NGK Spark Plug - #3521/04 — Harley-Davidson Road King, Road King Special, Electra Glide Ultra Classic (2015-2019)

NGK spark plug #3521/04 is a genuine OEM-quality replacement for V-twin motorcycles. Manufactured in Japan and distributed by Western Power Sports, this plug delivers reliable ignition for Harley-Davidson and Indian Motorcycle engines.

Features

• ILKR8Q7 can substitute for ILKR8Q
• BPR8ES can substitute for BPR8ES-S
• OEM-equivalent construction
• Manufactured in Japan

Specifications

• Brand: NGK
• Manufacturer Part #: 3521
• UPC: 087295135211
• Length: 3.2 in
• Width: 1 in
• Height: 0.7 in
• Weight: 0.05 lbs
• Country of Origin: Japan

Fitment

Fits V-twin motorcycles including Harley-Davidson and Indian Motorcycle models.

Frequently Asked Questions

Can I use ILKR8Q7 instead of ILKR8Q?

Yes — ILKR8Q7 is a direct substitute for ILKR8Q in compatible engines.

Can I use BPR8ES instead of BPR8ES-S?

Yes — BPR8ES can be used in place of BPR8ES-S.

Is this an OEM part or an equivalent?

This is a genuine NGK spark plug meeting OEM specifications, manufactured in Japan.

What motorcycles does this fit?

V-twin motorcycles including Harley-Davidson and Indian models — verify your specific year and engine type before ordering.