Champion Spark Plug 840

Description

The Champion Spark Plug 840 (RCJ8) is a dependable OE-type replacement spark plug designed for consistent ignition performance and long service life. Its copper core center electrode helps improve conductivity and heat control, supporting reliable starts, reduced fouling, and steady wear across a wide range of compatible outdoor power equipment, utility engines, and industrial applications.

Built to ISO and SAE standards, this Champion Copper Plus plug is designed for standard replacement use in handheld equipment, blowers, trimmers, chain saws, edgers, generators, pumps, and other small engine applications. The resistor design, J gap configuration, non-removable nut terminal, and crush washer help support dependable operation and broad fitment in compatible equipment.

Features

• OE-type replacement spark plug
• Champion Copper Plus Small Engine classification
• Dependable performance and durability
• Copper core center electrode for improved conductivity and heat control
• Resists fouling
• Superior corrosion resistance
• Built to ISO and SAE standards for proven performance
• Plug type: RCJ8
• Part description: Spark Plug
• Grade type: Standard Replacement
• Center electrode tip material: Nickel
• Center electrode design: Standard
• Center electrode diameter: 0.09 in.
• Ground electrode quantity: 1
• Ground electrode tip design: J Gap
• Ground electrode tip material: Nickel
• Ground electrode core material: Nickel
• Ground electrode material: Nickel Copper Alloy
• Pre-gap size: 0.030 in. / 0.76 mm
• Hex size: 0.748 in. / 19.000 mm
• Manufacturer heat range: 8
• Seat type: Flat
• Reach: 0.375 in.
• Thread diameter: 0.551 in. / 14.000 mm
• Resistor type: Yes
• Electrical terminal type: Non-Removable Nut
• Hex type: Hex
• Washer included: Yes
• Washer type: Crush
• Indexed: No
• Installed height: 1.64 in.
• Taper diameter: 0.32 in.
• Gap style: J Gap
• Subject to Prop 65: No

Vehicle Fitment

Agricultural, Industrial, Construction, and Equipment Fitment

Compatible with listed applications including, but not limited to:

