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.

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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 #3123-20 Knurled Allen Rocker Cover Mounting Kit 2017-Up Harley-Davidson Touring Models - Chrome Plated
$31.68

Colony #3123-20-P Smooth Head Allen Rocker Cover Mounting Kit 2017-Up Harley-Davidson Touring Models - Chrome Plated
$44.44

Colony #3212-2 Front Cylinder Head Bolt 1942 Harley-Davidson WLA - Parkerized
$10.89

Colony #3166-1 Timer Screw 1970-E1978 Harley-Davidson FL 1971-E1978 FX/XL - Zinc Plated
$9.68

Colony #3191-4 Rocker Arm Shaft Nut Set 1936-1947 Harley-Davidson Knuckleheads - Parkerized
$65.99

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

Colony #9821-4-P Oil Filter Adaptor Mounting Kit Smooth Allen 1992-Up Harley-Davidson Big Twin - Chrome Plated
$5.58

Colony #3141-16 Lower Pushrod Cover Kit 2017-Up Harley-Davidson Touring Models - Chrome Plated
$66.63

Colony #3127-20 Headbolt Kit 1940-1947 Harley-Davidson Knuckleheads - Parkerized
$76.99

Colony #3103-17 Motor Case Stock Style Hardware Kit 1937-1939 Harley-Davidson 45s
$35.42

Colony #8523 Complete Show Bike Kit Cap Style Hardware Harley-Davidson 1992-1995 Softail Dyna Glide - Chrome Plated
$325.86

Colony #8522 Complete Show Bike Kit Cap Style Hardware Harley-Davidson 1991-2003 Sportster - Chrome Plated
$196.98

Colony #8518 Complete Show Bike Kit Cap Style Hardware Harley-Davidson 1985-1986 Big Twin Evo 5 Speed - Chrome Plated
$279.88

Colony #8510 Complete Show Bike Kit Cap Style Hardware Harley-Davidson 1970-1975 Shovelhead - Chrome Plated
$383.08

Colony #8509 Complete Show Bike Kit Cap Style Hardware Harley-Davidson 1966-1969 Shovelhead - Chrome Plated
$397.20

Colony #8508 Complete Show Bike Kit Cap Style Hardware Harley-Davidson 1958-1965 Panhead - Chrome Plated
$383.08

Colony #8507 Complete Show Bike Kit Cap Style Hardware Harley-Davidson 1948-1957 Panhead - Chrome Plated
$383.08

Colony #8505 Complete Show Bike Kit Cap Style Hardware Harley-Davidson 1936-1939 Knucklehead - Chrome Plated
$395.76

Colony #8469-13 Oil Pump Screw Cap Nut 1968-1977 Harley-Davidson Big Twins - Chrome Plated
$27.89

Colony #8467-24 Rocker Arm Cover Screw Cap Kit Harley-Davidson Panheads - Chrome Plated
$60.12

Colony #8466-7 Timing Cover Cap Screw Kit Harley-Davidson 74s - Chrome Plated
$23.54

Colony #8456-20 Head Bolt Kit Heat Treated 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$66.63

Colony #8455-16 Head Bolt Kit Heat Treated 1957-E1973 Harley-Davidson Sportster - Chrome Plated
$57.94

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

Colony #3433-14 Front Stand Mount Kit 1925-1929 Harley-Davidson 61"/74" Twins/J/JD - Nickle Plated
$42.08

Colony #3375-3 Left Bearing Bushing Screw 1929-1936 Harley-Davidson 45"/74"/80" Twins/C Singles Twins
$19.06

Colony #3781-10 Electric Terminal Plate 1954-1977 Harley-Davidson XLH 1970-1978 XLCH
$23.00

Colony #3782-10 Terminal Board Expansion Nut/Screw Kit 1954-1978 Harley-Davidson XL/XLH/XLCH
$14.30

Colony #3772-2 Spark Plug Hole Caps 1926-1934 Harley-Davidson Singles 1929-1955 Flatheads All Knuckleheads
$16.50

Colony #3771-20 Rocker Cover Allen Screw Kit 2017-Up Harley-Davidson Touring Models - Chrome Plated
$44.44

Colony #3754-1 Circuit Breaker Base Retainer 1936-1964 Harley-Davidson All Models
$21.45

Colony #3145-4 Rocker Box Drain Tube Kit 1936-1937 Harley-Davidson 61 Knucklehead
$35.00

