.750 in. Reach, Gasket Seat, 11/16 in. Wrench Size, Each

Part Number: ATL-XS4162

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Spark Plug, Iridium, Iridium, 12mm Thread, 0.750 in. Reach, Flat Seat, 5/8 in. Wrench Size, Each

Part Number: CPN-9701

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

• $25 Summit Bucks

Spark Plug, RA8HC, Copper Core, 12mm Thread, .750in. Reach, Resistor, Each

Part Number: CPN-810C

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• $25 Summit Bucks

Spark Plug, 12mm Thread Size, .750 in. Reach, 6 Heat Range, Powersports, Each

Part Number: CPN-8809-1

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Estimated Ship Date: Today

• $25 Summit Bucks