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 #7711-18-45 Head Bolt Set 1940-1954 Harley-Davidson 45's with Aluminum Heads - CAD Plated
$88.72

Colony #8311 CAD Complete Stock Hardware Kit - 1970-1975 Harley-Davidson Shovelhead - CAD Plated
1 review $300.09

Colony #8005-12 Electrical Terminal Box Assembly1948-1969 Harley-Davidson Big Twins & 45's
2 reviews $55.04

Colony #7825-20 Grade 8 Head Bolt Kit 1948-Up Harley-Davidson Panhead/Shovelhead - CAD Plated
$43.99

Colony #9799-20 Front Motor Mount Kit Stock 1957-1984 Harley-Davidson Sportster - CAD Plated
13 reviews $40.61

Colony #8225-8 Rocker Shaft End Plug & Cap Kit 1971-Up Harley-Davidson Shovelhead 1971-1985 XL - CAD Plated
2 reviews $31.81

Colony #3590-3 Oil Line Nuts for 3/8 inch Rubber Lines 1915-1964 Harley-Davidson - CAD Plated
1 review $23.10

Colony #2966-10 Grade 8 Head Bolt Kit 1977-1984 Harley-Davidson Shovelhead - CAD Plated
3 reviews $44.00

Colony #9641-16 Head Bolt Kit 1952-1953 Harley-Davidson K Model - CAD Plated
$85.45

Colony #9918-8 Rocker Arm Stud Nut Kit 1948-1965 Harley-Davidson Panhead - CAD Plated
2 reviews $19.12

Colony #3031-4 Upper Inner Pushrod Covers 1957-1985 Harley-Davidson Sportster 1936-1983 OHV Big Twin - CAD Plated
1 review $34.05

Colony #7710-18 Head Bolt Washer Kit 1940-1947 Harley-Davidson 45's/75's/80's with Aluminum Heads - CAD Plated
1 review $33.31

Colony #3310-17 Motor Case Kit 1932-1936 Harley-Davidson 45's - CAD Plated
$64.35

Colony #2369-8 Cylinder Head Motor Brace Mounting Kit 1948-1965 Harley-Davidson Panhead - CAD Plated
6 reviews $19.48

Colony #8942-14 Frame Electrical Terminal Screws & Fittings 1936-1947 Harley-Davidson Big Twins 45's - CAD Plated
$14.52

Colony #8126-34 Motor Case Kit Stock 1940-1948 Harley-Davidson Flathead - CAD Plated
$51.70

Colony #3689-15 Lower Motor Mount Kit 1937-1947 Harley-Davidson Side Valve Big Twins - CAD Plated
$39.88

Colony #9409-22 Oil Pump Mounting Kit 1937-1973 Harley-Davidson 45's - CAD Plated
$38.01

Colony #8609-36 Rocker Box Nut Kit 1966-1983 Harley-Davidson Shovelhead - CAD Plated
$12.67

Colony #2946-1 Cylinder Bracket for Aluminum Heads 1936-1952 Harley-Davidson WL 45 1936-1973 Servi-car - CAD Plated
$37.00

Colony #8735-24 Valve Cover Screws 45/64 inch Long 1954-1965 Harley-Davidson Panhead With Steel D-Rings - CAD Plated
1 review $34.93

Colony #8733-24 Valve Cover Screws 1-1/4 inch Long 1954-1965 Harley-Davidson Panhead With Alloy D-Rings - CAD Plated
$34.93

Colony #9635-4 Oil Pump Check & Relief Valve Plugs 1981-Up Harley-Davidson FL/FX - CAD Plated
$15.94

Colony #8105-16 Cylinder Base Nuts & Lock Washers 1930-1978 Harley-Davidson Big Twins - CAD Plated
2 reviews $15.64

Colony #2505-1 Spark Plug Front Cable Clamp 1936-1969 Harley-Davidson 74 OHV - CAD Plated
$7.70

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

Colony #9639-22 Electrical Terminal Plate 1970-1977 Harley-Davidson FL/FX - CAD Plated
$29.24

Colony #2610-1 Switch Stem Handle 19387-1938 Harley-Davidson Big Twins - CAD Plated
$14.52

Colony #2062-8 Cam Cover Phillips Screw Kit 1971-1980 Harley-Davidson Sportster - CAD Plated
1 review $14.52

Colony #8741-19 Oil Pump Mounting Kit 1936-1967 Harley-Davidson OHV Big Twins - CAD Plated
$27.50

