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 CAD Plated Motorcycle Engine

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Colony #8138-34 Motor Case Kit Stock 1965-1969 Harley-Davidson Big Twin - CAD Plated
$51.70

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

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

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

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

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

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

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

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

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

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

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

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

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

Colony #2911-2 Crank Pin Nut Set 1915-1936 Harley-Davidson All Twins - CAD Plated
$23.75

Colony #2223-11 Cam Cover Acorn Screw Kit 2004-Up Harley-Davidson Sportster - CAD Plated
$35.70

Colony #2168-22-P Cam Cover Mounting Kit Smooth Allen 2002-Up Harley-Davidson VRSC - CAD Plated
$39.25

Colony #3272-1 Relief Pipe Nut 1926-1931 Harley-Davidson Singles 1929-1931 45 Twins - CAD Plated
$10.89

Colony #3285-18 Head Bolt Aluminum Washer Set Harley-Davidson Flathead (Aluminum Head) OEM# 16822-39 - CAD Plated
$44.00

Colony #3190-4 Rocker Arm Shaft Nut Set 1936-1947 Harley-Davidson Knuckleheads - CAD Plated
$65.99

Colony #3024-34 Rocker Arm Cover Screw Kit 1939-1947 Harley-Davidson Knucklehead - CAD Plated
$14.81

Colony #3730-2 Crankcase Bolt Set 1930-1978 Harley-Davidson Big Twins - CAD Plated
$14.30

Colony #3401-16 Rocker Cover Allen Screw Kit 1985-Up Harley-Davidson FL/FX 1986-Up XL - CAD Plated
$13.55

Colony #3395-8 Oil Pump Mounting Kit 1991-2003 Harley-Davidson Sportster - CAD Plated
$5.32

Colony #3394-10 Oil Pump Mounting Kit 1977-1990 Harley-Davidson Sportster - CAD Plated
$6.29

Colony #3648-16 Headbolt Set 1957-1972 Harley-Davidson Sportster - CAD Plated
$51.78

Colony #3209-4 Lifter Base Screw Kit 1957-1985 Harley-Davidson Sportster - CAD Plated
$10.65

Colony #3680-16 Lower Motor Mount Kit 1936-1957 Harley-Davidson OHV Big Twins - CAD Plated
$40.70

Colony #3520-9 Crankcase Relief Pipe Gasket Kit 1937-1973 Harley-Davidson 45s 1937-1948 Sidevalve Models - CAD Plated
$4.79

Colony #3516-4 Cylinder Head Spacer 1954-1956 Harley-Davidson KH/KHK/KHR/KHRM - CAD Plated
1 review $30.80

Colony #3515-4 Cylinder Head Spacer 1952-1953 Harley-Davidson K/KK/KRM 1952-1969 KR - CAD Plated
$35.20

Colony #3421-1 Oversized Motor Case Drain Plug 1936-1970 Harley-Davidson Big Twin Cases 1937-Up 45 Cases 1968-1984 Oil Pump Body - CAD Plated
$5.50

Colony #3420-1 Upper Head Cone 1930-1939 Harley-Davidson 1930-34 C Singles - CAD Plated
$33.00

Colony #3385-1 Head Cone Locknut 1930-1938 Harley-Davidson 1930-1934 C Singles - CAD Plated
$22.00

Colony #3407-14 Timing Cover Screw Kit 1930-1936 Harley-Davidson VL - CAD Plated
$20.63

Colony #3353-4 Oil Line Nut & Sleeve Rubber 1949-1964 Harley-Davidson Big Twins 1954-1966 KH/XL - CAD Plated
1 review $12.10

Colony #3246-1 Oil Pressure Switch Nipple 1958-1969 Harley-Davidson Big Twins - CAD Plated
1 review $8.47

Colony #3208-28 Rocker Box Screw Kit 1977 - 1985 Harley-Davidson Sportster - CAD Plated — Colony #3208-28 Rocker Box Screw Kit 1977-1985 Harley-Davidson Sportster - CAD Plated
$51.70