• AGCO Allis — 1717H
• Aggressor — Base
• Air-Brooms — Base
• Allis-Chalmers — 65, 75, 75A, 195, 295
• Amerind-Mackissic — Base
• Astron — 150, 200, 250, AS-110, E-202, E203DC, HT-766, HT767, HT767T, HT-830, HT838, KFS4-12AD, KFS4-24DX, KFS4T-25G, PK2500F, PK2860G, PK3330G, Pro 750E, Super 100, Super 150, Super 160, S160ED8
• Beaird-Poulan — 770, 800, 900, 940, 960
• Black Rock — Base, Grass Trimmer, Hedge Trimmer
• Blue Bird / BlueBird — Base, K25, K29, M34, SA38E
• Bobcat — Base, Edger, Trimmer
• Brouwer — Base
• Broyhill — Base
• Bunton — Base, C-18, C-21, Dilly 4, Duzmore 18", Lawn Lark, LBF-18K, LBF-18KT, LBS-24K, LBS-24KT, LBS-33K, LBS-33KT, Model B
• Bush Hog — Base
• Carmec — M34, M45, M47
• Carter Brothers — Base
• Chief — D15, E75, E95
• Chrysler Power Bee — Base
• Clarke — 830, 850, Base
• Clinton — Base, D15, D25, E75, E95
• Coleman — Base
• Comet — D-4, D-58
• Cooper — Base
• Cornell — Base
• Cosco — Base
• Craftsman — Base, 1.8, 1.9, 1.9PS, 2.0, 2.1, 2.1A, 2.7, 3.6, 4.3, 3400, 3401, 3402, 3408, 34071, 34094, 3411, 3412, 3415, 3416, 3418, 3425, 3455, 3460, 3461, 3465, 3466, 3476, 3481, 35082, 35091, 35093, 35094, 35096, 35201, 35202, 35203, 35205, 35206, 35207, 35209, 35211, 35215, 35232, 35238, 35251, 35255, 35256, 352060, 352063, 352065C, 352066?, 352351, 35263, 35265C, 35266, 35267, 35363, 35366, 35367, 35369, 35371, 35373C, 35377C, 35505, 35506, 35512, 35514, 35515, 35516, 357120, 357160, 358.353660, 358.353670, 358.353690, 358.354830, 358.354870, 358.355060, 358.355061, 358.355070, 358.355071, 358.355141, 358.796920, 358.796921, 358.796982, 358.797930, 358.797970, 358860, 36212, 36235, 536.772300, 536.797420, 536.797470, 536.797480, 536.797540, 536.797571, 580.328330, 580.751500, 580.751510, 59716, 59741, 59816, 59886, 610.281514, 610.282, 714.3A/VL, 795440, 795800, 795900, 79692, 917.273421, Gamefisher 298.585070, Gamefisher 298.586130, Gamefisher 298.586190, Gamefisher 298.586193
• Cross — Base
• Cub Cadet — Base, 55, 75, 76, 80, 81, 85, 111, 182, 282, 382, 482, Z-Force 15 53AA5D2L100
• Cushman — Base, Minute Miser
• Cushman OMC — Truckster/Haulster — 1968-1980
• Davis — Commando
• Dayton — Base, 2Z-461, 2Z-462, 2Z-463, 2Z-463B, 2Z-573, 2Z-760, 2Z-970, 2Z-970B, 2Z-971, 4Z-022, 4Z-023, 4Z-023B, 4Z-109, 4Z-109C
• DeVilbiss — PLE-501EG, PLE-502EG, PME-501EG, PME-502EG, UALE-5030EG
• Diadem — 316, 427
• Digz-All — All Model(s)
• Dolmar — 103, 105, 108, 309, 343
• Dyna — Base
• Dyna Mow — Base
• Dynamark — Base
• Earthquake (Ardisam) — MC43, MC43E
• Eaton — 8930, 8932-3
• Echo — 60S, 80Z, 100, 301, 302, 302S, 304, 315, 330, 351VL, 451VL, 452VL, 601, 601S, 601SVL, 602EVL, 650EVL, 701SVL, 701VL, 801, 802, GT100, GT1000, GT140, GT140A, GT140B, GT160, GT160A, GT160AE, GT200, GT200A, GT200B, GT200BE, GT200CE, GTL140, GTL140A, HC1000, HC1001, HC140, HC150i, HC160A, HC200AE, HC210AE, HC210E, KEH202D, MB400, PB9, PB202, PB400, PB400E, SH8000R, SRM140D, SRM140DA, SRM200, SRM200AE, SRM200BE, SRM200CE, SRM200D, SRM200DA, SRM200DB, SRM202DA, SRM202FA, SRM210AE, SRM210E, SRM300, SRM300AE, SRM300AE/1, SRM300E, SRM300E/1, SRM302ADX, TP2001, WP2000, WP2001, WP3000
• Edko — Base, Convertible Till-Trac