Colony #3124-12-P Motor Case Polished Allen Mounting Kit 2017-Up Harley-Davidson Touring Models - Chrome Plated
$32.40

Colony #3124-12 Motor Case Knurled Allen Mounting Kit 2017-Up Harley-Davidson Touring Models - Chrome Plated
$27.00

Colony #3739-1 Chain Housing Plug 1980-1984 Harley-Davidson FLT 1983-1984 FXRT
$13.75

Colony #3738-1 Pinion Gear Nut 1990-1992 Harley-Davidson Big Twins
$15.40

Colony #3722-2 Sprocket Cover Pin 1941-1973 Harley-Davidson 45's
$9.90

Colony #3731-2 Crankcase Bolt Set 1930-1978 Harley-Davidson Big Twins - Chrome Plated
$14.30

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

Colony #3729-2 Crankcase Bolt Set 1930-1978 Harley-Davidson Big Twins - Parkerized
$14.30

Colony #3556-1 Sprocket Shaft Seal 1940-1954 Harley-Davidson Big Twins
$6.60

Colony #3658-8 Circuit Breaker To Coil Wire Fastener Assembly 1949-1964 Harley-Davidson Twins/K/KH/Sportster
$9.90

Colony #3657-8 Circuit Breaker To Coil Wire Fastener Assembly 1936-1948 Harley-Davidson All Twins
$9.90

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 #3638-4 Pushrod Cover Seal Kit 1991-2003 Harley-Davidson Sportster
$11.00

Colony #3637-2 Oil Line Tube Seals 1992-1999 Harley-Davidson Big Twins
$6.60

Colony #3619-1 Cylinder Bracket 1932-1950 Harley-Davidson 45's w/Cast Iron Heads - Parkerized
$45.00

Colony 8761-7-P Timing Cover Smooth Allen Screw Kit 1970-1992 Harley-Davidson Shovelhead/Evo - Chrome Plated
1 review $14.51

Colony #3603-12 Pushrod Cover O-Ring Seals 1979-1985 Harley-Davidson Sportster XL
$8.78

Colony #8703-2 Oil Pump Screen Check Relief Plug 1981-Up Harley-Davidson Big Twins - Chrome Plated
$12.34

Colony #3229-5 Circuit Breaker Post Rebuild Kit 1930-1948 Harley-Davidson Al lModels
$17.86

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

Colony #3273-20 Valve Spring Cover Kit 1931-1941 Harley-Davidson 45's - Chrome Plated
$127.60

Colony #3057-4 Lower Valve Spring Cover Kit 1952-1956 Harley-Davidson K Models
$88.00

Colony #3058-10 Rear Motor Mount & Sprocket Cover Mounting Kit 1983-1985 Harley-Davidson XL - Zinc Plated
$27.50

Colony #3051-1 Oversized Drain Plug 1965-1984 Harley-Davidson FL 1971-1984 FX Chain Housing 1967-1992 XL Crankcase - Zinc Plated
$7.26

Colony #1028-P Complete Show Bike Kit Polished Allen 2017-Up Harley-Davidson Touring Models - Chrome Plated
$245.03

Colony #1027-P Complete Show Bike Kit Polished Allen 2007-Up Harley-Davidson VRSC - Chrome Plated
$173.38

Colony #3690-16 Plain Head Lower Motor Mount Kit 1936-1957 Harley-Davidson OHV Big Twins - Parkerized
$40.70

Colony #3687-15 Lower Motor Mount Kit 1937-1947 Harley-Davidson Side Valve Big Twins - Parkerized
$39.88

Colony #3682-16 Lower Motor Mount Kit 1958-1965 Harley-Davidson OHV Big Twins - Chrome Plated
$33.55

Colony #3681-16 Lower Motor Mount Kit 1958-1965 Harley-Davidson OHV Big Twins - Parkerized
$30.80

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

Colony #3679-16 Lower Motor Mount Kit 1936-1957 Harley-Davidson OHV Big Twins - Chrome Plated
$44.28

Colony #3552-6 Clutch Cover Mounting Kit 2004-Up Harley-Davidson XL - Chrome Plated
$8.47

Colony #3535-6 Timing Cover Screw Kit 1970-1992 Harley-Davidson Shovelhead & Evolution
1 review $7.74

Colony #3435-1 Cylinder Bracket for Cast Iron Heads 1932-Up Harley-Davidson 45's & Servi-car with Iron Heads - Parkerized
$45.00

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