Motorcycle Engine
James Gaskets
Primary Cover & Inspection Cover Gasket Kit With Seals 1984-1986 Harley-Davidson FL/FLH/FX/FXE/FXWG 1984-1988 Softail
$68.87
Drag Specialties
Chrome Rocker Box Cover 1992-1999 Harley-Davidson EVO Big Twins
$354.27
Colony
#8310 Complete Stock Hardware Kit 1948-1966 Harley-Davidson 2 cycle 125/165/175 cc - CAD Plated
$57.57
Colony
#1019 Complete Show Bike Kit Allen Hardware Harley-Davidson 1987-1991 FLT/FXR - Chrome Plated
$208.91
Colony
#1009 Complete Show Bike Kit Allen Hardware Harley-Davidson 1979-1984 FLT 5 Speed - Chrome Plated
$167.71
Colony
#1008 Complete Show Bike Kit Allen Hardware Harley-Davidson 1985-1986 Evo 5 Speed - Chrome Plated
$181.91
Colony
#7110-8 Knuckle Nut Set With O-ring Seal - 1936-1947 Harley-Davidson Knucklehead - Chrome Plated
$47.80
Colony
#7017-16 High Crown Acorn Cylinder Base Nut Set - 1930-1977 Harley-Davidson 74's - Chrome Plated
$21.66
Colony
#3092-24 Valve Spring Cover Kit 1937-1938 Harley-Davidson Big Twin Side Valve - 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
#3688-15 Lower Motor Mount Kit 1937-1947 Harley-Davidson Side Valve Big Twins - Chrome Plated
$43.45
Colony
#3452-4 Rocker Plate Stud Bushings 1913-1929 Harley-Davidson All Models 1930-1934 21" Singles
$35.20
Colony
#3447-7 Oversized Cylinder Head Stud Kit 1926-1932 Harley-Davidson A & B Singles - Parkerized
$46.20
Colony
#8309 CAD Complete Stock Hardware Kit - 1937-1973 Harley-Davidson 45 with Aluminum Head - CAD Plated
$328.94
Colony
#8306 CAD Complete Stock Hardware Kit - 1940-1948 Harley-Davidson 74 & 80 Aluminum Head - CAD Plated
$339.82
The Heart of Your Build: Custom Motorcycle Engine Parts
The engine is the soul of your motorcycle, and keeping it running strong is what it's all about. Whether you're rebuilding a classic ironhead motor for sale you just scored or boosting the pe...
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Motorcycle Engine FAQ
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.