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 #2055-1 Head Bolt 1965-1973 Harley-Davidson 45's - Chrome Plated
$9.56

Colony #2019-8 Rocker Shaft End Plug 1957-1970 Harley-Davidson Big Twin - Chrome Plated
$43.45

Colony #2017-8 Head Bolt Washers 1984-Early 1985 Harley-Davidson Big Twin/XL - Chrome Plated
$34.76

Colony #2015-6 Oversize Valve Cover Screws 1948-1965 Harley-Davidson Panhead W/Steel D Rings - CAD Plated
$19.12

Colony #2010-10 Cylinder Head Bolt Washers 1940-1946 Harley-Davidson WLD - Parkerized
$7.26

Colony #2009-10 Cylinder Head Bolt Washers 1940-1946 Harley-Davidson WLD - CAD Plated
$7.26

Colony #2008-10 Cylinder Head Bolt Washers 1940-1946 Harley-Davidson WLD - Chrome Plated
$10.89

Colony #9806-8 Oil Pump Mounting Bolt Kit Acorn Nut 1977-1990 Harley-Davidson Sportster - Chrome Plated
$15.14

Colony #9805-10 Oil Pump Mounting Nut Allen Screw Kit 1954-1976 Harley-Davidson Sportster - Chrome Plated
$19.12

Colony #9846-4 Lifter Base Screw Kit 1957-1985 Harley-Davidson Sportster - CAD Plated
$5.58

Colony #9844-5 Chrome Countersink Washer Set for 7/16" Flat Head Socket Harley-Davidson - Chrome Plated
$19.93

Colony #9828-16 Lifter Base Screw Kit 1/4-20 Oval Allen Harley-Davidson After Market Cases- Chrome Plated
$17.92

Colony #9822-4 Oil Filter Adaptor Mounting Acorn Kit 1992-Up Harley-Davidson Big Twin - Chrome Plated
$7.96

Colony #9820-6 Timing Cover Acorn Screw Kit 1993-Up Harley-Davidson Big Twin - Chrome Plated
$23.54

Colony #9816-16 Lifter Base Screw Kit 1/4-20 Harley-Davidson Aftermarket Cases - Parkerized
$15.79

Colony #9780-5 Top Motor Mount Hardware Kit 1932-Up Harley-Davidson 45's - CAD Plated
$10.37

Colony #9775-8 Oil Pump Mounting Kit Acorn Nut 1991-Up Harley-Davidson Sportster - Chrome Plated
$15.14

Colony #9765-4 Lifter Base Acorn Screw Kit 1991-1994 Harley-Davidson Sportster - Chrome Plated
$15.14

Colony #9764-16 Oil Pump Mounting Kit Cap Style 1992-Up Harley-Davidson Big Twin - Chrome Plated
$28.97

Colony #9763-16 Oil Pump Mounting Kit Acorn 1992-Up Harley-Davidson Big Twin - Chrome Plated
$28.97

Colony #2542-10 Circuit Breaker to Coil Wire Assembly 1936-1948 Harley-Davidson Twins
$24.20

Colony #2539-1 Sprocket Shaft and Gear Shaft Nut 1930-1936 Harley-Davidson VL
$9.08

Colony #2486-1 Pike Nut Tappet Oil Screen Oil Pump Check Valve Plug 1981-Up Harley-Davidson Big Twins - Chrome Plated
$13.92

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

Colony #2454-36 Pushrod Cover Complete Kit Billet Alloy 1984-Up Harley-Davidson Big Twin Evo - Chrome Plated
$225.17

Colony #2453-12 Pushrod Cover Kit Billet Alloy 1984-Up Harley-Davidson Big Twin Evo - Chrome Plated
$177.10

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

Colony #2435-16 Head Bolt Set 1940-1951 Harley-Davidson WR/WLDR - Parkerized
$109.62

Colony #2411-2 Crank Pin Nut Set 1941-1953 Harley-Davidson 74" Big Twins
$29.00

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

Colony #2392-2 Front Axle Smooth Covers 2000-2007 Harley-Davidson Touring 2004-2007 Dyna - Chrome Plated
$31.63

Colony #2375-1 Pinion Gear Shaft Nut 1981-1989 Harley-Davidson Big Twins
$10.18

Colony #2344-10 Oil Pan Mounting Allen Screw Kit 2006-Up Harley-Davidson Dyna - Chrome Plated
$14.89

