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

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

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

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

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

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

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

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 #9527-1 Oil Pump Bypass Valve Plug 1936-1952 Harley-Davidson Big Twin 1937-Up UL/45s - CAD Plated
$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 #9645-2 Oil Screen Plug 1981-Up Harley-Davidson FL/FX - CAD Plated
$7.96

Colony #9403-1 Timing Plug 1970-Up Harley-Davidson OEM# 720 - CAD Plated
3 reviews $9.35

Colony #9615-10 Oil Pump Mounting Kit Late 1971-1976 Harley-Davidson Sportster - CAD Plated
$7.17

Colony #9841-8 Rocker Shaft End Nut Kit 1936-1947 Harley-Davidson Knucklehead - CAD Plated
$6.38

Colony #9415-8 Circuit Breaker & Relay Screw Kit 1937-1973 Harley-Davidson 45's - CAD Plated
$5.96

Colony #8945-16 Head Bolt Set 1957-1972 Harley-Davidson Sportster - CAD Plated
$51.78

Colony #8129-34 Motor Case Kit Stock 1936-1939 Harley-Davidson Knucklehead - CAD Plated
1 review $51.70

Colony #8144-34 Motor Case Kit Stock 1979-1995 Harley-Davidson Shovelhead/Evo - CAD Plated
$51.70

Colony #8141-34 Motor Case Kit Stock 1970-1978 Harley-Davidson Shovelhead - CAD Plated
$51.70

Colony #8135-34 Motor Case Kit Stock 1948-1964 Harley-Davidson Panhead - CAD Plated
2 reviews $51.70

Colony #8132-34 Motor Case Kit Stock 1940-1947 Harley-Davidson Knucklehead - CAD Plated
$51.70

Colony #8774-18 Footboard Hinge Bolt Buddy Footrest Kit 1941-1964 Harley-Davidson - CAD Plated
$20.65

Colony #8628-6 Slotted 1/4-24 Thread Motor Case Nuts All Pre-1930 Harley-Davidson - CAD Plated
$19.93

Colony #8941-3 Rocker Box Oil Feed Line Fittings 1942-1947 Harley-Davidson Knucklehead OEM# 95-42 95-42A - CAD Plated
$19.51

Colony #8605-16 Lifter Base Screw Kit Hex Head 1954-1974 Harley-Davidson Big Twin - CAD Plated
$20.57

Colony #8819-4 Clutch & Brake Lever Pivot Screw Kit 1941-1964 Harley-Davidson Big Twin/45s - CAD Plated
1 review $12.10

Colony #8401-8 Rocker Shaft Cap Nut & Washer Kit 1966-1985 Harley-Davidson Shovelhead 1957-1985 Sportster - CAD Plated
1 review $9.96

Colony #8630-1 Rocker Feedline Nipple 1936-1941 Harley-Davidson OHV 1937-1952 45's Vent Line - CAD Plated
1 review $8.78

Colony #8611-1 Timing Plug 1931-1938 Harley-Davidson 5/8-18 Thread OEM# 2326-26 - CAD Plated
2 reviews $8.78

Colony #8620-17 Motor Case Kit 1940-1973 Harley-Davidson 45's - CAD Plated
$35.42

Colony #8825-16 Lower Motor Mount Kit All Harley-Davidson 45s 1930-1936 VL - CAD Plated
$33.84

Colony #8223-8 Rocker Shaft End Plug & Cap Kit 1966-1970 Harley-Davidson Shovelhead 1957-1970 XL - CAD Plated
1 review $31.81

Colony #8615-4 Rocker Shaft End Caps 1971-Up Harley-Davidson Shovelhead 1971-1984 XL - CAD Plated
$27.51

Colony #7714-20 Head Bolt Set CAD Plated 1940-1947 Harley-Davidson Knucklehead Engines - CAD Plated
$64.09

Colony #8165-19 Upper And Lower Motor Mount Kit 1936-1969 Harley-Davidson Big Twin OHV - CAD Plated
3 reviews $52.45

Colony #7615-4 Early Style Battery Terminal Screw Kit Fits All 6 volt Harley-Davidson Pre-1965
$16.34

Colony #8107-16 Cylinder Base Nuts & Lock Washers Harley-Davidson Sportster & 45's - CAD Plated
$13.78

Colony #8170-10 Cylinder Head Bolt Washers OEM 6469 All 1948-Up Harley-Davidsons - CAD Plated
$6.78

Colony #8120-1 Starter Crank Pin Stud 1936-Up Harley-Davidson Big Twins - CAD Plated
$5.18

Colony #8109-1 Long Oil Pump Nut Pre-1967 Harley-Davidson Big Twins - CAD Plated
$5.18

Colony #8305 CAD Complete Stock Hardware Kit - 1940-1948 Harley-Davidson 74 & 80 Cast Iron Head - CAD Plated
$305.07

Colony #8324 CAD Complete Stock Hardware Kit - 1952-1953 Harley-Davidson K Model - CAD Plated
$246.48

Colony #8322 CAD Complete Stock Hardware Kit - 1981-1985 Harley-Davidson Sportster - CAD Plated
$225.50

Colony #8320 CAD Complete Stock Hardware Kit - 1974-1976 Harley-Davidson Sportster - CAD Plated
2 reviews $232.10

Colony #8319 CAD Complete Stock Hardware Kit - 1971-1973 Harley-Davidson Sportster - CAD Plated
1 review $238.70

Colony #8317 CAD Complete Stock Hardware Kit - 1967-1970 Harley-Davidson Sportster XLH and 1970 XLCH - CAD Plated
$253.00

Colony #8316 CAD Complete Stock Hardware Kit - 1957-1969 Harley-Davidson Sportster XLCH - CAD Plated
1 review $248.60

Colony #8301 CAD Complete Stock Hardware Kit - 1940-1947 Harley-Davidson Knucklehead - CAD Plated
$295.30

Colony #8303 CAD Complete Stock Hardware Kit - 1958-1965 Harley-Davidson Panhead - CAD Plated
1 review $221.05

Colony #8302 CAD Complete Stock Hardware Kit - 1948-1957 Harley-Davidson Panhead - CAD Plated
1 review $216.35

Colony #8312 CAD Complete Stock Hardware Kit - 1976-1978 Harley-Davidson Shovelhead - CAD Plated
1 review $295.38

Colony #8307 CAD Complete Stock Hardware Kit - 1966-1969 Harley-Davidson Shovelhead - CAD Plated
$279.10

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