Motorcycle Engine
Colony
#7157-20 Heat Treated Acorn Head Bolt Kit - 1940-1947 Harley-Davidson Knucklehead - Chrome Plated
$66.63
Colony
#7136-14 High Crown Acorn Rocker Box Bolt Kit - 1957-1976 Harley-Davidson Sportster - Chrome Plated
1
$61.56
Colony
#7133-8 Stock Aluminum Pushrod Covers - 1936-1939 Harley-Davidson Knucklehead - Chrome Plated
$80.00
Colony
#8164-19 Upper And Lower Motor Mount Kit 1936-1969 Harley-Davidson Big Twin OHV - Chrome Plated
5
$57.53
Colony
#7018-16 High Crown Cylinder Base Nut Set - 1957-1985 Harley-Davidson Sportster - Chrome Plated
$21.60
Colony
#7408-10 Over Length Front Motor Mount Studs With Acorn Nuts 1957-1985 Sportster - Chrome Plated
3
$21.12
Colony
#8102-16 Lifter Base Screw Kit 1936-1953 Harley-Davidson Big Twin & 1937-1973 45's - Chrome Plated
$19.25
Colony
#7813-8 High Crown Acorn Cylinder Base Nut Set 1978-1984 Harley-Davidson Shovelhead - Chrome Plated
2
$29.34
Colony
#7102-12 Acorn Head Rocker Box Bolt Set - 1936-1947 Harley-Davidson Knucklehead - Chrome Plated
$26.44
Gasbox
Top Motor Mount - 2007-up Harley-Davidson Sportster - With EFI Coil and Stock Ignition Switch Mounts
11
$49.95
British Standard
Inner Gearbox Gasket for Unit 650 and 750 Triumph Motorcycles OEM #57-7012 or 71-3096
8
$8.20
Lowbrow Customs
Triumph Oil Feed Brass Rocker Box Acorn Nuts and Copper Washers
18
$33.42
British Standard
Triumph Crankshaft Main Bearing - Right Side OEM #70-1591
3
$94.62
British Standard
Triumph 650 to 750 c.c Big Bore Kit for 1963-1972 Models
22
$999.95
SRM Engineering
SRM Oil Pressure Release Valve for pre unit Triumphs
5
$127.04
British Standard
Rocker Box Caps / Covers - Starburst MCM Style - for Triumph Motorcycles 1963 - 1972
6
$120.91
Colony
#8316 CHR Complete Stock Hardware Kit - 1957-1969 Harley-Davidson Sportster XLCH - Chrome Plated
2
$276.14
Colony
#8301 CHR Complete Stock Hardware Kit - 1940-1947 Harley-Davidson Knucklehead - Chrome Plated
$365.00
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.