I found a Sportster engine for sale. What are the first things I should check or replace?

When starting with a used engine of unknown history, it's wise to at least perform a top-end refresh. This typically includes new gaskets, checking cylinder and piston tolerances, and inspecting the valve train. This gives you peace of mind and a reliable starting point.

What are the easiest ways to get more power from my stock Sportster engine?

The most common and effective "Stage 1" upgrades are improving airflow. This means installing a high-flow air cleaner and a less restrictive exhaust system. These two changes allow the engine to breathe more freely and will deliver a noticeable performance gain without ever opening up the motor itself.

I'm rebuilding my engine. How important is it to replace all the hardware?

While not always strictly necessary, it's highly recommended. Engine hardware is subject to countless heat cycles and stress, which can cause it to stretch and weaken over time. Using new, high-quality head bolts, case bolts, and other hardware ensures proper torque specs and a leak-free, reliable engine for years to come.

Harley-Davidson 5 Motorcycle Engine

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Colony #2667-22-P Lower Motor Mount Allen Bolt Kit 1999-2003 Harley-Davidson Sportster - Chrome Plated
2 reviews $35.87

Colony #9926-17-P Upper and Lower Motor Mount Smooth Allen Kit 1970-1984 Harley-Davidson Shovelhead - Chrome Plated
3 reviews $43.45

Colony #9627-19 Upper & Lower Motor Mount Kit 1936-1969 Harley-Davidson Big Twin - Parkerized
3 reviews $52.45

Colony #2989-3 Crankcase Breather Stud Pipe Assembly 1948-1957 Harley-Davidson Panhead - Parkerized
3 reviews $36.00

Colony #8164-19 Upper And Lower Motor Mount Kit 1936-1969 Harley-Davidson Big Twin OHV - Chrome Plated
5 reviews $57.53

Colony #9798-20 Front Motor Mount Kit Stock 1957-1984 Harley-Davidson Sportster - Chrome Plated
2 reviews $47.38

Colony #7825-20 Grade 8 Head Bolt Kit 1948-Up Harley-Davidson Panhead/Shovelhead - CAD Plated
$43.99

Colony #9799-20 Front Motor Mount Kit Stock 1957-1984 Harley-Davidson Sportster - CAD Plated
13 reviews $40.61

Colony #2442-8 High Performance Cylinder Studs 1983-1999 Harley-Davidson Big Twin Evo
$120.18

Colony #2011-8 Head Bolt Set 12 Point 1985-1991 Harley-Davidson Big Twin 1986-1992 XL - Chrome Plated
2 reviews $109.99

Colony #2313-19 Upper and Lower Motor Mount Bolt Kit 1936-1969 Harley-Davidson Big Twin - Parkerized
1 review $52.45

Colony #2322-11 Rocker Arm Cover Stud Kit 1966-1984 Harley-Davidson Shovelhead
4 reviews $47.38

Colony #9641-16 Head Bolt Kit 1952-1953 Harley-Davidson K Model - CAD Plated
$85.45

Colony #8221-20 Head Bolt Kit 1948-Up Harley-Davidson Panhead/Shovelhead - Chrome Plated
8 reviews $76.76

Colony #8220-20 Head Bolt Kit 1940-1947 Harley-Davidson Knucklehead - Chrome Plated
$76.76

Colony #2306-16 Electrical Terminal Plate 1959-1969 Harley-Davidson Big Twin
$33.84

Colony #9772-22 Lower Motor Mount Allen Screw Kit 1986-1998 Harley-Davidson Sportster - Chrome Plated
1 review $33.84

Colony #8807-17 Motor Mounting Kit Upper & Lower 1970-1984 Harley-Davidson Big Twin - Zinc Plated
2 reviews $33.67

Colony #3310-17 Motor Case Kit 1932-1936 Harley-Davidson 45's - CAD Plated
$64.35

Colony #7629-14 High Crown Acorn Rocker Box Bolt Kit 1977-1985 Harley-Davidson Sportster - Chrome Plated
$62.27