• Electro-Magic — 1800-5, 2000-6, 4700GED
• Encore — Base
• Enviroboom — Base
• Exmark — Base
• Ferris — Base
• Finn — Base
• Falls Roto Clipper — Base
• Ford — Eagle I, Eagle II, Hawk, 960.1, 960.2
• Frigidaire Home Products — Base
• General — Base
• Gen-Pro — GP-40, GP-40E, GP-48, GP-48E
• Generac — Base
• Giant Mow — Base
• Giant-Vac — Base
• Gilson — All Model(s)
• Golden Boy — Base
• Golden Star — Base
• Goodall — Base
• Gould — Gas Pump Model DU
• Gravely — Base, 150 Series, 200 Series, 816S, Convertible 8
• Green Acres — Base
• Green Machine — 1700, 1730, 1900, 1900e, 1900EM, 1930M, 1940M, 2000, 2100, 2100SP, 2200, 2300 Series, 2400, 2400M3, 2500, 2600, 2600h, 2600j, 2800, 2840, 3000, 3000b, 3000j, 3000M, 3000SS, 3040M, 3510, 3540, 4000, 4000b, 4000j, 4000M, 4500, 4600bp, 4600K, 4600LP, 500e, 7100, 7200, 7400, Port-a-Flo
• Grow Gear — Base, Edger
• HMC — Base, Earth Drill
• Hale Fire Pumps — 15B, 15FC-B23, 15FD-B23, 15TA-B6, 20FD-B32, 20GA-B8, 20GP-B8, 20TA-B8, 20TA-B23, 20TN-B13, 25FA-B23, 25FZZ-B23, 30FZA-B23, 30GA-B8, 30GP-B8, 30TA-B23, 40GC-B19
• Hoffco — Base, 1493, AV52, Big Li'l Hoe, D4, D58, EC01R, EC02R, F2/2, G1AH, H1AH, HB220, JP300B, JP300C, JP300F, JP390A, JP390C, MP633, PH1100, S480, SE301, SE301F, Super 510, T4, T58, WT250C, WT250F, XL
• Home-Gard — Base
• Homelite — 270S2-1, 270S2-1P, 270TP2-1, XLS1-1/2-1, XLS1-1/2-1H, XL100A, XL12, VTP4
• Homelite-Jacobsen — 23, 24, 33, Base, HK18, HT18
• Honda — Base, EX350, HR21
• Houchin-Ruhmann — Base
• Husqvarna — Base, 25H, 26H, 140B, 225HBV, 321S15, 321S25, T25RS
• IBP — 200, 300, 500
• Ice King — Base
• Indian — 40, 5-12, 547H, Super 5-12
• International — 10, Model 8
• JCPenney — 709030, 709035
• Jacuzzi — 5M, 8M, 10M, 15M, 15ZJH, 1ZRM2
• Jacobsen — Sno-Blitz
• Jim Savage — Maxi 350, Pro 580, Super 100
• Jobu — Base, 20D, 25CVA, L35, Micro 25, Micro 25CVA, SL3, SL35
• John Deere — Base, 2, 2BV, 2LS, 4, 5E, 20SR7, 21HC, 23, 28, 30, 40V, 50, 55V, 60V, 108, 111, 113, 162, 172, 1800, 213E, 225, 285, 300G, 325, 350G, 375, 445, 500, 550, 650, 750, 1000, 1400, EH2342, EH2659, H20D, H20S, H26S, LX178, LX188, PS2683, RX63, SE23, T23S, T26SB, T40SB, T105C, T105S, TB26SB, XT105, XT105SB, XT120, XT120SE, XT140, XT140B, XT140SB, XT170, XT170B, XT170SB?, XT250B
• Kaaz — 110, J Series, KT12, KT18, Silver X, TM30B, V Series
• Kan-Du Stumper — Base
• Karcher — Base
• Katex — KAT-10, KAT-25, KAT-25DAEX
• Kawasaki — AS, Base, GA550A1, GD550, GD700A, GD700A1, GD700AS1, KG? not listed here, Ninja 700
• King O'Lawn — Auger MK VII, Mark II
• Kioritz — Base
• Klopping-Hardie — Base
• Kohler — Base, 1.75MBFM, 2.25MBFM25, 2.25MBFM45, 3.5MBFM45, 3.5MBFM65, 3.5MBM25, 3.5MBM65, 5MBM25, 5MBM65
• Komatsu Zenoau / Zenoah — Base, BC153E1
• Kubota — Base, T1760, T1770, T1870, TG1860
• Kwik-Way — Base
• Lancaster — 50/IL, 50HL, 555, 560, 600HL, 700HL, Mini Auto, Mini-Twelve, SLA/20
• Lawn-Boy — Base, 522R, ST524
• Lesco Equipment — Base
• Little Wonder — Base, Mantis
• Lombard — 3, 3-1/2, 3A, 5, 5A, 30, 34, 35, 36, 37, 68, 69, 70, L30, L50, L55, L60, L70, L80, L90, L100, Super L30, Super L50, Super L60, Super L70, Super L90, F54
• Makita — RBC255, RBC321, RBL25A
