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 #8488-10 Cylinder Head Bolt Washers 1948-Up Harley-Davidson OEM# 6469 - Chrome Plated
$9.96

Colony #2809-3 Clutch and Brake Hand Lever Clamp Bushing Kit 1949-1964 Harley-Davidson All Models - CAD Plated
$9.90

Colony #2730-3 Clutch and Brake Hand Lever Clamp Bushing Kit 1941-1948 Harley-Davidson - CAD Plated
1 review $9.90

Colony #3671-1 Starter Solenoid Plunger Cover 1965-1988 Harley-Davidson Big Twins 1967-1980 XL
$9.68

Colony #9525-1 Oil Pump Check Valve Plug 1936-1980 Harley-Davidson Big Twin 1937-Up UL/45s - Parkerized
$9.56

Colony #9528-1 Oil Pump Bypass Valve Plug 1936-1952 Harley-Davidson OHV Big Twins - Parkerized
$9.56

Colony #8782-4-P Lifter Base Smooth Allen Screw Kit 1957-1990 Harley-Davidson Sportster - Chrome Plated
1 review $9.56

Colony #9960-1 Oversize Plated Allen Timing Plug 11/16"-16 Threads Harley-Davidson OEM# 720 - Chrome Plated
1 review $9.56

Colony #9524-1 Oil Pump Check Valve Plug 1936-1980 Harley-Davidson Big Twin 1937-Up UL/45s - CAD Plated
$9.56

Colony #3549-5 Inner Primary to Motor Seals 2006-Up Harley-Davidson Dyna 2007-Up Softail/Touring Models
1 review $9.08

Colony #2376-1 Crank Pin and Sprocket Shaft Nut Harley-Davidson OEM# 8010
$9.08

Colony #2289-1 Motor Sprocket Nut 1929-Up Harley-Davidson 45s - Parkerized
$9.08

Colony #9529-12 Pushrod Cover O-Ring Seal Kit Harley-Davidson Big Twin Evo/Twin Cam/Sportster
3 reviews $8.78

Colony #3557-1 Sprocket Shaft Bearing Retainer Seal 1955-1968 Harley-Davidson 74's
$8.25

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

Colony #8211-2 Sprocket Shaft Seal Assembly 1939-1973 Harley-Davidson 45's
3 reviews $3.89

Colony #9845-4 Lifter Base Hex Screw Kit 1957-1985 Harley-Davidson Sportster - Chrome Plated
$7.45

Colony #2624-2 Oil Pump Cover Oil Pipe Nipple 1950-1964 Harley-Davidson Big Twins - CAD Plated
3 reviews $7.26

Colony #2586-1 Timer Cable Clamp 1949-1964 Harley-Davidson Big Twin - CAD Plated
1 review $7.26

Colony #2285-1 Motor Sprocket Nut 1993-Up Harley-Davidson Sportster - Zinc Plated
1 review $7.15

Colony #2496-2 Tappet Oil Screen and Spring 1966-1969 Harley-Davidson Shovelhead
$6.96

Colony #3558-1 Sprocket Shaft Seal 1939-1973 Harley-Davidson 45's
$6.60

Colony #2494-3 Ignition Module Side Cover Button Allen Screw Kit 1986-2002 Harley-Davidson Sportster - Chrome Plated
3 reviews $6.38

Colony #9665-8 Circuit Breaker & Relay Screw Kit 1937-1973 Harley-Davidson 45's - Parkerized
$5.96

Colony #9631-1 Oil Pump Stud Nut Short 1941-1948 Harley-Davidson 74/80 SV 1941-1954 45's - Parkerized
$5.58

Colony #9675-1 Motor Case Drain Plug 1911-1970 Harley-Davidson 1968-1984 Oil Pump Body - Parkerized
1 review $5.50

Colony #3801-17 Timing Cover Screw Kit 1932-1936 Harley-Davidson RL/RLD/RLE/Servi-car - CAD Plated
$20.35

Colony #3795-2 Cam Shaft Lever Screw & Nut Kit 1934-1936 Harley-Davidson RL/VL/Servi-car
$15.40

Colony #3427-1 Head Cone Washer 1936-1934 Harley-Davidson Singles and All 45 Twins - CAD Plated
$8.47

Colony #3381-1 Lower Head Cone 1930-1938 Harley-Davidson 1930-1934 C Singles - CAD Plated
$22.00

Colony #3370-20 Sprocket Cover Stud Kit 1928-1934 Harley-Davidson Singles/45 Twins - CAD Plated
$32.84

Colony #8524 Complete Show Bike Kit Cap Style Hardware Harley-Davidson 1996-1999 Softail 1996-1998 Dyna Glide - Chrome Plated
$320.07

Colony #8310 Complete Stock Hardware Kit 1948-1966 Harley-Davidson 2 cycle 125/165/175 cc - CAD Plated
$57.57

Colony #1023 Complete Show Bike Kit Allen Hardware Harley-Davidson 2006-up Dyna - Chrome Plated
$227.39

Colony #1022-P Complete Show Bike Kit Smooth Allen Hardware Harley-Davidson 2004-up Sportster - Chrome Plated
$193.28

Colony #1019 Complete Show Bike Kit Allen Hardware Harley-Davidson 1987-1991 FLT/FXR - Chrome Plated
$208.91

