ENGINE SECTION RED PART NUMBERS INDICATE NEW PARTS 6-43 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 Pistons Standard Bore & Stroke Piston Sets PERFORMANCE PISTON SETS FOR BIG TWIN 120 CUBIC INCH SUPER DUTY PISTONS FOR MILWAUKEE-EIGHT® • Spawned from this successful manufacturer’s line of automotive pistons. • Lightweight permanent mold cast pistons. • Manufactured from Hypereutectic 390 Alloy, contain 16-18% silicon, and heat treated to T6 specifications, producing a stronger than stock piston. • Special alloy composition keeps heat confined to the combustion chamber and reduces heat transfer to the piston itself, producing a cooler running piston. • Can be fitted with a clearance as small as .00075”. • Piston expansion is reduced by as much as 20% over conventional pistons. • Less piston rock, better ring support, more durability and better retained compression for maximum power. • The key feature to these pistons is the accumulator groove between the top and second ring, which averages the normal pressure between the first and second ring, keeping the pressure low enough to prevent lifting of the top ring, while maintaining preload on the second (oil scraping) ring. • Each set of pistons includes wrist pins, spiral locks, engine assembly lube, and Hastings Moly rings. • Wrist pins measure .792” O.D. on single cam models and .927” O.D. on Twin Cam models. • Sold in sets as shown. • See page 6-49 for replacement ring sets for Keith Black pistons. New 120” MB Super Duty Forged Pistons fit 2017/Later Harley-Davidson® 114” & 117” Milwaukee-Eight® motors using stock cylinders bored to 4.125”, 11:1 compression with generous valve pockets to accept 1mm larger valves. Features: • Hard anodized crown aids in heat deflection and corrosion from alcohol fuels. • Round wire locks. • Premium Hastings 1.2mm, 1.2mm & 3.0mm rings. • M8 Series feature Line2Line Abradable Coating standard. Line2Line is applied the thickness of the piston-to-wall clearance for a ZERO install clearance. The coating abrades in on start-up to hone for the perfect fit per cylinder, and eliminates piston rock for the best possible ring seal with no piston slap noise. Fits Description Bore Part # Panhead, Shovelhead 88ci - 98ci - 3.625” STD Bore 62423 8.5:1 Dome Top Piston +.010” 62425 (4.25” - 4.75” Stroke) +.020” 62426 +.030” 62427 +.040” 62428 Fits Description Bore Part # Knucklehead, 74ci - 1200cc - 3.438” STD Bore 62264 Panhead & 9:1 Dome Top Piston +.010” 62265 Shovelhead +.020” 62266 +.030” 62267 +.040” 62268 +.050” 62269 +.060” 62270 +.070” 62271 Shovelhead 80ci - 1340cc - 3.498” STD Bore 62296 7.2:1 Dome Top Piston +.005” 62297 +.010” 62298 +.020” 62299 +.030” 62400 +.040” 62401 Big Twin Evolution 80ci - 1340cc - 3.498” STD Bore 62278 8.6:1 Flat Top Piston +.005” 62279 +.010” 62280 +.020” 62281 +.030” 62282 80ci - 1340cc - 3.498” STD Bore 62186 9.6:1 Dome Top Piston +.005” 62187 +.010” 62188 +.020” 62189 +.030” 62190 80ci - 1340cc - 3.498” STD Bore 62284 10.5:1 Dome Top Piston +.005” 62285 +.010” 62286 +.020” 62287 +.030” 62288 Twin Cam 95ci - 3.875” STD Bore 62480 88” to Big Bore 95” 9.3:1 Flat Top Piston +.010” 62481 (4.0” Stroke) +.020” 62482 Big Bore & Stroker Piston Sets Description Bore Part # 120ci Heavy Duty Piston Kits 4.125” 62194 for Milwaukee-Eight® 4.135” 62195 4.145” 62196 REPLACEMENT PARTS Description Part # Piston Pin Circlip for Keith Black 65198 Twin Cam pistons only Piston Pin Circlip for all Keith 65199 Black pistons (except Twin Cam)
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