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 Motorcycle Engine

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Colony #8123-34 Motor Case Kit Stock 1936-1939 Harley-Davidson Flathead - CAD Plated
$51.70

Colony #8122-34 Motor Case Kit Stock 1936-1939 Harley-Davidson Flathead - Chrome Plated
$58.30

Colony #8121-34 Motor Case Kit Acorn Head 1936-1939 Harley-Davidson Flathead - Chrome Plated
$63.61

Colony #8171-8 Cylinder Base Nut Lockwashers OEM 7055 All 1930-1977 Harley-Davidson Big Twins - CAD Plated
$4.76

Colony #8116-1 Motor Case Drain Plug/Oil Pump Body Plug 1911-1970 Harley-Davidson Big Twin Cases/1968-1984 Oil Pump Body - Chrome Plated
$6.60

Colony #8108-1 Long Oil Pump Nut Pre-1967 Harley-Davidson Big Twins - Chrome Plated
$7.17

Colony #8103-16 Lifter Base Screw Kit 1936-1953 Harley-Davidson Big Twin & 1937-1973 45's - CAD Plated
$16.35

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

Colony #7712-36 Head Bolt Set 1940-Up Harley-Davidson 45's 1930-1947 Flathead 74's/80's with Iron Heads - CAD Plated
$97.04

Colony #7711-18 Head Bolt Set CAD Plated 1940-1947 Harley-Davidson Flathead 74's/80's with Aluminum Heads - CAD Plated
$98.48

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 #7628-8 Lifer Base Screw Kit 1976-Up Harley-Davidson 74's - Chrome Plated
$25.71

Colony #7623-8 Hi-Torq Cylinder Base Nut Set - Chrome Plated
$32.48

Colony #7509-20 Upper Pushrod Cover Kit 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$50.08

Colony #7412-24 Acorn Rocker Arm Cover Screw Kit All Harley-Davidson Panheads- Chrome Plated
$60.91

Colony #7402-7 Acorn Head Timing Cover Screw Kit 1970-1992 Harley-Davidson Big Twins - Chrome Plated
$24.26

Colony #7352-16 Heat Treated Acorn Head Bolt Kit Late 1973-1985 Harley-Davidson Sportster - Chrome Plated
$57.94

Colony #7152-20 Heat Treated Acorn Head Bolt Kit - 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$66.63

Colony #7151-16 Heat Treated Acorn Head Bolt Kit - 1957-Early 1973 Harley-Davidson Sportster - Chrome Plated
$57.94

Colony #7150-8 Acorn Head Cam Cover Screw Kit - 1971-1985 Harley-Davidson Sportster - Chrome Plated
$29.70

Colony #7131-8 Lifter Base Acorn Screw Kit - 1936-1975 OHV Harley-Davidson Davidson Big Twin - Chrome Plated
$25.71

Colony #7130-10 Circuit Breaker & Relay Screw Kit - 1936-1957 Harley-Davidson Big Twins - Chrome Plated
$17.22

Colony #7120-4 Aluminum Valve Retainers - All Harley-Davidson Davidson OHV 74's
$35.13

Colony #7115-2 Acorn Head Countershaft Sprocket Cover Screw Set - 1957-1969 Harley-Davidson Sportster 1952-56 K Model - Chrome Plated
$14.74

Colony #8306 PARK Complete Stock Hardware Kit - 1940-1948 Harley-Davidson 74 & 80 Aluminum Head - CAD Plated
$339.82

Colony #8304 CHR Complete Stock Hardware Kit - 1937-1939 Harley-Davidson 74 & 80 Cast Iron Head - Chrome Plated
$389.63

Colony #8313 CAD Complete Stock Hardware Kit - 1979-1980 Harley-Davidson Shovelhead - CAD Plated
$266.32

Colony #8307 CHR Complete Stock Hardware Kit - 1966-1969 Harley-Davidson Shovelhead - Chrome Plated
$387.28

Colony #9774-8 Oil Pump Mounting Allen Screw Kit 1991-2003 Harley-Davidson Sportster - Chrome Plated
$8.20

Colony #9759-4 Lifter Base Allen Screw Kit 1991-1994 Harley-Davidson Sportster - Chrome Plated
$9.16

Colony #9754-1 Kicker Starter Spring Stud 1941-1963 Harley-Davidson 45's - Chrome Plated
$9.56

Colony #9752-4 Oil Filter Adaptor Allen Screw Kit 1986-1990 Harley-Davidson XL - Chrome Plated
$4.76

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

Colony #9738-1 Rocker Feedline Nipple 1936-1941 Harley-Davidson OHV - Chrome Plated
$10.37

