07-102 HELMETS & AUDIO PRIMARY & CLUTCH CONTROL CABLES & HYDRAULIC LINES OIL, OIL FILTERS & OIL COOLERS SEAT TRANSMISSION FOOT CONTROLS HARDWARE EXHAUST GASKET & SEALS FRONT FORKS WINDSHIELD ELECTRIC & LIGHT FINAL DRIVE FRAME & REAR SUSPENSION LUGGAGE ENGINE ELECTRICS WHEELS & TIRES FENDER & STRUTS TOOLS & CHEMICALS INTAKE BRAKE GAS & OIL TANK TECH TIPS & CROSS REF OEM>ZPN ENGINE HANDLEBAR, HAND CONTROLS & MIRRORS GAUGES & DASHES ALPHABETICAL INDEX 3 5/8" Big Bore in 1948-1984 Big Twins, cleared for both 4 1/4" and 4 3/4" stroke Piston kit Replacement 10: 1 compression Ring Set Bore 724271 049017 3.625" Std 724272 049018 +.005" 724273 049018 +.010" 724274 049019 +.020" 724275 049023 +.030" 724276 049024 +.040" Evolution Sportster 1200 1988 to present Piston kit with coated skirts Replacement 9: 1 compression Ring Set Bore 724233 231250 3.498" Std. 724234 231254 +.005" 724235 231251 +.010" 724236 231252 +.020" 724237 231253 +.030" 724238 744021 +.040" Evolution Big Twin 1984-1999 Piston kit Piston kit Replacement 8.5: 1 compression 10.5: 1 compression Ring Set Bore 724289 724295 231210 3.498" Std. 724290 724296 231211 +.005" 724291 724297 231211 +.010" 724292 724298 231212 +.020" 724293 724299 231213 +.030" 724294 724300 231214 +.040" Big Bore conversion kit Evolution Sportster 883 to 1200 Piston kit with coated skirts Piston kit with coated skirts Replacement 9: 1 compression 11.0: 1 compression Ring Set Bore 724227 724233 231250 3.498" Std. 724228 724234 231254 +.005" 724229 724235 231251 +.010" 724230 724236 231252 +.020" 724231 724237 231253 +.030" 724232 724238 744021 +.040" Note: 2009 to present 883 cylinders can not be bored to this size, you must order a pair of XL 1200 cylinders 3.875" Big Bore kits for Twin Cam models 1999-2006, give 95 Cubic Inches with stock 4" stroke Piston kit with coated skirts Replacement 10: 1 compression Ring Set Bore 724302 744010 3.875" Std. 724303 744012 +.010" 724304 744013 +.020" 724305 744014 +.030" 724306 744015 +.040" 3.875" Big Bore kits for 2007-2017 Twin Cam, give 103 Cubic Inches with stock 4 3/8" stroke Piston kit with coated skirts Replacement 10: 1 compression Ring Set Bore 724307 744010 3.875" Std. 724308 744011 +.005" 724309 744012 +.010" 724310 744013 +.020" 724311 744014 +.030" 724312 744015 +.040" 1941-1979 1200cc (74CI) Big Twin Piston kit Piston kit Replacement 8.5: 1 compression 9.0: 1 compression Ring Set Bore 724239 724249 231200 3.437" Std. 724240 724250 231201 +.005" 724241 724251 231202 +.010" 724242 724252 231203 +.020" 724243 724253 231204 +.030" 724244 724254 231205 +.040" 724245 724255 231206 +.050" 724246 724256 231210 +.060" 724247 724257 231211 +.070" 724248 724258 231212 +.080" 1980-1984 1340cc (80CI) Big Twin Maximum oversize in OEM 1340 CC/80 CI cylinders is +.0.20". Oversizes .030" and .040" can be used in aftermarket cylinders ONLY. Check wall thickness before ordering. Piston kit Piston kit Replacement 8.6: 1 compression 9.5: 1 compression Ring Set Bore 724259 724265 231210 3.498" Std. 724260 724266 231211 +.005" 724261 724267 231211 +.010" 724262 724268 231212 +.020" 724263 724269 231213 +.030" 724264 724270 231214 +.040" 3 5/8" Big Bore in 1948-1984 Big Twins with stock 5.330" length cylinders and 4 1/2" stroke Piston kit with coated skirts Piston kit with coated skirts Replacement 9.0: 1 compression 10.2: 1 compression Ring Set Bore 724277 724283 049017 3.625" Std. 724278 724284 049018 +.005" 724279 724285 049018 +.010" 724280 724286 049019 +.020" 724281 724287 049023 +.030" 724282 724288 049024 +.040" These pistons are made from forged 4032 alloy that has an 11% silicon content. Pistons are formed in a forging press an then fully machined. the combination of this alloy and forging process allows the piston to flex under detonation or pre-ignition, giving the best resistance to cracking. Since 4032 alloy has a low expansion rate but higher than the Keith Black Hypereutectic pistons, it will require a .001" wider piston to wall clearance. Keith Black forged alloy pistons are suited for High Performance street and race applications including high compression and NOS equipped bikes. All pistons come with a set of Hastings piston rings, piston pins and spiral piston lock rings. Where indicated pistons come with an Anti-Friction skirt coating. 2207 KEITH BLACK FORGED ALLOY PISTONS (Ȧ*ȡ1ȝ PISTONS & PISTON RINGS (Site 512)
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