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.

British Standard Motorcycle Engine

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British Standard Triumph 650 to 750 c.c Big Bore Kit for 1963-1972 Models
21 reviews $999.95

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

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

British Standard Side Cover Allen Hardware Set - Triumph 650 / 750 c.c. Motorcycles 1969 & up
7 reviews $22.86

British Standard Stainless Steel Top Motor Mounts / Head Steadies for unit Triumph Motorcycles
14 reviews $29.86

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

British Standard Triumph Cylinder Base Nut Set Unit 650cc 1969-1972 OEM # S692 21-0692
5 reviews $25.32

British Standard Pushrods for Triumph Bonneville 650 Motorcycles - Set of 4- OEM# 70-2620
2 reviews $95.08

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 Base Gasket with Impregnated Wire for Triumph Motorcycles OEM #70-6309
9 reviews $11.16

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

British Standard Rocker Cap/Valve Cover Set Triumph 350 500 650 Unit Twins
3 reviews $40.39

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

British Standard Triumph Patent Plate with Rivets
7 reviews $16.01

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

British Standard Timing Cover Gasket for unit Triumph Motorcycles OEM #71-7263
8 reviews $8.79

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

British Standard Rocker Cover Washers - 4 Pack - Triumph Unit 500 650
5 reviews $6.86

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

British Standard Triumph Oil Seal-Timing Cover Points Seal- OEM part# 70-4568
12 reviews $13.24

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

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

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

British Standard Inner Gearbox Gasket for Unit 650 and 750 Triumph Motorcycles OEM Part #57-7012 or 71-3096
6 reviews $6.77

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

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

British Standard OIF Sump Gasket Triumph T140 750 A65 TR6 TR7
1 review $5.78

British Standard Crankcase Oil Filter 1969-79 Triumph 650 750 T140 TR7 T120 TR6
3 reviews $58.73

British Standard Triumph Cylinder Base Nut Set Unit and Pre-Unit 650cc 1946-1968 OEM # P0172A 37-0076
5 reviews $22.67

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

British Standard Triumph 650 Head Bolt Set 1963 - 1970 OEM# 70-0327
8 reviews $95.14

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