Colony #1018 Complete Show Bike Kit Allen Hardware Harley-Davidson 2000-2006 Twin Cam Softail - Chrome Plated
$218.87

Colony #1016-P Complete Show Bike Kit Smooth Allen Hardware Harley-Davidson 1977-1985 Sportster - Chrome Plated
$220.29

Colony #1012-P Complete Show Bike Kit Smooth Allen Hardware Harley-Davidson 1970-1975 Shovelhead - Chrome Plated
$217.45

Colony #1009 Complete Show Bike Kit Allen Hardware Harley-Davidson 1979-1984 FLT 5 Speed - Chrome Plated
$167.71

Colony #1008-P Complete Show Bike Kit Smooth Allen Hardware Harley-Davidson 1985-1986 Evo 5 Speed - Chrome Plated
$216.03

Colony #1008 Complete Show Bike Kit Allen Hardware Harley-Davidson 1985-1986 Evo 5 Speed - Chrome Plated
$181.91

Colony #1007-P Complete Show Bike Kit Smooth Allen Hardware Harley-Davidson 1984-1986 Evo 4 Speed - Chrome Plated
$227.39

Colony #2914-2 Rocker Stud Spacer Kit 1931-1940 Harley-Davidson Big Twin - CAD Plated
$13.31

Colony #2906-2 Crank Pin Nut Set 1936-1940 Harley-Davidson 61" 1937-1940 Sidevalves
$29.00

Colony #2901-4 Crank Pin Nut Lock Plates 1936-1940 Harley-Davidson Big Twins
$7.26

Colony #2893-3 Starter Crank Clamp Bolt 1941-1967 Harley-Davidson FL/FLH - Chrome Plated
$6.05

Colony #2891-3 Starter Crank Clamp Bolt 1941-1967 Harley-Davidson FL/FLH - Parkerized
$8.47

Colony #9970-20 Upper Pushrod Cover Kit Harley-Davidson Twin Cam 1999-Up - Chrome Plated
$50.08

Colony #9969-4 Upper Inner Pushrod Covers 1999-Up Harley-Davidson Twin Cam
$39.11

Colony #9843-8 Chrome Countersink Washer Set for #10 Flat Head Socket Screws Harley-Davidson - Chrome Plated
$13.94

Colony #7110-8 Knuckle Nut Set With O-ring Seal - 1936-1947 Harley-Davidson Knucklehead - Chrome Plated
$47.80

Colony #7109-2 Crank Pin Nut - 1937-1948 Harley-Davidson 74's/80's 1936-52 61 OHV
$18.70

Colony #7100-13 Oil Pump Acorn Nut & Block Off Plug Set - 1936-1967 Harley-Davidson Davidson 74's - Chrome Plated
$20.31

Colony #7017-16 High Crown Acorn Cylinder Base Nut Set - 1930-1977 Harley-Davidson 74's - Chrome Plated
$21.66

Colony #2068-10 Allen Screw Motor Case Kit - 1977-1990 Harley-Davidson Sportster - Chrome Plated
$31.35

Colony #3644-16 Cylinder Base Nut Kit 1911-1929 Harley-Davidson JD - Nickel Plated
$16.50

Colony #3622-1 Oil Pump Feed Line Nut 1938-1957 Harley-Davidson Big Twins - CAD Plated
$7.70

Colony #8318 Stock Hardware Kit Late 1930-1936 Harley-Davidson VL - Parkerized
$302.50

Colony #8323 Stock Hardware Kit Early 1930 Harley-Davidson VL - Parkerized
$302.50

Colony #3092-24 Valve Spring Cover Kit 1937-1938 Harley-Davidson Big Twin Side Valve - Chrome Plated
$231.00

Colony #3091-24 Valve Spring Cover Kit 1930-1936 Harley-Davidson VL - Chrome Plated
$231.00

Colony #7936 Complete Show Bike Kit Acorn Hardware 2017-Up Harley-Davidson Touring Models - Chrome Plated
$331.25

Colony #1028 Complete Show Bike Kit Knurled Allen 2017-Up Harley-Davidson Touring Models - Chrome Plated
$200.45

Colony #1027 Complete Show Bike Kit Knurled Allen 2007-Up Harley-Davidson VRSC - Chrome Plated
$112.28

Colony #3691-15 Plain Head Lower Motor Mount Kit 1937-1947 Harley-Davidson Side Valve Big Twins - Parkerized
$39.88

Colony #3688-15 Lower Motor Mount Kit 1937-1947 Harley-Davidson Side Valve Big Twins - Chrome Plated
$43.45

Colony #3686-12 Lower Motor Mount Kit 1966-1969 Harley-Davidson OHV Big Twins - CAD Plated
$33.00

Colony #3684-12 Lower Motor Mount Kit 1966-1969 Harley-Davidson OHV Big Twins - Parkerized
$33.00

Colony #3683-16 Lower Motor Mount Kit 1958-1965 Harley-Davidson OHV Big Twins - CAD Plated
$30.80

Colony #3550-5 Shifter Gear Retaining Springs 1938-1973 Harley-Davidson 45
$12.10

Colony #3536-16 Head Bolt Set 1940-1951 Harley-Davidson WR/WLDR - CAD Plated
$109.62

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