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Just changed mine. Got a 4 pack on ebay for 20 bucks.

Set 4 NGK Standard Spark Plugs for Yamaha FJ09 2015 Engine 850cc | eBay
Fits Yamaha FJ09 2015 Engine 850. Kit includes 4 Standard NGK Spark Plugs. 4 Standard Spark plugs. Note: Image is for reference only, actual product may vary slightly depending on your vehicle. SKU:CPR9EA-9 # 2308 STR1.
www.ebay.com