ENGINE SECTION RED PART NUMBERS INDICATE NEW PARTS 6-61 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 Tappets PERFORMANCE TAPPET ASSEMBLIES FOR MOST MODELS PREMIUM TAPPET ASSEMBLY KIT FOR EVOLUTION MODELS PREMIUM TAPPETS FOR BIG TWIN & SPORTSTER • Superior quality USA made tappets in versions suited for your application. • Sold each. OEM Design: These lifters are manufactured to be direct replacements for the original equipment. They have same range of Leak Down as was supplied to your OE lifter. These lifters are made with the widest Leak Down range of 10 to 120 seconds. The reason for this range is to ease manufacturing and reduce the cost of the part. We manufacture this type of part to the same range as was supplied to the OEM. Slow Design These lifters have a Leak Down on the upper end of the scale from 90 to 120 seconds. In a performance application, these lifters will actually act like a mechanical lifter, with very little effective loss of valve lift or duration at any RPM. They also have a positive retainer instead of the OEM wire clip design. These lifters are very hard to produce, because the TOTAL clearance between the I.D. of the Body and Piston assembly is reduced to less than 0.000120”, or 1/30 of a human hair. These are like super heavy duty shocks and can handle higher spring pressures without collapsing like the OEM and Race lifters. Race Design These lifters have a Leak Down on the lower end of the scale, from 8 to 10 seconds. In the performance application, these lifters will actually “Bleed” down, and result in an effective loss of valve lift and duration at lower RPM’s. These are also referred to as “Variable Duration” Lifters, and will supply a better idle quality when using a performance cam, while still getting the benefit of the upper end power over a stock cam. As the engine increases in RPM, the Bleed down effect is reduced, resulting in more duration and valve lift.These lifters have a positive retainer instead of the OEM wire clip design. Some of our competitors just install a positive retainer in a standard OEM lifter and call it a Race or Variable Duration Lifter. Don’t be fooled, and make sure they are manufactured as Fast Leak lifters and not just a stock lifter with a nice retainer. Types of Hydraulic Lifters: Fitment O.D. Part # Big Twin Evo 1984/1999 & Sportster 1986/1990 STD 61973 Milwaukee-Eight® 2017/Later, Twin Cam 1999/2017 STD 61974 & Sportster 2000/Later Fitment O.D. Part # Big Twin Evo 1984/1999 & Sportster 1986/1990 STD 61976 Milwaukee-Eight® 2017/Later, Twin Cam 1999/2017 STD 61979 & Sportster 2000/Later Fitment O.D. Part # Big Twin Evo 1984/1999 & Sportster 1986/1990 .8425” STD 61975 Milwaukee-Eight® 2017/Later, Twin Cam 1999/2017 STD 61977 & Sportster 2000/Later RACE DESIGN SLOW DESIGN OEM DESIGN Fits Big Twin Evolution1984/1999 & Sportster 1986/1990 Fits Milwaukee-Eight® 2017/Later, Twin Cam 1999/2017, Sportster 2000/Later • S old in set of four. • P recision made and incorporates a big axle, roller and bearing design that increases durability. • Sold in set of four. • Rpls. HD 18538-99C. Part 61990 (Rpls. HD 18568-98) Part 61985
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