NGK Spark Plug #6637 - Indian Chief, Scout, Spirit
About NGK
NGK parts and accessories are stocked at Vtwinbikers for Harley-Davidson and Indian Motorcycle applications. Every NGK item we list is new and sourced through authorized distribution. If you are not certain a part matches your year and model, use Shop by Bike or email our team before you order and we will confirm fitment first.
Ensure your Indian Chief, Scout, or Spirit maintains peak ignition performance with the NGK #6637 spark plug. This genuine replacement component is engineered to OEM specifications, delivering reliable cold starts and consistent combustion across the RPM range for your V-twin motorcycle. It's a fundamental upgrade for smooth power delivery.
Why riders pick this
- Genuine NGK manufacturing for trusted performance
- Designed for Indian V-twin motorcycle fitment
- Cross-compatible with specific NGK plug variants
- Ensures reliable cold starts and consistent combustion
A healthy spark is the heart of a well-running V-twin, and the NGK #6637 spark plug is designed to keep your Indian Motorcycle firing strong. This plug provides consistent, powerful ignition, crucial for optimal fuel burn and engine responsiveness. Don't compromise on the quality of your ignition components when chasing performance.
Reliable Ignition for Indian V-Twins
- Genuine NGK manufacturing for trusted quality
- Designed for V-twin motorcycle fitment
- Cross-compatible with ILKR8Q7 and BPR8ES variants
- Ensures consistent combustion across the RPM range
Maintain Your Bike's Edge
Whether you're performing routine maintenance or chasing every last bit of torque from your Indian, fresh spark plugs are essential. The NGK #6637 helps prevent misfires and ensures your engine operates efficiently. Always consult your motorcycle's owner's manual to confirm the specific plug required for your model and year before installation.
Specifications
- Brand: NGK
- Manufacturer Part #: 6637
- UPC: 087295166376
- Length: 3.2 in
- Width: 1 in
- Height: 0.7 in
- Weight: 0.1 lbs
- Country of Origin: Japan
Common questions
What motorcycles does this NGK spark plug fit?
The NGK #6637 spark plug fits most V-twin motorcycle engines, including Indian Chief, Scout, and Spirit models. Please verify your specific model's requirements in your owner's manual before ordering.
Can I use ILKR8Q7 or BPR8ES instead of this spark plug?
Yes, ILKR8Q7 can substitute for ILKR8Q, and BPR8ES can substitute for BPR8ES-S. It's important to cross-reference with your original part number and motorcycle's specifications first.
How often should I replace this spark plug?
Follow your motorcycle's service schedule for spark plug replacement, which is typically every 10,000–20,000 miles, depending on your riding conditions and engine type.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | NGK |
| TYPE | Spark Plugs |
| SKU | 2-BPR6EIX |
| WEIGHT | 0.1 lb |
