Do engine mounts affect motorcycle performance?

Yes. Worn motorcycle engine mounts can allow excessive vibration to transfer through the chassis, negatively affecting handling and accelerating wear on seals, drivetrain connections, exhaust joints, and air cleaner mounts. An engine that moves excessively under load places additional stress on surrounding components. Keeping engine mounts in proper condition helps maintain overall drivetrain performance and reliability.

Can a bad engine mount damage the transmission?

Yes. Because the engine and transmission are connected through shafts and seals, excessive engine movement caused by a failed mount can create repeated lateral stress on these components. A transmission seal that continues to leak may indicate an engine mount issue that should be inspected before replacing additional parts.

What material should motorcycle engine mounts be made from?

Steel is generally the preferred material for high-vibration motorcycles such as Harley-Davidson V-twins. Compared to aluminum, steel offers greater long-term durability under constant vibration and load cycles. A quality steel engine mount that is properly installed and torqued to specification can provide significantly longer service life on motorcycles that are ridden regularly.

How often should I inspect my motorcycle engine mounts?

Inspect motorcycle engine mounts every three to four months under normal riding conditions, and always after extended trips or periods of hard use. Look for cracks in the mount body, loose fasteners, and any visible engine movement relative to the frame. Early detection of a failing mount can help prevent costly secondary damage to drivetrain and chassis components.

Motorcycle Engine Mounts

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Colony #8870-21 Lower Motor Mount Kit Acorn Head 1986-1992 Harley-Davidson Sportster - Chrome Plated
$33.67

Colony #9936-28 Front Motor Mount Kit Acorn 1991-Up Harley-Davidson Dyna - Chrome Plated
$36.20

Colony #9780-5 Top Motor Mount Hardware Kit 1932-Up Harley-Davidson 45's - CAD Plated
$10.37

Colony #2485-22 Motor Mounting Kit Upper and Lower Hex 2007-Up Harley-Davidson - Chrome Plated
$50.60

Colony #2403-22 Motor Mounting Kit Upper and Lower Allen 2007-Up Harley-Davidson - Chrome Plated
$50.60

Colony #2403-22-P Upper and Lower Motor Mounting Kit Smooth Allen 2007-2008 Harley-Davidson FLT - Chrome Plated
$56.93

Colony #2854-6 Upper Engine Allen Mounting Kit 1984-1999 Harley-Davidson Softail - Chrome Plated
$13.92

Colony #2709-24 Motor Mounting Kit Upper and Lower Allen 2009-Up Harley-Davidson FLT - Chrome Plated
$31.90

Colony #2648-9 Top Motor Mount Hardware Kit 1936-1947 Harley-Davidson Big Twin - CAD Plated
$15.13

Colony #2578-4 Top Motor Mount Hardware Kit 1948-1951 Harley-Davidson Big Twins - Parkerized
$11.20

Colony #3035-5 Top Motor Mount Hardware 1932-Up Harley-Davidson 45s - Parkerized
$10.37

Colony #9927-28-P Upper and Lower Motor Mount Kit Smooth Allen 1984-1999 Harley-Davidson Softail - Chrome Plated
$53.58

Colony #2709-24-P Upper and Lower Motor Mount Kit Smooth Allen 2009-Up Harley-Davidson FLT - Chrome Plated
$36.30

Colony #9935-8-P Transmission to Motor Mount Kit Smooth Allen 1999-2006 Harley-Davidson Twin Cam - Chrome Plated
$14.34

Colony #2994-8-P Center Motor Mount Kit Smooth Allen 1992 Harley-Davidson Sportster - Chrome Plated
$13.02

Colony #2993-8-P Center Motor Mount Kit Smooth Allen 1986-1990 Harley-Davidson Sportster - Chrome Plated
$13.02

Colony #2468-8-P Transmission to Motor Mount Smooth Allen Kit 2007-Up Harley-Davidson Softail/Dyna/FLT - Chrome Plated
$14.34

Colony #2229-16 Motor Mount Kit Acorn 2004-Up Harley-Davidson Sportster - Chrome Plated
$55.28

Colony #3441-13 Motor Mounting Kit 2017-Up Harley-Davidson Touring Models - Chrome Plated
$24.88

Colony #3440-12 Motor Case Mounting Kit 2017-Up Harley-Davidson Touring Models - Chrome Plated
$45.01

Gasbox Strong Arm Top Motor Mount - 1984-1999 Harley-Davidson Big Twin Evolution
$74.95

Cycle Standard Isolator Motor Mount - Rear - 1991-1998 Harley-Davidson Dyna
$109.89

Cycle Standard Engine Stabilizer Link - Chrome - 1995-2017 Harley-Davidson Dyna
$101.74