• Maruyama — BL230, BL400, BL471, BL480, BL4000, HT210L, HT250, HT250L, MP2500E2, MP2520EZM, MP2531CE-1CA, MS410-100TH, MS410EC-2MR
• Mark Machine — 2800, 2840, 3000M, 3040M, 4000M
• Massey-Ferguson — Base, 370, 370A, 370AR, MF85
• Matelest — MAT-101-10, MAT-101-12, MAT-106, MAT-EX
• McCulloch — 2335J, 2635B, 2635GLE, 3335L, 4335B, GHT2024, GHT2030, Pro Mac 2320L, Pro Mac 2635J, RA120, RA150, RA200, RA330, RA330ES, Base
• Menning — Base
• Mi-T-M — 2004
• Mi-T-Vac / Mity-Mite — Base
• Mitsubishi — Base, MG1300-D, MG2000-D, MG3000-D, MG650-D, MP-25, MP-40, MP-50, MP-80, MP-100, TL20, TL23, TL26, TL43, TL52
• Mono — 25-10, 25-14, SL146, SL147, SL245
• Monarch — 2JAG, 2JG, 3JAG, 3JG, 4-SG, 5ACGF-6, 5ACGF-8, 6-SG, 8MG, 10XG, 10XWG, 11XG, 11XWG, ACG-4, ACG-5, ACG-6, AGG-4, AGG-5, AGG-6, AOG-4, AOG-5, AOG-6, BVG-4, BVG-5, BVG-6, BVG-8, BSG-4, BSG-5, BSG-6, BSG-8, BSGF-6, BSGF-8, C3-SD, C6-SDBS, FFN25, FFS15, NG1.5L8S, NG5B, NSPG5B, PBG-6, PBG-8, PBG-12, PBGF-6, PBGF-8, PBGF-12
• Montgomery-Ward — 1926, 1927, 24100, 24100-1, 24102, 24102-9, 24103, 24103-6, Many Model
• Nac — Base, NX180, NX240, NX350
• Nauder — NAU-10, NAU-12
• Nissan — GX1000, GX1600
• Nogmatic — 4CV-All, NOG10, NOG12
• Nac — Base
• O & R / Orline — Base, Orline, Mustang 13, Mustang 129, Mustang 149, Yard Arm, Challenger Mark 11D, Challenger Mark 11S
• Olathe — High Lift
• OMC — Base
• Paramount — 8014, 8021, GB150, GB350
• Paragon — Base
• Parker — Base
• Peerless — D25, E75, E95, 141A
• Pemco — Base
• Pioneer — 20, 20D, 2200, 2270, 2400, 2400 (Sub-Zero Op), 2460, 2460 (Sub-Zero Op), 3071, 3200, 3270, 3270S, 1074, 1074E, 1074UB, 1100, 1110, 1120, 1130, 1150, 1160, 1200, 1200A, P21, P21B, P21S, P21SB, P26E, P28, P28B, P28E, P28S, P28SB, P35, P35S, P40 Light Service, P41S, Farmsaw, Farmsaw II
• Plus Power / Powermate / Power Products — Base, Powerweld 140, 1500, 3000
• Poulan / Poulan Pro / Poulan Pumps — 15-AR, 19-7, 19-24-8AR, 20, 20D, 24 Deluxe, 25, 25DA, 25SN, 26-10, 26-TM, 71A, 72, 76, 92, 100, 225A, 245A, 252A, 306, 306A, 306SA, 361, 420, 442, 452MVB, 5200CVA, 770, 800, 900, Micro 25, Micro 25 Deluxe, Micro 25CVA, Micro MZ5, Micro Super 25, Micro XXV, Model XX, P-26-TM, PP200, PP442, S25, S25AV, S25CVA, S25DA, S68, S72, Super XXV, 3H-5M, 3H-8M, 3H-151, 5H-10M, 5H-173, 5H-212T
• Powermate — PM800
• Power Products — Base
• Pro-Master — Base
• Pullman — Base
• Redline — SA45
• Redmax — AG230, BC200, BC200DL, BC260DL, BL220DL, BT17, BT200, BT220, BT221, CHT230, CH232, CH232L, EDG230, HT230, HT231, HT232, HT232L
• Reiner — ERF2, ERF3
• Remington — 44", 305, 340, 380, Clodbuster
• Ridgid — 305, 380, 590, 690, 850
• Ring Saw Co. — Base
• Riston — Base
• Robin — Base, BE221, BE26X, BEH2500, BH2500, BH2500A, BH2500AU, BH3500, BH3500AU, HT221, HT231T, HT750, HT750-40, NB02, NB02-2A/B, NB16, NB26, NB26AU, NB27, NB27AU, NB31, NB31AU, NB50L, NB211/A/AV/AW, NB211C, NB231C, NB251, NB252, NB281, NB281AU, NBF020, NBF251, NBF252, NBKT415, NBT415, NF500, RS02, RS02B, RS401, SDT250, SDT400
• Root — Base
• Roper — Base
• Ryobi — RD260, RD330, RD420
• S & R Pro Chip — Base
• SNG — Base
• Sachs — Base
• Sak-Vac — Base
• Saturn — Base
• Scag — Base