Colony #3207-28 Rocker Box Screw Kit 1957 - 1976 Harley-Davidson Sportster - CAD Plated — Colony #3207-28 Rocker Box Screw Kit 1957-1976 Harley-Davidson Sportster - CAD Plated
$49.50

Colony #2325-3 Oil Pump Plug Kit CAD 1952-54 Harley Davidson K KH — Colony #2325-3 Oil Pump Plug Kit 1952-1954 Harley-Davidson K/KH - CAD Plated
1 review $23.93

Colony #3066-36 Valve Cover Kit 1939-1948 Harley-Davidson UL/ULH - CAD Plated
2 reviews $236.50

Colony #3030-20 Upper Pushrod Covers Kit 1940-1947 Harley-Davidson Knucklehead - CAD Plated
$50.08

Colony #2886-24 Valve Spring Cover Kit 1937-1938 Harley-Davidson Big Twin Side Valve - CAD Plated
1 review $198.00

Colony #2979-28 Stock Fastener Motor Case Kit 1930-1936 Harley-Davidson VL - CAD Plated
1 review $51.70

Colony #2717-20 Valve Spring Cover Kit 1942-1973 Harley-Davidson 45s - CAD Plated
4 reviews $105.60

Colony #2642-20 Valve Spring Cover Kit 1931-1941 Harley-Davidson Davidson 45's - CAD Plated
$105.60

Colony #2595-13 Top Motor Mount Hardware 1952-1972 Harley-Davidson Big Twin 1957-1972 Sportster - CAD Plated
3 reviews $22.00

Colony #2948-3 Circuit Breaker Mounting Clamp & Stud Kit 1966-1969 Harley-Davidson FL/FLH - CAD Plated
1 review $15.73

Colony #2632-3 Circuit Breaker Adjusting Screw Kit 1947-1964 Harley-Davidson Big Twins/45's - CAD Plated
$12.10

Colony #2892-3 Starter Crank Clamp Bolt 1941-1967 Harley-Davidson FL/FLH - CAD Plated
$8.47

Colony #2863-7 Negative Brush Holder Assembly 1932-1951 Harley-Davidson Big Twins/45s - CAD Plated
$7.87

Colony #2824-1 Crankcase and Chain Housing Drain Plug 1965-1984 Harley-Davidson FL 1971-1984 FX 1967-1992 Sportster - CAD Plated
$7.26

Colony #2727-1 Chain Housing Top or Shifter Lever Pivot Screw 1965-1984 Harley-Davidson FL 1971-1984 FX - CAD Plated
1 review $7.26

Colony #2878-3 Starter Crank Pin Stud Kit 1936-Up Harley-Davidson Big Twins - CAD Plated
2 reviews $6.05

#2365-16 Lifter Base Screw Kit Special Harley Big Twins 54-75 — Colony #2365-16 Lifter Base Screw Kit 1954-1975 Harley-Davidson Big Twins - CAD Plated
$20.57

Colony #2185-4 Upper Bracket BoltAnd Lock Kit 1949-1984 Harley-Davidson FL 1958-1973 Servicar - CAD Plated
$19.36

Colony #2410-1 Pivot Stud 1973-1978 Harley-Davidson Sportster - CAD Plated
$16.70

Colony #2374-1 Oil Pump Fitting 7/16-20 Thread Harley-Davidson - CAD Plated
$12.53

Colony #2020-8 Rocker Shaft End Plug 1957-1970 Harley-Davidson Big Twin - CAD Plated
$35.13

Colony #9878-13 Motor Case Fastener Kit 1957-1976 Harley-Davidson Sportster - CAD Plated
$28.60

Colony #2018-8 Head Bolt Washers 1984-Early 1985 Harley-Davidson Big Twin/XL - CAD Plated
$28.97

Colony #9879-31 Motor Case Fastener Kit 1977-1990 Harley-Davidson Sportster - CAD Plated
2 reviews $18.76

Colony #2014-6 Oversize Panhead Valve Cover Screws 1948-1965 Harley-Davidson Panhead W/Alloy D Rings - CAD Plated
$19.12

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

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

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