CHAMPION SPARK PLUG CJ8 #843 #843-1 Replaces RCJ8 CJ11 HT10J 018-3015-8 J91 JT8 JT8J UCJ7G UCJ8G BM4A BM6 BM6A BM6A10 BM7 BM7A BMR4A 5628 5728 5921 6321 6521, SELECT: Card or Shop Pack


  • Champion copper plus small engine plugs resist fouling and provide superior corrosion resistance
  • Feature a copper core electrode that provides increased conductivity and heat control while delivering good overall wear characteristics
  • Engineered to exceed OE designs and maximum durability
  • Designed for easy starting

  • Plug Type: CJ8
    Seat Type: Gasket
    Hex Size: 3/4 in
    Thread Size:  14 mm
    Thread Reach: 0.375 in
    Installed Height: 1.5 in (shorty)
    Gap: 0.027-0.033in   (0.69-0.84 mm)
  • Heat Range: 8
    Center Electrode Material: Nickel Copper Alloy
    Ground Electrode Material: Nickel Copper Alloy
    Classification: Champion Copper Plus Small Engine
  • Insulator Material: Zirconia Enhanced
    Resistor Plug: Non-resistor
MPN: CJ8 #843
UPC: 037551011094

Shop Pack plugs are from a Bulk Shop Pack and are shipped wrapped in individual bubble wrap units.

Purchase is for one spark plug.

USA domestic shipments are shipped USPS Ground Advantage Mail with Tracking