Colony #3058-10 Rear Motor Mount & Sprocket Cover Mounting Kit 1983-1985 Harley-Davidson XL - Zinc Plated
$27.50

Colony #3033-2 Rear Motor Mount Nut Kit 1962-1978 Harley-Davidson XL/XLH/XLCH
1 review $19.36

Colony #3690-16 Plain Head Lower Motor Mount Kit 1936-1957 Harley-Davidson OHV Big Twins - Parkerized
$40.70

Colony #3687-15 Lower Motor Mount Kit 1937-1947 Harley-Davidson Side Valve Big Twins - Parkerized
$39.88

Colony #3682-16 Lower Motor Mount Kit 1958-1965 Harley-Davidson OHV Big Twins - Chrome Plated
$33.55

Colony #3681-16 Lower Motor Mount Kit 1958-1965 Harley-Davidson OHV Big Twins - Parkerized
$30.80

Colony #3680-16 Lower Motor Mount Kit 1936-1957 Harley-Davidson OHV Big Twins - CAD Plated
$40.70

Colony #3679-16 Lower Motor Mount Kit 1936-1957 Harley-Davidson OHV Big Twins - Chrome Plated
$44.28

Colony #3678-16 Lower Motor Mount Kit 1936-1957 Harley-Davidson OHV Big Twins - Parkerized
$40.70

Colony #3125-14 Motor Mounting Kit 2017-Up Harley-Davidson Touring Models - Chrome Plated
$20.57

Cycle Standard Rear Motor Engine Mount 1967-1981 Harley Davidson Ironhead Sportster OEM #16203-67
4 reviews $102.21

Gasbox Front Motor Mount Plates for 1957 - 1981 Harley-Davidson Ironhead Sportster
6 reviews $29.95

Gasbox Oil Filter Front Motor Mount Plates for 1957 - 1981 Harley-Davidson Ironhead Sportster
4 reviews $49.95

Colony #2325-3 Oil Pump Plug Kit CAD 1952-54 Harley Davidson K KH — Colony #2325-3 Oil Pump Plug Kit 1952-1954 Harley-Davidson K/KH - CAD Plated
1 review $23.93

Colony #3036-22 Upper and Lower Motor Mount Kit 1937-1947 Harley-Davidson Big Twin Side Valve - Parkerized
1 review $43.82

Colony #9723-22 Upper and Lower Motor Mount Kit 1937-1947 Harley-Davidson Big Twin Side Valve - Parkerized
$43.82

Colony #2994-8 Allen Center Motor Mount Kit 1992 Harley-Davidson Sportster - Chrome Plated
$11.90

Colony #2993-8 Allen Center Motor Mount Kit 1986-1990 Harley-Davidson Sportster - Chrome Plated
$11.90

Colony #9937-20-P Front Motor Mount Kit Smooth Chrome Allen Harley Dyna 91-up — Colony #9937-20-P Front Motor Mount Smooth Allen Kit 1991-Up Harley-Davidson Dyna - Chrome Plated
1 review $20.27

Colony #2854-6-P Upper Engine Mounting Kit 1984-1999 Harley-Davidson Softail - Chrome Plated
2 reviews $14.52

Colony #2468-8-P Transmission to Motor Mount Smooth Allen Bolt Kit 2007-Up Harley-Davidson Softail/Dyna/FLT - Chrome Plated
$11.14

Colony #9928-20-P Motor Mounting Smooth Allen Kit 1988-2006 Harley-Davidson FLT/FLHT/FXR/FXRS - Chrome Plated
$49.25

Colony #9797-20-P Front Motor Mount Smooth Allen Kit 1957-1985 Harley-Davidson Ironhead Sportster - Chrome Plated
2 reviews $60.83

Colony #9772-22-P Lower Motor Mount Smooth Allen Kit 1986-1998 Harley-Davidson Sportster - Chrome Plated
1 review $35.87

Colony #2853-6 Upper Engine Mounting Kit 1984-1999 Harley-Davidson Softail - Zinc Plated
1 review $12.71

Colony #2313-19 Upper and Lower Motor Mount Bolt Kit 1936-1969 Harley-Davidson Big Twin - Parkerized
2 reviews $52.45

Colony #2228-16 Motor Mount Button Allen Kit 2000-Up Harley-Davidson Sportster - Chrome Plated
$33.84

British Standard Engine and Transmission Lock Tab Set - 1963 - 1972 Triumph 650 with 4 Speed Gearbox
14 reviews $25.25

Colony #9926-17 Upper & Lower Motor Mounting Allen Kit 1970-1984 Harley-Davidson Big Twin - Chrome Plated
$39.11

Colony #2116-15 Lower Front Hex Head Motor Mount Kit 2000-Up Harley-Davidson Softail - Chrome Plated
1 review $58.20