• Shindaiwa — 22F, 22T, 22DH, 210, 220, 254, B40, B45, BP35, BP450, C25, C27, C35, C230, C250, C282, C350, DH230-30, DH230-40, EB45, EB240, EB240S, EB480, EB500, EB501, EC350, ES726, F18, F20, F21, F230, GP25, GP45, GP450, HT20, HT20-30, HT20-40, HT230, HT230-30, HT230-40, HT231, LE230, LE231, LE250, LE260, LE261, LT20, M242, P230, P231, PB230, RC45, T18, T20, T25, T27, T230, T230 Limited, T230X, T231, T250, T350
• Simplicity — Base, Wonder-Boy 400, Wonder-Boy 450, Wonder-Boy 575, Wonder-Boy 600, Wonder-Boy 700
• Skibbe — All Model(s)
• Skil / Skilsaw — All Model(s), 628-T1, 628-T2, 1620, 1622, 1624, 1634, 1636
• Smc / SMC — Base
• Snapper — Base
• Solo — 400, 506, 611, 642
• Spartan — PC22, PCE24, TR22
• Spray Kote — All Model(s)
• STIHL — FC44, FC72, FS36, FS44, FS44J, FS44R, FS50, FS51, FS56AVRE, FS60, FS61, FS65, Super Rake
• Sunbeam — Base
• Suzuki — SE700-A
• Swish-Err — Base
• Tanaka — 23, 25, 160, 162, 202, 205, 2120, 215, 220, 230, 232, 260, 262L, 262R, 322, 373, 422C, 425, 450, 4600, 501, 120B, 120C, 205, 220, 230, 232, 2501? plus model-specific units including ECS-290, ECS-300, ECS-307, ECS-320, ECS-330, ECS-3301, ECS-3351, ECS-350, ECS-3500B, ECS-351, ECS-355, ECS-356, ECS-357, ECS-35, ECS-35B, ECS-35E, ECS-370, ECS-405, ECS-415, EHC-120, EHC-140, EHG-120, PHT-15, PHT-25, Q22, QCP-12, QCP-121, QEG-250, QEG-300, QIA-10, QUM-2, QUM-2N, SP-502, SUM-3, SUM-301, SUM-321, TBC-16, TBC-23, TBC-200, TBC-218, TBC-225, TBC-235, TBC-240, TBC-245, TBC-2500, TBC-2501, TBC-260, TBC-265, TBC-270, TBC-290, TBC-300, TBC-340D, TBC340PF, TBC-4010, TBC-4110, TBC-422C, TBC-425, TBC-501, TBL-2510, TBL-2500, TBL-30, TBL-500, TBC250D, TBC250PF, TBC340D, TED23, TED-232, TED-260, TED-262DH, TED-270PFDLS, TED-270PFDH, TED-270PFL, TED-270PFHS, TED-270PFLS, TED-270PFR, TED-270PFRS, TEA-500, TEC-265, THT-16, THT-162, THT-200, THT-212, THT-23, THT-230, THT-232, THT-262, TIA-302, TIA-305, TOB-25, TOB-120, TOB-150, TOB-175, TOB-300, TPH-230S, TPH-230SS, TPH-2501, TPH-2501S, TPH-2501SS, TPH-250PF, TPH-250PF, TPH-260PF, TPH-270S, TPH-270SS, TSD-23, TST-218
• Taral — 50MP, MPG5014, MPG5026, MP5014, PIA
• Tas — Base
• Thew — MC415W, MC424, MC424W, MC425, MC524, SP424, SP524
• Thomas — All Model(s), T4200, T8200
• Tomstar Plug'R — Base
• Toro — Base, 51620, 51638, 51652, 51653, 51660, 51675, TC1000, TC2000, TC3100, TC3500, TC5000, All Other 4-Cycle Engs.
• Troy-Bilt — 12060 Tuffy, 12061 Tuffy, 12077 Tuffy, 12155 Tuffy, CV4310
• Tru-Cut — Base
• Trim-All / Trim-It — Base
• U.S. Motors — Base, USM-100-2
• Universal — Aquamaster
• Vac-Master — Base
• Vandermolen Windmill / WIC / White Motor Co. / White — numerous L-, F-, X-series windmill and engine-drive models plus WM19, WM21, WM360 and White Base
• Vigor — 1E36F
• Village Blacksmith — Base
• W-W Grinder — Base
• Weed Eater — Base, 599, 609, 698, 920, 925, 940, 1920, 1925, 1960, XR200
• Wheel Horse — Base
• West Bend — Base
• Whipper Clipper — Base
• White — Base
• White Motor Co. — WM19, WM21, WM360
• WIC — L1845G, L2035G, L2415G, L2525X, L3335G, X3335G
• Winco — Base
• Wizard — 010, 012, 014, 110, 112, 212, 314, 316, 420, 430, 430B, AV10, AV14, AV16, Base
• Wright — 104, 104D, 111, 121, 122A, 122CVA, 137A, 140, 141A
• Yard Pro — YP200
• Yazoo / Yazoo-Kees — Base

