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 #9937-20 Front Motor Mount Allen Kit 1991-Up Harley-Davidson Dyna - Chrome Plated
1 review $18.34

Colony #2169-15 Oil Pan Mounting Allen Screw Kit 2002-Up Harley-Davidson VRSC - Chrome Plated
$17.88

Colony #2061-8 Cam Cover Phillips Screw Kit 1971-1980 Harley-Davidson Sportster - Chrome Plated
$16.94

Colony #9973-4 1/2 inch Countersunk Washers - 4 pack - Chrome Plated
$15.94

Colony #2075-8 Allen Motor Case Bolt Kit 1991-2003 Harley-Davidson Sportster - Chrome Plated
$16.38

Colony #9984-24 Valve Cover Washers 1954-1965 Harley-Davidson Panhead - Chrome Plated
$15.52

Colony #2100-16 Lifter Base Phillips Screw Kit 1950-1953 Harley-Davidson Big Twin 1952-1956 K Models - CAD Plated
$18.52

Colony #9946-20 Cam Cover Mounting Allen Kit 1999-Up Twin Cam Dyna/FLT 2000-Up Softail - Chrome Plated
1 review $14.89

Colony #9874-2 Oil Screen Plug 1966-1969 Harley-Davidson Big Twins - Chrome Plated
$14.34

Colony #9967-4 Top Motor Mount to Cylinder Head Hardware 1993-Up Harley-Davidson Big Twin 1986-Up XL - Zinc Plated
$12.74

Colony #2170-9 Water Pump Cover Thermostat Allen Hardware Kit 2002-Up Harley-Davidson VRSC - Chrome Plated
$12.67

Colony #9876-2 Oil Screen Plug 1970-1980 Harley-Davidson Big Twins - Chrome Plated
$11.96

Colony #9985-24 Valve Cover Washers 1954-1965 Harley-Davidson Panhead - CAD Plated
$11.56

Colony #2167-2 Upper Crankcase Plug Gasket Kit 2002-Up Harley-Davidson VRSC - Chrome Plated
1 review $10.42

Colony #9877-2 Oil Screen Plug 1970-1980 Harley-Davidson Big Twins - CAD Plated
$7.96

Colony #9954-5 Point Cover Mounting Button Torx Kit 1999-Up Harley-Davidson Twin Cam Dyna/FLT 2000-Up Softail - Chrome Plated
2 reviews $7.17

Colony #9939-6 Oil Filter Adapter Mounting Allen Kit 1999-Up Harley-Davidson Twin Cam Dyna/FLT - Chrome Plated
$4.76

Colony #9808-6 Oil Nipple Cap 1915-1964 Harley-Davidson All Models - CAD Plated
1 review $14.85

Colony #9640-16 Head Bolt Kit 1952-1953 Harley-Davidson K Model - Chrome Plated
$107.17

Colony #9728-36 Head Bolt Set 1940-Up Harley-Davidson Flathead 45 1930-1947 74/80 Iron Head - Parkerized
4 reviews $97.04

Colony #9727-18 Head Bolt Set 1940-1947 Harley-Davidson 74/80 Alloy Head - Parkerized
3 reviews $98.48

Colony #9726-20 Head Bolt Set 1940-1947 Harley-Davidson Knucklehead - Parkerized
3 reviews $64.09

Colony #9725-20 Head Bolt Set 1936-1939 Harley-Davidson Knucklehead - Parkerized
2 reviews $64.09

Colony #9202-12 Pushrod Covers 1984-Up Harley-Davidson Big Twin Evo 1986-1990 XL - Chrome Plated
1 review $66.63

Colony #9797-20 Front Motor Mount Kit Allen Head 1957-1985 Harley-Davidson Sportster - Chrome Plated
$59.38

Colony #9865-20 Upper Pushrod Cover Kit Harley-Davidson Big Twin Evo W/S&S Lifter Blocks - Chrome Plated
$50.08

Colony #9854-28 Upper & Lower Motor Mount Kit 1984-1999 Harley-Davidson Softail - Chrome Plated
2 reviews $49.25

Colony #9110-9 Head Bolt Covers Acorn Head 1973-1984 Harley-Davidson XL - Chrome Plated
$49.97

Colony #9211-16 Head Bolt Set 12 Point 1973-1985 Harley-Davidson Sportster - Chrome Plated
2 reviews $56.49

Colony #9212-16 Head Bolt Set 12 Point 1973-1985 Harley-Davidson Sportster - CAD Plated
$45.27

Colony #9747-16 Head Bolt Allen Screw Kit 1957-1972 Harley-Davidson Sportster - Chrome Plated
$46.35

Colony #9859-20 Lower Motor Mount Kit 1988-2006 Harley-Davidson FLT/FLHT/FXR/FXRS - Chrome Plated
$44.89

Colony #9522-22 Upper & Lower Motor Mount Kit 1937-1947 Harley-Davidson Big Twin Side Valve - CAD Plated
$43.82

Colony #9855-28 Upper & Lower Motor Mount Kit 1984-1999 Harley-Davidson Softail - Zinc Plated
$42.00

Colony #9625-16 Lower Motor Mount Kit 1930-1936 Harley-Davidson VL All 45 's - Chrome Plated
$38.73

Colony #9847-9 Banjo Style Oil Feed Line Fitting Kit 1936-1941 Harley-Davidson Knucklehead - Chrome Plated
$37.66

