Motorcycle Transmissions & Parts
![Motorcycle Transmissions & Components](https://ic.motorcycleid.com/motorcycle/pages/transmissions-components/motorcycle-transmissions-components_collage_0.jpg)
- Cometic Gasket®Neutral Indicator Washer (C9497)Universal Neutral Indicator Washer by Cometic Gasket®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured...Designed to provide unrivaled value and maximum reliabilityExpertly crafted from the highest grade materials$10.60
- Cometic Gasket®Neutral Switch Indicator O-Ring (C9642)Neutral Switch Indicator O-Ring by Cometic Gasket®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Designed to provide unrivaled value and maximum reliabilityExpertly crafted from the highest grade materials$15.09
- Cometic Gasket®Oil Return O-Rings for Transmission Plug (C10212)Universal Oil Return O-Rings for Transmission Plug by Cometic Gasket®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....Designed to provide unrivaled value and maximum reliabilityExpertly crafted from the highest grade materials$10.77
- Cometic Gasket®Primary Cover Gasket (C9317F5)Universal Primary Cover Gasket (C9317F5) by Cometic Gasket®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....Expertly crafted from the highest grade materialsPrecise engineering ensures the latest in quality$117.90
- Cometic Gasket®Primary Cover Gasket (C9318F5)Universal Primary Cover Gasket (C9318F5) by Cometic Gasket®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....Expertly crafted from the highest grade materialsPrecise engineering ensures the latest in quality$147.72
- Cometic Gasket®Shifter Fork O-Ring Evo (C9510)Universal Shifter Fork O-Ring Evo by Cometic Gasket®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Designed to provide unrivaled value and maximum reliabilityExpertly crafted from the highest grade materials$8.29
- Cometic Gasket®Shifter Shaft Quad Seal (C9357)Universal Shifter Shaft Quad Seal by Cometic Gasket®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Designed to provide unrivaled value and maximum reliabilityExpertly crafted from the highest grade materials$15.03
- Cometic Gasket®Transmission Output Gear Oil Seal (C9200)Universal Transmission Output Gear Oil Seal by Cometic Gasket®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....Designed to provide unrivaled value and maximum reliabilityExpertly crafted from the highest grade materials$85.12
- Compu-Fire®8620 Hardened Steel Gear Set (54003)8620 Hardened Steel Gear Set by Compu-Fire®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Wicked style meets astounding performanceExcellent upgrade for die-hard performance fans$194.80
- Compu-Fire®8620 Hardened Steel Gear Set (54002)8620 Hardened Steel Gear Set by Compu-Fire®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Wicked style meets astounding performanceExcellent upgrade for die-hard performance fans$194.80
- Compu-Fire®Pinion Shaft (53507)Universal Pinion Shaft by Compu-Fire®. BDL Adapter Shaft for use with 3" BDL. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of...Wicked style meets astounding performanceExcellent upgrade for die-hard performance fans$117.47
- Eastern Performance®2nd Countershaft Gear Spacer (A-35809-58)2nd Countershaft Gear Spacer by Eastern Performance®. 5 Pieces. Eastern Performance® has a huge selection of the best motorcycle parts & accessories for your Harley Davidson Touring, Softail, Dyna, Sportster, and V-Rod models. With...Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$18.94
- Eastern Performance®4-Speed Main Drive Gear Spacer (A-35171-37)4-Speed Main Drive Gear Spacer (A-35171-37) by Eastern Performance®. 1 Piece. Eastern Performance® has a huge selection of the best motorcycle parts & accessories for your Harley Davidson Touring, Softail, Dyna, Sportster, and V-Rod...Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$30.15
- Eastern Performance®5-Speed Main Drive Gear Spacer (A-33334-85)5-Speed Main Drive Gear Spacer (A-33334-85) by Eastern Performance®. Precision spacers used between main drive gear and sprocket for belt drive Sportsters and Big Twin transmissions. Eastern Performance® has a huge selection of the...Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$21.25
- Eastern Performance®Countershaft End Plate (A-35630-36)Countershaft End Plate by Eastern Performance®. 1 Piece. Eastern Performance® has a huge selection of the best motorcycle parts & accessories for your Harley Davidson Touring, Softail, Dyna, Sportster, and V-Rod models. With over 20...Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$12.80
