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.

Raw JRC Engineering Motorcycle Engine

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British Standard Oil Pump unit Triumph Motorcycles 1963-1980 - Made in the UK OEM # 70-9421
12 reviews $162.03

British Standard Main Roller Bearing for 1966 - 1972 Triumph 650 Unit Twin Motorcycles OEM # 70-2879
13 reviews $198.47

British Standard Engine Oil Seal Kit - 7 Piece - 1963 - 1972 Triumph Unit 650
21 reviews $50.19

EMGO Pistons for Triumph 650 c.c. Motorcycles - +0.060
3 reviews $114.66

British Standard Rod Bearings for Triumph 650 and 750 c.c. Motorcycles - Standard OEM # 70-3586
19 reviews $91.75

British Standard Triumph Crankshaft Main Bearing- Right Side- OEM part# 70-1591
3 reviews $84.22

EMGO Top End Engine Gasket Set Triumph 650cc 1963-72 T120 Bonneville TR6 Tiger
6 reviews $77.14

British Standard Triumph Copper Head Gasket 9 Bolt - 650cc Triumph twins 1963 & up OEM # 70-4547
7 reviews $33.96

SRM Engineering SRM Oil Pressure Release Valve for pre unit Triumphs
5 reviews $120.99

Grant Piston Rings Piston Rings for Triumph 650 c.c. Motorcycles - .060 over
$60.45

SRM Engineering SRM Oil Pressure Release Valve for unit Triumph & BSA Motorcycles
11 reviews $114.90

EMGO Pistons for Triumph 650 c.c. Motorcycles - +0.040
1 review $114.66

EMGO Pistons for Triumph 650 c.c. Motorcycles - +0.020
4 reviews $114.66

British Standard Rocker Box Oil Feed Pipe for Triumph 650 / 750 c.c. 1963 - 1982 #71-2428
5 reviews $92.41

British Standard Rocker Box Caps / Covers - Starburst MCM Style - for Triumph Motorcycles 1963 - 1972
5 reviews $111.80

British Standard Metric Timing Side Crankshaft Bearing for 1972-80 Triumph 650 750 Unit Twin Motorcycles OEM # 70-3835
$87.90

British Standard Pushrod Tube Seal Kit - Triumph 650
18 reviews $26.46

British Standard Sludge Tube for your 650cc 750cc Triumph Motorcycle OEM # 70-3903
6 reviews $27.52

Grant Piston Rings Piston Rings for Triumph 650 c.c. Motorcycles - STD
2 reviews $60.45

British Standard Allen Sludge Trap Plug for your Triumph Motorcycle
9 reviews $22.33

EMGO Top End Engine Gasket Set with Head Gasket Triumph 750cc 1973-1983 T140 Bonneville TR7
$59.15

British Standard Side Cover Allen Hardware Set - Stainless- Triumph 650 c.c. Motorcycles 1963 - 1968
12 reviews $42.35

British Standard Outer Gearbox Gasket for unit 650cc and 750cc Triumph Motorcycles 1963 and Up OEM #71-1448
12 reviews $8.77

British Standard Rocker Box Gaskets 1963-1970 Triumph 650cc T120 Bonneville/TR6/Tiger
$8.19

British Standard Points Cover Gasket Triumph Twins and Singles
8 reviews $5.30

British Standard Rotor Key - Triumph Unit 650 750
2 reviews $8.37

British Standard Ignition Pillar Bolt - Triumph / BSA
7 reviews $7.60

Grant Piston Rings Piston Rings for Triumph 650 c.c. Motorcycles - .040 over
$60.45

Grant Piston Rings Piston Rings for Triumph 650 c.c. Motorcycles - .020 over
$60.45

Kibblewhite Precision Machining Chrome Moly Pushrods for 650cc Triumph Twins Race or Street Use
11 reviews $80.30

EMGO Pistons for Triumph 650 c.c. Motorcycles - Standard
2 reviews $114.66

British Standard Engine and Transmission Lock Tab Set - 1963 - 1972 Triumph 650 with 4 Speed Gearbox
14 reviews $20.86

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