9.22 9 KB Forged Performance Pistons Computer designed to give a lightweight yet strong piston. Forged out of 4032 low expansion 11% silicon alloy. This design and material along with an Accumulator groove between top and second ring produces a better ring seal. They also feature top land mini grooves which help reduce detonation. Anti-Friction Coated Skirts on piston sets are noted. All kits include: 2 forged pistons, 2 sets of Ductile Iron Moly coated rings, pins, locks and assembly lube. All pistons listed on this page are “Sold as a Pair” For Twin Cam 88 Models From 9906 3.875“ Bore with 4.000 Stroke/ 88“ to 95“ (.008“ Dome w/ -1cc) with Coated Skirts / 9.25 Compression 650960 Standard 650961 +.005“ oversize 650962 +.010“ oversize 3.875“ Bore with 4.000 Stroke/ 88“ to 95“ (.117“ Dome w/ -6.7cc) with Coated Skirts / 10.0:1 Compression 650967 +.020“ oversize For Twin Cam 88 Models From 9906 4.125“ Bore with 4.000“ Stroke/88“ to 107“ (.077“ Dish w/ +9.4cc) with Coated Skirts / 9.5:1Compression 650867 Standard 650868 +.005“ oversize 650869 +.010“ oversize 650870 +.020“ oversize 4.125“ Bore with 4.000“ Stroke/88“ to 107“ (.077“ Dish w/ +3.6cc) with Coated Skirts / 10.0:1 Compression 650976 Standard 650977 +.005“ oversize 650978 +.010“ oversize 650979 +.020“ oversize 4.125“ Bore with 4.000“ Stroke/88“ to 107“ (.021“ Dome w/ -1.5cc) with Coated Skirts / 10.5:1 Compression 650980 Standard 650982 +.010“ oversize 4.000 Bore with 4.375“ Stroke/96‘‘ to 110“ (.037“ Dish w/ +7.1cc) with Coated Skirts / 10.0:1 Compression 650984 Standard 650987 +.020“ oversize 4.000 Bore with 4.375“ Stroke/96“ to 110“ (.033“ Dome w/ -.5cc) with Coated Skirts / 10.5:1 Compression Note: Will also fit Screamin Eagle 95cc Heads 9.6:1 Compression 650988 Standard 4.125 Bore with 4.375“ Stroke/96‘‘ to 117“ (.157“ Dish w/ +19.0cc) with Coated Skirts / 9.5:1 Compression 650875 Standard 650876 +.005“ oversize 650877 +.010“ oversize 650878 +.020“ oversize 4.125 Bore with 4.375“ Stroke/96‘‘ to 117“ (.030“ Dish w/ +7.2cc) with Coated Skirts / 10.5:1 Compression 650879 Standard 650880 +.005“ oversize 650881 +.010“ oversize 650882 +.020“ oversize For Evolution Big Twins from 84-99 3.498“ Bore with 4.250“ Stroke/ 80“ (.100“ Dome w/ -8.5cc) / 9.5:1 Compression 650943 +.010“ oversize 650944 +.020“ oversize 3.498“ Bore with 4.250“ Stroke/ 80“ (.220“ Dome w/ -16.7cc) / 10.5:1 Compression 650948 +.020“ oversize For Shovelhead Models from 7884 3.498“ Bore with 4.250“ Stroke/ 80“ (.656“ Dome w/ -47.4cc) / 8.6:1 Compression 650949 Standard 650951 +.020“ oversize 3.498“ Bore with 4.250“ Stroke/ 80“ ( .911“ Dome w/ -58cc) / 9.5:1 Compression 650954 +.010“ oversize 650955 +.020“ oversize 883cc to 1200cc Conversion Kits for Evolution Sportster Models from 86-20, except 08-10 XR 1200, 10-13 XR 1200X 3.498“ Bore with 3.812“ Stroke ( .099“ Dish w/ +13.7cc) with Coated Skirts / 9.5:1 Compression 650958 +.010“ oversize 650959 +.020“ oversize
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