NGK SPARK PLUG #6684/4 6684-atv motorcycle utv parts accessories gear helmets jackets gloves pantsAll Terrain Depot
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  • In-House Experts

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  • Added Value

    Free basic installs for select purchases

  • USA Delivery

    Free shipping for orders over $99.99 (restrictions apply). Flat $8.99 Shipping for under $99.99

NGK SPARK PLUG #6684/4 6684



  • Listed price is for individual spark plug
  • Spark plugs sold individually
  • To receive box, order listed box quantity


Make Model Year
Cobra CX50 BW 2012
Cobra CX50 Jr 2012
Cobra CX50 Jr 2013
Cobra CX50 Jr 2014
Cobra CX50 Jr 2015
Cobra CX50 Sr 2012
Cobra CX50 Sr 2013
Cobra CX50 Sr 2014
Cobra CX50 Sr 2015
Polaris Freedom 2004
Polaris Freedom 2002
Polaris Freedom 2003
Polaris Hurricane 1997
Polaris Hurricane 1996
Polaris PRO 1200 2001
Polaris PRO 1200 2000
Polaris SL1050 1997
Polaris SL700 1997
Polaris SL780 1997
Polaris SL780 1996
Polaris SL900 1997
Polaris SL900 1996
Polaris SLH 700 2001
Polaris SLH 700 2000
Polaris SLH 700 1999
Polaris SLT 780 1997
Polaris SLT 780 1996
Polaris SLTH 1999
Polaris SLTX 1999
Polaris SLTX 1998
Polaris SLTX 1050 1997
Polaris SLX 2001
Polaris SLX 2000
Polaris SLX 1999
Polaris Virage 2004
Polaris Virage 2003
Polaris Virage 2002
Polaris Virage 2001
Polaris Virage 2000
Cobra CX50 Sr 2017
Cobra CX50 F.W.E. 2017
Polaris SLX 780 1996
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All Items Ship From The USA

Shipping and Delivery

Some products we sell are shipped directly from distributor warehouses around the country.

Although certain items are kept in stock, some products are custom made to order and require manufacturing time.

Expected ship dates are our best estimate based on past shipping times and are more than 90% accurate. Should an unexpected delay in shipping occur, we will notify you by e-mail (or letter) of the new projected shipping date, and provide you with an opportunity to keep your order, or cancel it for a prompt and complete refund.

In-stock items usually ship the same business day (weekends and holidays are not considered business days).

Please allow an additional 1 to 5 business days after the shipment date for delivery.

Free Shipping

Get Free Shipping on qualified items without hidden fees. 

All Terrain Depot has Free Shipping everyday for most product purchases over $99, saving you some valuable cash on your ATV/UTV Accessory products. Some restrictions do apply.

Here's the details:

  • Free shipping offer is valid only on qualified items. Eligible items are identified on their product information page. They can also be identified in your shopping cart. 
  • Shipping method will be selected by All Terrain Depot. Free shipping orders will be delivered via a standard ground shipping method selected by our direct-ship manufacturers/fulfillment centers.  
  • Not available on international, Alaska, Hawaii, Puerto Rico or APO/FPO orders. Only standard ground shipping orders to residential and commercial addresses in the continental US are eligible for Free Shipping.

Lost or damaged shipments

Items will not be replaced or refunded until carriers perform their investigation. This period ranges from a few days to a few weeks.

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