Copper Plus
Fits KTM, Cobra, Ski-Doo & more — 9 vehicle applications
Spark Plug
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$92 from the free-shipping threshold
- Canadian Owned
Champion Spark Plug 821-1 Vehicle Fitment
Fits 9 vehiclesThis Copper Plus fits KTM, Cobra, Ski-Doo, Kawasaki and 1 more makes vehicles.
Fits 1960-1969 BMW R50/2; 1997 Cobra KING; 1971-1975 Kawasaki F7; 1972-1975 Kawasaki H1 Mach III; 1974 Kawasaki KX450; 1998-1999 KTM 50 Mini Adventure; 1978 Ski-Doo Citation 300; 1978 Ski-Doo Olympique 300T. Plus 1 more models listed below.
1974 Kawasaki KX450
1972-1975 Kawasaki H1 Mach III
1971-1975 Kawasaki F7
Champion Spark Plug 821-1 Specifications
- Plug Type
- L77JC4
- Seat Type
- Flat
- Hex Size
- 0.813
- Hex Size
- 20.650
- Hex Type
- Hex
- Thread Diameter
- 14.000
Champion Spark Plug 821-1 Interchange Numbers
This part replaces and is compatible with the following part numbers
| Type | Brand | Part Number |
|---|---|---|
| Aftermarket | Champion Spark Plug | L77JC4 |
Champion Spark Plug 821-1 Product Description
Champion Copper Plus Small Engine 821-1 Spark Plug L77JC4
Key Features
- EASY TO INSTALL -- Pre-gapped design simplifies installation
- OE-QUALITY FIT -- Built to meet OE fit, form and function for dependable performance
- DEPENDABLE STARTS -- Engineered for reliable ignition in all weather conditions
- COPPER CORE PRECISION -- Copper core center electrode allows accurate control of heat range, delivering longer life and dependable performance
- CORROSION RESISTANCE -- Coated shell provides corrosion resistance in harsh environments
- BUILT-IN NOISE SUPPRESSION -- Modern resistor technology protects sensitive electronics by minimizing electrical interference
Champion® Copper Plus® spark plugs deliver dependable ignition performance with proven copper-core technology. The copper core electrode provides excellent conductivity and optimized heat control for consistent sparks while the coated shell protects against corrosion. Champion your engine with spark plugs engineered to improve efficiency and keep your vehicle running at its best.
About Champion Spark Plug
Shop Champion Spark Plug Spark Plug at Autrex with vehicle fitment details, current pricing, and checkout options for the Champion Spark Plug 821-1. Eligible orders over $99 may qualify for free shipping, with some exceptions.
Seller reviews
What customers say about buying from Autrex — service, shipping and support. These are reviews of the store, not of this specific part.
- July 2026
Couldn't locate the parts for 2013 Civic Si Sedan. Front struts are an Anomaly found them at Capital autoparts. Great service and great parts. Shipping by CanPar sucked however
- July 2026
Great customer service. I placed an order for wheels and tires and it was an easy transaction. Make sure you read the expected lead times for delivery however. I misread that part, but the order did arrive in the correct timeframe stated. The Hostile rims and Hercules tires look great. Thank you
- July 2026
Awesome
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Frequently Asked Questions — Champion Spark Plug 821-1
What vehicles does the Champion Spark Plug 821-1 fit?
The Champion Spark Plug 821-1 fits 9 vehicle applications including 1998-1999 KTM 50 Mini Adventure, 1997 Cobra KING, 1978 Ski-Doo Citation 300, 1978 Ski-Doo Olympique 300T, 1976 Ski-Doo RV 250 and 4 more. Check the full fitment list above to confirm your vehicle.
What parts does the Champion Spark Plug 821-1 replace?
The Champion Spark Plug 821-1 is a direct replacement for Champion Spark Plug L77JC4. See the full interchange list for all compatible replacements.
How do I confirm the Champion Spark Plug 821-1 fits my vehicle?
Select your year, make, model and engine in the vehicle selector on this page to see a fit or does-not-fit result for the Champion Spark Plug 821-1. If your vehicle has options that change the part (for example brake package or axle), the result lists the questions to check. A parts specialist can also confirm fitment at 1-866-461-2787.
What are the shipping options for the Champion Spark Plug 821-1?
Shipping options for the Champion Spark Plug 821-1 are shown during checkout and may vary by item, address, and availability. Eligible orders over $99 may qualify for free shipping, with some exceptions. Call 1-866-461-2787 if you need help confirming shipping or pickup before ordering.
How much does the Champion Spark Plug 821-1 cost?
The Champion Spark Plug 821-1 is currently listed at $7.00 CAD at Autrex. Final price, shipping, taxes, and availability are confirmed during checkout. Call 1-866-461-2787 if you need help before ordering.
Is the Copper Plus a direct fit replacement?
Fit depends on the vehicle and its configuration. Select your vehicle and review the fitment result for the Copper Plus before ordering.