Colony #9937-20 Front Motor Mount Allen Kit 1991-Up Harley-Davidson Dyna - Chrome Plated
1 review $18.34

Colony #9854-28 Upper & Lower Motor Mount Kit 1984-1999 Harley-Davidson Softail - Chrome Plated
2 reviews $49.25

Colony #9798-20 Front Motor Mount Kit Stock 1957-1984 Harley-Davidson Sportster - Chrome Plated
2 reviews $47.38

Colony #9521-22 Upper & Lower Motor Mount Kit 1937-1947 Harley-Davidson Big Twin Side Valve - Chrome Plated
$47.80

Colony #9859-20 Lower Motor Mount Kit 1988-2006 Harley-Davidson FLT/FLHT/FXR/FXRS - Chrome Plated
1 review $44.89

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

Colony #9855-28 Upper & Lower Motor Mount Kit 1984-1999 Harley-Davidson Softail - Zinc Plated
2 reviews $42.00

Colony #9625-16 Lower Motor Mount Kit 1930-1936 Harley-Davidson VL All 45 's - Chrome Plated
$38.73

Colony #9860-20 Lower Motor Mount Kit 1988-2006 Harley-Davidson FLT/FLHT/FXR/FXRS
$36.94

Colony #9773-8 Center Motor Mount Kit Acorn Nut 1986-2003 Harley-Davidson Sportster - Chrome Plated
$16.73

Colony #8871-13 Upper Motor Mount Kit Acorn Head 1986-Up Harley-Davidson Sportster - Chrome Plated
$20.27

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

Colony #8164-19 Upper And Lower Motor Mount Kit 1936-1969 Harley-Davidson Big Twin OHV - Chrome Plated
5 reviews $57.53

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

Colony #7141-18 Front Motor Mount Kit with Heat Treated Studs - 1957-85 Harley-Davidson Sportster - Chrome Plated
1 review $50.69

Colony #7408-10 Over Length Front Motor Mount Studs With Acorn Nuts 1957-1985 Sportster - Chrome Plated
3 reviews $21.12

Gasbox Top Motor Mount - 2007-up Harley-Davidson Sportster - With EFI Coil and Stock Ignition Switch Mounts
11 reviews $49.95

MOTORCYCLE ENGINE MOUNTS FOR HARLEY, TRIUMPH, AND CUSTOM BUILDS A failing engine mount is not a minor inconvenience. On a Harley-Davidson Sportster or Big Twin, the engine vibration is constant and significant. A cracked or worn mount lets that vi...

MOTORCYCLE ENGINE MOUNTS FOR HARLEY, TRIUMPH, AND CUSTOM BUILDS

A failing engine mount is not a minor inconvenience. On a Harley-Davidson Sportster or Big Twin, the engine vibration is constant and significant. A cracked or worn mount lets that vibration transfer directly into the frame, stressing exhaust connections, loosening fasteners, and accelerating wear on transmission seals. Replacing a damaged mount early costs far less than dealing with what a loose engine does to the rest of the drivetrain over time.

HOW TO SPOT ENGINE MOUNT PROBLEMS

Catch issues before they compound:

Excessive Vibration at Idle: More vibration than usual at low rpm is one of the first signs a sportster motor mount is cracking or has lost its structural integrity. If the bike shakes harder than it used to at a stoplight, check the mounts before the next ride.
Clunking or Movement Under Load: A loose engine that shifts under acceleration or deceleration points to a failed mount or hardware. Movement in the motor relative to the frame puts immediate stress on every connected component.
Visual Cracks or Worn Hardware: Inspect mounts every few months, especially after long rides. Look for cracks in the mount body, worn rubber isolators where applicable, and any fasteners that have backed out of spec.
Transmission Seal Leaks: A transmission seal that keeps leaking despite replacement is a common secondary symptom of a failing motor mount. Excessive engine movement stresses the seal interface on every ride.

WHAT WE STOCK

Harley Davidson engine mount kits, standalone mounts, and all the hardware needed for a complete install:

Gasbox Engine Mount Kits: Gasbox motor mount kits include high-grade bolts and hardware for a complete replacement rather than a partial fix. Built specifically for custom and chopper applications.
Steel Mounts: Steel motorcycle motor mounts outlast aluminum equivalents on high-vibration platforms. A softer material like aluminum will eventually fatigue under the constant load cycle of a V-twin engine.
Coil and Switch Mounts: Some custom motor mounts include integrated mounting provisions for an ignition coil or ignition switch, keeping the cockpit clean without additional brackets.
Triumph and Multi-Platform Fitment: Vintage Triumph motorcycle mounts are stocked alongside Harley-Davidson applications. Check the product listing for year and model fitment before ordering.

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Motorcycle Engine Mounts FAQ

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