621-7411 N2 Spark Plug NGK CPR8E.  Replacement for MR7F.

SR-4

•Thread Diameter: 10mm
•Thread Reach: 19mm (3/4"), 5/8" hex
•Construction: Projected Center Electrode
•Type: Resistor
•Weight: 0.11 lbs

Fits Arctic Cat:
1000 GT / i (12)
1000 LTD (11)
1000 MudPro (16-17)
1000 TRV / Cruiser (09-12)
1000 XT (13-17)
450 XC (14)
550 4x4 GT EFI (12)
550 4x4 H1 TRV EFI (10-11)
550 GT/i (12)
550 H1 EFI (09-11)
550 LTD/i (11-14)
550 S H1 EFI (10-11)
550 TRV (09-10)
550 TRV Cruiser /TRV GT Copper (11-12)
550 TRV EFT (12-13)
550 TRV GT/i (11-12)
550 TRV LTD/XT (13-15)
550 TRV XT (16)
550 XT (13-14)
550/i (11-14)
650 4X4 H1 (05-08 & 10-11)
650 4x4 H1 Automatic SE (06)
650 4x4 H1 Automatic TBX (07 & 09)
650 4x4 MudPro H1 (10-11)
650 4x4 TRV (09)
650 H1 TRV (07-09)
650/i 4x4 (12)
700 4x4 Mud Pro (09-12)
700 4x4 Mud Pro LTD (11-15)
700 4x4 TBX (11)
700 4x4 TRV Cruiser (09-12)
700 EFI H1 Mud Pro (09-11)
700 GT EFI (12)
700 H1 4x4 EFI (08-11)
700 H1 EFI TBX (10-11)
700 H1 TRV (10-11)
700 HDX Crew XT (17)
700 HDX XT (16-17)
700 LTD (11-14)
700 MudPro LTD (16-17)
700 TBX (13-15)
700 TBX EPS (16-18)
700 TBX GT/ i (12)
700 TRV (10-11)
700 TRV EPS (16)
700 TRV GT/ i (11-12)
700 TRV LTD/XT (13-15)
700 XT (13-14)
700i Mud Pro EFI (12-13)
700i TRV Cruiser EFI (12)
700S 4x4 TRV EFI (10)
700S H1 EFI (10-11)
Alterra 1000 TRV XT EPS (17)
Alterra 550 (16)
Alterra 550 TRV (17)
Alterra 700 (16-17)
Alterra 700 TRV (17)
Mudpro 1000 (10 & 13)
Mudpro 1000 H2 EFI (11)
Mudpro LTD 1000/I (12-15)
Prowler 1000 H2 XTZ (11)
Prowler 1000 XT (15-17)
Prowler 1000 XTZ (09-14)
Prowler 550 (09 & 13)
Prowler 550 4x4 XT (10-15)
Prowler 650 H1 4x4 (07-08)
Prowler 650 H1 4x4 XT (07-08)
Prowler 650 XT (06 & 09)
Prowler 700 HDX (11-14)
Prowler 700 HDX XT (15-16)
Prowler 700 XT (09 & 15-17)
Prowler 700 XTX (08-14)
Thundercat 1000 / H2 (08-10)
TRV 1000 LTD (13-15)
TRV 1000 XT (15)
Wildcat 1000 (13-15)
Wildcat 1000 4 (13-14)
Wildcat 1000 4 LTD (14)
Wildcat 1000 GT (12-13)
Wildcat 1000 LTD (13)
Wildcat 4X (14-16 & 18)
Wildcat X (13)
Wildcat X/LTD (14-16 & 18)
XR 550/ XT (15)
XR 700 / XT (15)
Polaris:
450 HO 2x4 MD (16)
570 Sportsman 6x6 (17-18)
570 Sportsman 6x6 Tractor (17-18)
Hawkeye 325 (15)
Ranger 570 (16-19)
Ranger 570 Crew (16-19)
Ranger 570 EFI (14-15)
Ranger 570 Full Size (15-19)
Ranger 900 Diesel/4x4 Diesel/Crew (15-18)
Ranger 900 XP (15-17)
Ranger ETX 325 (15-16)
Ranger RZR 4 1000 (15-16)
RZR 1000 60 Inch (16-17)
RZR 1000 XP (15-16)
RZR 4 900 (15-18)
RZR 570 (12-17)
RZR 900 50/55 Inch (15-19)
RZR 900 60 Inch (15-19)
Sportsman 450 HO (16)
Sportsman 570 (14-16)
Sportsman 570 EFI (16)
Sportsman 570 EFI EPS (14-15)
Sportsman 570 EFI EPS Forest Quad (15)
Sportsman 570 EFI MD (15)
Sportsman 570 EFI UTE HD (16)
Sportsman 570 EFI UTE/HD (17-18)
Sportsman 570 EFI X2 EPS (15)
Sportsman 570 EFI/EPS Forest Tractor (15)
Sportsman 570 Forest (14)
Sportsman 570 Forest EFI EPS (14)
Sportsman 570 HD (14-15)
Sportsman 570 SP (15-18)
Sportsman 570 SP Touring (15-18)
Sportsman 570 Touring EFI / EPS (14-16 & 18)
Sportsman 570 X2 (16 & 18)
Sportsman 900 Ace (16-18)
Sportsman Ace 325 (14-16)
Sportsman Ace 570 (15-18)
Sportsman ETX 325 (15)