ELECTRICAL SECTION RED PART NUMBERS INDICATE NEW PARTS 1-107 1 2 3 4 5 6 7 8 9 10 11 CONTENTS ELECTRICAL FRAME FRONT END CONTROL WHEEL ENGINE DRIVE TRAIN FUEL EXHAUST GENERAL REFERENCE Spark Plugs Champion Description Reference Part # Cold Plug RC9YC 18041B Rpls. Rpls. Champion Model & Year HD Code HD Gap Reference Part # All Big Twin Cold Plug 1948/1974 3-4 32301-60 .025 J12YC 18037E 1200cc Shovelhead all models 1975/Later with Points 5A6A 32312-78A .025 N12YC 18035B Hot Plug 1200cc & 1340cc Shovelhead all models 5R6A 32311-83 .040 RN12YC 18033B Late 1977/1981 with Electronic Ignition Hot Plug 1340cc Evolution 1984/Later Electronic Ignition 5R6A 32311-83 .040 RN12YC 18033B Hot Plug Twin Cam all models 6R12 32317-86A .040 RA8HC 18036E K Models and Sportster 1952/1978 - 900cc 4 32301-47A .030 H8C 18039E Cold Plug 1000cc 31629-78 Ironhead Sportster 1979/Later 1000cc 4R5 32301-80 .040 RL82YC 18038E Sportster Evolution all models 1986/Later 6R12 32317-86A .040 RA8HC 18036E CHAMPION COPPER PLUS SPARK PLUGS OE Fit Spark Plugs Patented Resistor High voltage semi conductor resistor for maximum EMI suppression, proven to be the most durable in the industry. Certified compatibility for use in modern computer controlled, distributorless ignition systems. Triple Seal Assembly Use of upper and lower metal gasket along with sillment seal provides strongest yet least stressful seal known to the industry. Eliminates spark plug failure due to heat or mechanical induced stress. Copper Core Center Electrode Provides maximum heat dissipation and durability. Precision Rolled Threads Conforms exactly to I.S.O. and S.A.E. standards as specified by all engine manufacturers, resulting in easy installation and removal. Five Rib Near Diamond Hard Insulator Patented, zirconia toughened alumina insulator for near diamond hardness. Five rib design increases strength 35%, while insuring against ignition flashover and securing the plug boot seal. Rust Resistant Shell Finish Zinc plated shell resulting in maximum corrosion resistance. Also serves as thread lubricant to aid in prevention of thread seizure. Convenient shop pack of 24 of the most popular selling Champion spark plugs, the RN12YC. Fits all Big Twin Evolution and Shovelhead models 1975/Later with electronic ignitions. (Rpls. HD 32311-83 and HD 5R6A) Big Twin with Dual Plug Heads, 5/8” hex plug for socket clearance on the pushrod side. These Resistor Plugs have 14mm thread diameter & 3/4” reach. Shop Pack Part 18032T COPPER PLUS RN12YC Special Use Plugs
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