Colony #2225-8 Lifter Base Screw Acorn Screw Kit 2004-Up Harley-Davidson Sportster - Chrome Plated
$25.71

Colony #2224-8 Lifter Base Allen Screw Kit 2004-Up Harley-Davidson Sportster - Chrome Plated
$11.90

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

Colony #9968-12 Pushrod Covers 1999-Up Harley-Davidson Twin Cam- Chrome Plated
$66.63

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 #9953-10 Point Cover Mounting Acorn Nut Kit 199-Up Harley-Davidson Twin Cam Dyna/FLT 2000-Up Softail - Chrome Plated
$15.14

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

Colony #2224-8-P Lifter Base Smooth Allen Screw Kit 2004-Up Harley-Davidson Sportster - Chrome Plated
$17.88

Colony #2169-15-P Oil Pan Mounting Kit Smooth Allen 2002-Up Harley-Davidson VRSC - Chrome Plated
$26.40

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

Colony #2885-24 Valve Spring Cover Set Plated 1930-1936 Harley-Davidson VL - CAD Plated
$198.00

Colony #2854-6 Upper Engine Allen Mounting Kit 1984-1999 Harley-Davidson Softail - Chrome Plated
$13.92

Colony #2819-8 Horn Terminal Board Kit 1942-1946 Harley-Davidson All Models
$25.08

Colony #2814-18 Top of Tank Screw and Washer Kit 1918-1952 Harley-Davidson - Parkerized
$30.04

Colony #2811-13 Instrument Panel Light Switch Kit 1936-1945 Harley-Davidson Big Twin/45s - CAD Plated
$40.70

Colony #2792-3 Starter Crank Clamp Bolt 19441952 Harley-Davidson W Models - Parkerized
$8.47

Colony #2789-15 Horn Terminal Board Kit 1942-1952 Harley-Davidson WLA/WLC/XA
$23.76

Colony #2788-16 Motor Case Kit 1929-1939 Harley-Davidson 45s
$56.10

Colony #2768-10 Front Safety Guard Mounting Kit 1932-1973 Harley-Davidson 45s - Chrome Plated
$29.78

Colony #2740-2 Left Bearing End Oil Slinger 1939-1973 Harley-Davidson 45s
$16.94

Colony #2731-2 Seat Bar Clevis Pin Kit 1912-1933 Harley-Davidson - Parkerized
$6.05

Colony #2726-2 Pike Nut Spike Rear Axle Covers 2008-2012 Harley-Davidson Sportster - Chrome Plated
$54.14

Colony #2710-1 Oversized Linkert Carburetor Venturi 1-1/8 inch OEM# 27363-40
$41.97

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

Colony #2689-10 Oil Pan Mounting Kit Acrons 2006-Up Harley-Davidson Dyna - Chrome Plated
$33.00

Colony #2649-9 Top Motor Mount Hardware Kit 1936-1947 Harley-Davidson Big Twin - Parkerized
$15.13

Colony #2648-9 Top Motor Mount Hardware Kit 1936-1947 Harley-Davidson Big Twin - CAD Plated
$15.13

Colony #2572-1 Sprocket and Pinion Shaft Nut 1981-1985 Harley-Davidson Sportster
$9.90

Colony #2571-2 Crank Pin Nut Set 1983-1999 Harley-Davidson Big Twins
$26.50

Colony #3035-5 Top Motor Mount Hardware 1932-Up Harley-Davidson 45s - Parkerized
$10.37

Colony #9939-6-P Oil Filter Adaptor Mounting Kit Smooth Chrome Allen Harley 99-up Twin Cam Dyna FLT
$6.38

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

Colony #9774-8-P Oil Pump Mounting Kit Smooth Chrome Allen Harley Sportster 1991-up
$9.68

Colony #9760-4-P Lifter Base Smooth Chrome Allen Bolt Kit Harley Sportster 1995-03
$8.78

Colony #9759-4-P Lifter Base Smooth Chrome Allen Screw Kit Harley Sportster 1991-94
$9.56

Colony #9752-4-P Oil Filter Adaptor Smooth Chrome Screw Kit Harley XL 1986-1990
$7.96

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

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