Colony #9715-8 Cylinder Base Nut Lockwashers 1930-1977 Harley-Davidson Big Twin - Chrome Plated
$6.14

Colony #9710-3 Oval Head Screw Kit 5/16"-24 Harley-Davidson - Parkerized
$8.78

Colony #9701-1 Rocker Feedline Nipple 1936-1941 Harley-Davidson OHV 1937-1952 45's - Parkerized
$8.78

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 #9616-4 Rear Stand Mounting Kit 1938-1957 Harley-Davidson Big Twins 1939-Up 45s - Chrome Plated
$22.80

Colony #9614-10 Oil Pump Mounting Kit Late 1971-1976 Harley-Davidson Sportster - Chrome Plated
$9.56

Colony #9408-22 Oil Pump Mounting Kit 1937-1973 Harley-Davidson 45's - Chrome Plated
$44.00

Colony #9112-9 Head Bolt Covers Cap Head 1973-1984 Harley-Davidson XL - Chrome Plated
$49.97

Colony #9019-2 Rocker Stud Nut Lock 1940-1952 Harley-Davidson 45 Solo OEM# 45681-40 - Parkerized
$5.96

Colony #8940-2 Swingarm Pivot Bolt Cover Red Reflectors 1986-1999 Harley-Davidson FXST/FLSH - Chrome Plated
$24.62

Colony #8939-2 Swingarm Pivot Bolt Cover Amber Reflectors 1986-1999 Harley-Davidson FXST/FLSH - Chrome Plated
$24.62

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

Colony #8867-4 Lifter Base Screw Kit Acorn Head 1986-1990 Harley-Davidson Sportster - Chrome Plated
$14.74

Colony #8864-4 Oil Filter Adaptor Screw Kit Allen Head 1986-Up Harley-Davidson Sportster - Chrome Plated
$10.76

Colony #8743-14 Oil Pump Mounting Kit 1967-1977 Harley-Davidson Big Twin - CAD Plated
$20.31

Colony #8721-1 Oil Pump Mounting Nut 1941-1948 Harley-Davidson 74/80 1941-1954 45s - CAD Plated
$5.58

Colony #8719-1 Oil Pump Mounting Nut 1941-1948 Harley-Davidson 74/80 1941-1954 45s - Chrome Plated
$6.78

Colony #2253-36 Adjustable Pushrod Cover Kit 2004-Up Harley-Davidson Sportster
$140.00

Colony #9950-6 Oil Hose Cover Mounting Allen Kit 1999-Up Harley-Davidson Twin Cam Dyna/FLT - Chrome Plated
$4.38

Colony #9949-6 Oil Hose Cover Mounting Acorn Kit 1999-Up Harley-Davidson Twin Cam Dyna/FLT - Chrome Plated
$9.96

Colony #9948-8 Electrical Panel Cover Mounting Allen Kit 1991-Up Harley-Davidson Dyna - Chrome Plated
$5.95

Colony #9947-8 Electrical Panel Cover Mounting Acorn Kit 1991-Up Harley-Davidson Dyna - Chrome Plated
$11.96

Colony #9945-20 Cam Cover Mounting Acorn Kit 1999-up Harley-Davidson Twin Cam 88 Dyna/FLT 2000-Up Twin Cam 88B Softail - Chrome Plated
$30.42

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 #9941-24 Lifter Base Mounting Acorn Kit 1999-Up Harley-Davidson Twin Cam 88 Dyna/FLT 2000-Up Twin Cam 88B Softail - Chrome Plated
$21.35

Colony #9938-6 Oil Filter Adapter Mounting Acorn Kit 1999-Up Harley-Davidson Twin Cam Dyna/FLT - Chrome Plated
$8.36

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 #9882-22 Motor Case Hardware Kit Acorn 1996-Up Harley-Davidson Big Twin Evo - Chrome Plated
$54.32

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

Colony #2148-8 Pushrod Cover Kit for Harley-Davidson Twin Cam Motors - Chrome Plated
$77.15

Colony #2118-15 Lower Front Hex Head Motor Mount Kit 2000-Up Harley-Davidson Softail - Zinc Plated
$44.67

Colony #2102-12 Timing Cover Phillips Screw Kit 1950-1952 Harley-Davidson Big Twin - CAD Plated
$21.78

Colony #2099-16 Lifter Base Phillips Screw Kit 1950-1953 Harley-Davidson Big Twin 1952-1956 K Models - Chrome Plated
$20.33

Colony #2073-2 Tappet Oil Screen/Pump Check Valve/Relief Valve 1981-Up Harley-Davidson Big Twin - Chrome Plated
$12.34

Colony #2056-1 Head Bolt 1965-1973 Harley-Davidson 45's - CAD Plated
$8.36

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