Colony #8777-20-P Smooth Allen Head Bolt Kit 1948-Up Harley-Davidson Panhead/Shovelhead - Chrome Plated
$62.27

Colony #9797-20-P Front Motor Mount Smooth Allen Kit 1957-1985 Harley-Davidson Ironhead Sportster - Chrome Plated
2 reviews $60.83

Colony #2078-18 Lower Rocker Box Mounting Kit Harley-Davidson Evo Big Twin and Sportster
14 reviews $28.00

Colony #7518-4 Aluminum Alloy Tubular Pushrods 1936-1947 61c.i. Harley-Davidson Knucklehead
$55.00

Colony #7123-4 Aluminum Alloy Pushrod Kits - 1957-1985 Harley-Davidson Harley-Davidson Sportster
2 reviews $55.00

Colony #7824-12 Pushrod Covers 1940-1947 Harley-Davidson Knuckleheads - Chrome Plated
$54.67

Colony #2620-7 Frame Brace Upper Connection Kit 1937-1979 Harley-Davidson Sidecars - Parkerized
1 review $49.50

Colony #9927-28 Upper & Lower Motor Mounting Allen Kit 1984-1999 Harley-Davidson Softail - Chrome Plated
$49.25

Colony #9521-22 Upper & Lower Motor Mount Kit 1937-1947 Harley-Davidson Big Twin Side Valve - Chrome Plated
$47.80

Colony #3717-16 Black Headbolt Set 1973-1985 Harley-Davidson Sportster
$45.27

Colony #3678-16 Lower Motor Mount Kit 1936-1957 Harley-Davidson OHV Big Twins - Parkerized
$40.70

Colony #2946-1 Cylinder Bracket for Aluminum Heads 1936-1952 Harley-Davidson WL 45 1936-1973 Servi-car - CAD Plated
$37.00

Colony #2988-3 Crankcase Breather Stud and Pipe 1939-1947 Harley-Davidson Knuckleheads - Parkerized
$36.00

Colony #9772-22-P Lower Motor Mount Smooth Allen Kit 1986-1998 Harley-Davidson Sportster - Chrome Plated
1 review $35.87

Colony #9697-17 Motor Case Stock Fastener Kit 1940-1973 Harley-Davidson 45's - Parkerized
1 review $35.42

Colony #2305-12 Electrical Terminal Plate 1949-1957 Harley-Davidson Big Twin
3 reviews $33.84

Colony #2668-21 Lower Motor Mount Acorn Kit 1993-2003 Harley Sportster - Chrome Plated
1 review $33.67

Colony #7603-4 Lower Motor Mount Kit Acorn Nut 1936-1984 Harley-Davidson OHV Big Twins - Chrome Plated
6 reviews $31.87

Colony #3692-1 Valve Spring Lifter 1939-1948 Harley-Davidson UL/ULH Sidevalves
$30.80

Colony #9639-22 Electrical Terminal Plate 1970-1977 Harley-Davidson FL/FX - CAD Plated
$29.24

Colony #9832-28 Rocker Box Hex Screw Kit 1977-1985 Harley-Davidson Sportster - CAD Plated
$25.84

Colony #7110-8 Knuckle Nut Set With O-ring Seal - 1936-1947 Harley-Davidson Knucklehead - Chrome Plated
$47.80

Colony #2068-10 Allen Screw Motor Case Kit - 1977-1990 Harley-Davidson Sportster - Chrome Plated
$31.35

Colony #3470-28 Front Rocker Plate Stud Kit 1926-1929 Harley-Davidson Singles 45" 1930-1934 21 Singles JD - Nickel Plated
$81.40

Colony #3125-14-P Motor Mounting Kit 2017-Up Harley-Davidson Touring Models - Chrome Plated
$23.10

Colony #8619-17 Motor Case Kit 1940-1973 Harley-Davidson 45's - Chrome Plated
$37.95