Colony #9832-28 Rocker Box Hex Screw Kit 1977-1985 Harley-Davidson Sportster - CAD Plated
$25.84

Colony #9413-19 Timing Cover Screw Kit Stock 1937-1973 Harley-Davidson 45s - CAD Plated
$25.28

Colony #9795-12 Timing Cover Screw Kit 1/4-20 After Market Harley-Davidson Cases - CAD Plated
$21.30

Colony #8150-12 Timing Cover Screw Kit 1936-1969 Harley-Davidson Big Twins - CAD Plated
$21.30

Colony #2370-8 Cylinder Head Motor Brace Mounting Kit 1966-1984 Harley-Davidson Shovelhead - CAD Plated
2 reviews $20.85

Colony #8895-9 Cam Cover Screw Kit 1952-1970 Harley-Davidson K/KH/XL/XLCH/XLH - CAD Plated
$19.80

Colony #8779-12 Rocker Box Mounting Kit 1936-1947 Harley-Davidson Knucklehead - CAD Plated
$19.51

Colony #9215-2 Oil Fill Plug Drain Plug 1948-1966 2 Cycle Harley-Davidson 125/165/175 - CAD Plated
$17.92

Colony #2623-1 Oil Pressure Switch Nipple 1939-1969 Harley-Davidson Big Twins - CAD Plated
$8.47

Colony #2520-1 Timer Wire Clip 1938-1965 Harley-Davidson Big Twin - CAD Plated
1 review $5.57

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

Colony #8709-8 Lifter Base Screw Kit 1976-Up Harley-Davidson Big Twin - CAD Plated
1 review $14.34

Colony #8230-2 Cylinder Head Bolt Spacers 1937-1973 Harley-Davidson 45's - CAD Plated
$13.94

Colony #7612-3 Oil Line/Vent Line Fittings Pre-1965 Harley-Davidson Big Twins - CAD Plated
1 review $13.94

Colony #2363-3 Wheel Cylinder 3/8"-24 Banjo Bolt 1958-1972 Harley-Davidson FL/FLH - CAD Plated
$13.92

Colony #2735-1 Oil Line Fitting Replaces OEM# 63533-41 - CAD Plated
$4.24

Colony #8772-2 Timing Cover Oil Passage Bolt 1963-1969 Harley-Davidson Big Twin OEM# 25218-63 - CAD Plated
$11.96

Colony #9875-2 Oil Screen Plug 1966-1969 Harley-Davidson Big Twins - CAD Plated
$11.14

Colony #9306-7 Timing Cover Screw Kit 1970-1980 Harley-Davidson Shovelhead - CAD Plated
$10.04

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

Colony #3721-1 Ovesize Allen Timing Plug 1970-1998 Harley-Davidson Dyna 1970-1999 Softail 1970-2003 Sportster - CAD Plated
$7.58

Colony #3326-2 Oil Pump Cover to Oil Filter Line Fitting 1950-1957 Harley-Davidson Big Twin - CAD Plated
1 review $7.26

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

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

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

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

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

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

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

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

Colony #8309 CAD Complete Stock Hardware Kit - 1937-1973 Harley-Davidson 45 with Aluminum Head - CAD Plated
$328.94

Colony #8308 CAD Complete Stock Hardware Kit - 1937-1973 Harley-Davidson 45 with Cast Iron Head - CAD Plated
$303.96

Colony #8306 CAD Complete Stock Hardware Kit - 1940-1948 Harley-Davidson 74 & 80 Aluminum Head - CAD Plated
$339.82

Colony #8304 CAD Complete Stock Hardware Kit - 1937-1939 Harley-Davidson 74 & 80 Cast Iron Head - CAD Plated
$306.59

Colony #8325 CAD Complete Stock Hardware Kit - 1954-1956 Harley-Davidson K Model - CAD Plated
$245.74

Colony #8321 CAD Complete Stock Hardware Kit - 1977-1980 Harley-Davidson Sportster - CAD Plated
$226.60

Colony #8315 CAD Complete Stock Hardware Kit - 1957-1966 Harley-Davidson Sportster XL/XLH - CAD Plated
$247.50

Colony #8815-15 Oil Pump Stud & Nut Kit 1952-E1971 Harley-Davidson Sportster - CAD Plated
$19.12

Colony #8712-8 Lifter Base Screw Kit Pre-1976 Harley-Davidson Cases With Late Lifters - CAD Plated
$14.34

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