Powersports, Motorcycle, ATV, Snowmobile, and Personal Watercraft Fitment

• Kawasaki — Ninja 700
• Craftsman Gamefisher — 298.585070 — 1 30.5cc/1.86cid
• Craftsman Gamefisher — 298.586130 — 1 22cc/1.39cid
• Craftsman Gamefisher — 298.586190 — 1 50cc/3.05cid
• Craftsman Gamefisher — 298.586193 — 1 50cc/3.05cid

Additional Engine and Power Unit Fitment

Also listed for numerous standalone engine and power unit applications, including:

• 50000 / 50002 / 50004 / 50006 / 50012 / 50014 / 50052 / 50054 / 50056 — listed engine and equipment applications
• Base 502 / Base 503 — listed engine and equipment applications
• 13A / 13B / 20A / AH36 Type 70 / AH44 / AH48 / AH49 / EC01ER / EC02EHR / EC02ER / EC12D / EC13V / EC22GR / E020G / EH09 / FA76D / FA130D / FA210D,R / FA210V / FD501D / FD590V / FD611D / FD611V / FD620V / FD661D / G1A / G1A6 / G1E / G2A / G2E / G270 / G351 / G400 / G400PV / G511 / G711 / G711A / G911 / G1050 / G1050A / G1200 / G1500 / GV150 / GV400 / GV400K1 / H35 / H40 / K662 / KT12 / KT12AD/J / KT18 / KT28 / M8 / Q22 / QEG300 / T23 / T30 / T50 / T80 / T110 / T130 / T140 / T170 / T180 / T200 / T240 / T280 / T340 / T350 / T430 / TD18 / TD24 / TD33 / TD40 / TD48 / TE40-MX / TF22 / TG20 / TG24 / TG28 / TM18 / TM21 / TM24 / TM33 — listed engine and equipment applications
• Selected engine details listed — FD501D V2, FD590V V2, FD611D V2, FD611V V2, FD620V V2, FD661D V2, GV400/GV400K1 406cc/28.1cid, K662 1101cc/67.2cid