Colony #7713-20 Head Bolt Set CAD Plated 1936-1939 Harley-Davidson Knucklehead - CAD Plated
$64.09

Colony #7709-32 Head Nut & Washer Kit 1942-Up Harley-Davidson 45's with Cast Iron Heads & 3/8-16 Head Studs
$40.56

Colony #9748-16 Head Bolt Allen Screw Kit 1973-1985 Harley-Davidson Sportster - Chrome Plated
$49.97

Colony #9643-16 Head Bolt Kit 1954-1956 Harley-Davidson KH Model - CAD Plated
$85.45

Colony #9642-16 Head Bolt Kit 1954-1956 Harley-Davidson KH Model - Chrome Plated
$107.17

Colony #8870-21 Lower Motor Mount Kit Acorn Head 1986-1992 Harley-Davidson Sportster - Chrome Plated
$33.67

Colony #9943-26 Rocker Box Mounting Acorn Kit 1999-up Harley-Davidson Twin Cam 88 Dyna/FLT 2000-Up Twin Cam 88B Softail- Chrome Plated
$37.66

Colony #9936-28 Front Motor Mount Kit Acorn 1991-Up Harley-Davidson Dyna - Chrome Plated
$36.20

Colony #9889-16 Head Bolt Kit 1951-1973 Harley-Davidson WL/G - CAD Plated
$87.26

Colony #9888-16 Head Bolt Kit 1951-1973 Harley-Davidson WL/G - Chrome Plated
$109.62

Colony #2168-22 Cam Cover Mounting Allen Screws 2002-Up Harley-Davidson VRSC - Chrome Plated
$25.72

Colony #2485-22 Motor Mounting Kit Upper and Lower Hex 2007-Up Harley-Davidson - Chrome Plated
$50.60

Colony #2451-17 Motor Case Kit 1952-1956 Harley-Davidson K Model - CAD Plated
$34.10

Colony #2403-22 Motor Mounting Kit Upper and Lower Allen 2007-Up Harley-Davidson - Chrome Plated
$50.60

Colony #2218-8 Motor Case Acorn Nut Mounting Kit 2004-Up Harley-Davidson Sportster - Chrome Plated
$32.12

Colony #9956-18 Motor Case Mounting Kit Allen 1999-Up Harley-Davidson Twin Cam/Dyna/FLT 2000-Up Softail - Chrome Plated
$20.85

Colony #9955-27 Motor Case Mounting Kit Acorn 1999-Up Harley-Davidson Twin Cam/Dyna/FLT 2000-Up Softail - Chrome Plated
$36.20

Colony #2403-22-P Upper and Lower Motor Mounting Kit Smooth Allen 2007-2008 Harley-Davidson FLT - Chrome Plated
$56.93

Colony #2947-1 Cylinder Bracket for Aluminum Heads 1936-1952 Harley-Davidson WL 45 1936-1973 Servi-car - Chrome Plated
$42.00

Colony #2709-24 Motor Mounting Kit Upper and Lower Allen 2009-Up Harley-Davidson FLT - Chrome Plated
$31.90

Colony #9927-28-P Upper and Lower Motor Mount Kit Smooth Allen 1984-1999 Harley-Davidson Softail - Chrome Plated
$53.58

Colony #9748-16-P Head Bolt Smooth Chrome Allen Bolt Kit Harley Sportster 1973-85
$52.87

Colony #9747-16-P Head Bolt Smooth Chrome Allen Kit Harley Sportster 1957-72
$49.25

Colony #8448-14 Rocker Box High Crown Chrome Cap Bolt Kit Harley Sportster 1957-76
$61.56

Colony #2709-24-P Upper and Lower Motor Mount Kit Smooth Allen 2009-Up Harley-Davidson FLT - Chrome Plated
$36.30

Colony #3029-12 Pushrod Covers 1940-1947 Harley-Davidson Knucklehead - CAD Plated
$54.67

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