Colony #9407-1 11/16"-16 Thread Repair Tap Harley-Davidson All Split Cases
$37.66

Colony #9860-20 Lower Motor Mount Kit 1988-2006 Harley-Davidson FLT/FLHT/FXR/FXRS
$36.94

Colony #9698-18 Head Bolt Washer Kit 1940-1947 Harley-Davidson 45/74/80 Alloy Head - Parkerized
$33.31

Colony #9626-16 Lower Motor Mount Kit 1930-1936 Harley-Davidson VL All 45 's - Parkerized
$32.95

Colony #9831-28 Rocker Box Screw Hex Head Kit 1977-1985 Harley-Davidson Sportster - Chrome Plated
1 review $31.14

Colony #9829-28 Rocker Box Screw Kit 1957-1976 Harley-Davidson Sportster - Chrome Plated
$31.14

Colony #9848-9 Banjo Style Oil Feed Line Fitting 1936-1941 Harley-Davidson Knucklehead - CAD Plated
$29.70

Colony #9694-19 Oil Pump Mounting Kit 1936-1967 Harley-Davidson OHV Big Twin - Parkerized
2 reviews $27.50

Colony #9830-28 Rocker Box Screw Kit 1957-1976 Harley-Davidson Sportster - CAD Plated
$25.84

Colony #9827-12 Timing Cover Allen Screw Kit 1/4-20 1936-1970 Harley-Davidson After Market Cases - Chrome Plated
1 review $24.62

Colony #9794-12 Timing Cover Screw Kit 1/4-20 After Market Harley-Davidson Cases - Chrome Plated
$24.20

Colony #9416-4 Spring Retainer & Hex Nut Set 1930-1935 Harley-Davidson VL/RL - Chrome Plated
$21.52

Colony #9699-12 Rocker Box Mounting Kit 1936-1947 Harley-Davidson Knucklehead - Parkerized
$19.51

Colony #9417-4 Spring Retainer & Hex Nut Set 1930-1935 Harley-Davidson VL/RL - Parkerized
$19.93

Colony #9796-12 Timing Cover Screw Kit 1/4-20 After Market Harley-Davidson Cases - Parkerized
$21.30

Colony #9836-5 Chrome Countersink Washer Set for 3/8" Flat Head Socket Harley-Davidson - Chrome Plated
1 review $16.73

Colony #9101-8 Cylinder Base Nut Set Zinc 1978-1984 Harley-Davidson Shovelhead OEM# 16838-78 - Zinc Plated
1 review $20.35

Colony #9773-8 Center Motor Mount Kit Acorn Nut 1986-2003 Harley-Davidson Sportster - Chrome Plated
$16.73

Colony #9762-16 Oil Pump Mounting Kit Allen 1992-Up Harley-Davidson Big Twin - Chrome Plated
1 review $16.38

Colony #9834-8 Chrome Countersink Washer Set for 1/4" Flat Head Socket Harley-Davidson - Chrome Plated
$15.14

Colony #9607-2 Oil Pump Relief Valve Plug 1968-1980 Harley-Davidson Big Twin - Chrome Plated
$15.14

Colony #9814-16 Lifter Base Screw Kit 1/4-20 Harley-Davidson Aftermarket Case - Chrome Plated
1 review $17.69

Colony #9766-4 Lifter Base Acorn Screw Kit 1995-Up Harley-Davidson Sportster - Chrome Plated
$14.34

Colony #9721-2 Cylinder Head Bolt Spacers 1937-1973 Harley-Davidson 45's - Parkerized
$13.94

Colony #9779-5 Top Motor Mount Hardware Kit 1932-Up Harley-Davidson 45's - Chrome Plated
$13.55

Colony #9523-1 Oil Pump Check Valve Plug 1936-1980 Harley-Davidson Big Twin 1937-Up UL/45s - Chrome Plated
2 reviews $12.74

Colony #9526-1 Oil Pump Bypass Valve Plug 1936-1952 Harley-Davidson Big Twin 1937-Up UL/45s - Chrome Plated
$11.96

Colony #9305-7 Timing Cover Screw Kit 1970-1980 Harley-Davidson Shovelhead - Chrome Plated
1 review $12.10

Colony #9819-12 Timing Cover Allen Screw Kit 1993-Up Harley-Davidson Big Twin - Chrome Plated
1 review $11.90

Colony #9608-2 Oil Pump Relief Valve Plug 1968-1980 Harley-Davidson Big Twins - CAD Plated
2 reviews $11.14

Colony #9103-4 Shift Rod End Bolt Kit 1936-1954 Harley-Davidson Handshift 1951-1964 Foot Shift - Chrome Plated
$11.56

Colony #9606-2 Oil Pump Relief Valve Plug 1954-1967 Harley-Davidson Big Twin - CAD Plated
$11.14

Colony #9604-2 Oil Screen Plug 1952-1965 Harley-Davidson Big Twin - CAD Plated
$11.14

Colony #9781-5 Top Motor Mount Hardware Kit 1932-Up Harley-Davidson 45's - Parkerized
1 review $10.37

Colony #9527-1 Oil Pump Bypass Valve Plug 1936-1952 Harley-Davidson Big Twin 1937-Up UL/45s - CAD Plated
$9.56

Colony #9787-12 Oil Pump Mounting Kit Stock 1978-1991 Harley-Davidson Big Twins - Zinc Plated
$8.78

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