- Eastern Performance®Main Drive Gear Spacer (A-35070-77)Main Drive Gear Spacer (A-35070-77) by Eastern Performance®. 1 Piece. Eastern Performance® has a huge selection of the best motorcycle parts & accessories for your Harley Davidson Touring, Softail, Dyna, Sportster, and V-Rod models....Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$25.28
- Eastern Performance®Main Drive Gear Spacer (A-33344-94)Main Drive Gear Spacer (A-33344-94) by Eastern Performance®. 1 Piece. Eastern Performance® has a huge selection of the best motorcycle parts & accessories for your Harley Davidson Touring, Softail, Dyna, Sportster, and V-Rod models....Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$32.46
- Eastern Performance®Mainshaft Roller Bearings (A-9084-44)Mainshaft Roller Bearings by Eastern Performance®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Sold eachHigh-quality replacement for OEM NO. 98885$17.70
- Eastern Performance®Rivets for Kick Starter Ratchet (A-8216-100)Rivets for Kick Starter Ratchet by Eastern Performance®. 1 Piece. Eastern Performance® has a huge selection of the best motorcycle parts & accessories for your Harley Davidson Touring, Softail, Dyna, Sportster, and V-Rod models. With...Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$6.96
- Eastern Performance®Shifter Finger Rollers (A-34168-52)Shifter Finger Rollers (A-34168-52) by Eastern Performance®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....Rollers for shifter fingersReplaces OEM 34168-39$17.69
- Eastern Performance®Shifter Finger Rollers (A-34168-39)Shifter Finger Rollers (A-34168-39) by Eastern Performance®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....Rollers for shifter fingersReplaces OEM 34168-39$17.69
- Eastern Performance®Shifter Lever Springs (A-34087-79A)Shifter Lever Springs by Eastern Performance®. 5 Pieces. Eastern Performance® has a huge selection of the best motorcycle parts & accessories for your Harley Davidson Touring, Softail, Dyna, Sportster, and V-Rod models. With over 20...Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$18.31
- Eastern Performance®Shifter Pawl Carrier Spring (A-34500-52A)Shifter Pawl Carrier Spring by Eastern Performance®. 1 Piece. Eastern Performance® has a huge selection of the best motorcycle parts & accessories for your Harley Davidson Touring, Softail, Dyna, Sportster, and V-Rod models. With over...Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$10.12
- Eastern Performance®Shifter Shaft Lever Pin (A-34082-79)Shifter Shaft Lever Pin by Eastern Performance®. 5 Pieces. Eastern Performance® has a huge selection of the best motorcycle parts & accessories for your Harley Davidson Touring, Softail, Dyna, Sportster, and V-Rod models. With over 20...Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$18.94
- Eastern Performance®Transmission Drive Gear Spacer Woodruff Keys (A-35175-38)Transmission Drive Gear Spacer Woodruff Keys (A-35175-38) by Eastern Performance®. 10 Pieces. Eastern Performance® has a huge selection of the best motorcycle parts & accessories for your Harley Davidson Touring, Softail, Dyna,...Crafted with precision using leading innovationsDesigned specifically for Harley-Davidson motorcycles$14.64
- JIMS®4-Speed Transmission Rebuild Kit (33031-76L)4-Speed Transmission Rebuild Kit by JIMS®. Use JIMS® proven transmission parts to start with, then top it off with a JIMS® Gasket set, together in one convenient package. This is a big time saver. This top-grade product is expertly...Unique design to meet your tastes and preferencesManufactured to deliver incredible quality$234.32
- JIMS®4-Speed Transmission Rebuild Kit (33031-36)4-Speed Transmission Rebuild Kit by JIMS®. Use JIMS® proven transmission parts to start with, then top it off with a JIMS® Gasket set, together in one convenient package. This is a big time saver. This top-grade product is expertly...Unique design to meet your tastes and preferencesManufactured to deliver incredible quality$337.82
- JIMS®4-Speed Transmission Rebuild Kit (33031-80)4-Speed Transmission Rebuild Kit by JIMS®. Use JIMS® proven transmission parts to start with, then top it off with a JIMS® Gasket set, together in one convenient package. This is a big time saver. This top-grade product is expertly...Unique design to meet your tastes and preferencesManufactured to deliver incredible quality$234.32
- JIMS®5-Speed Billet Trap Door (2347-7B)5-Speed Billet Trap Door by JIMS®. Assemblies with exhaust mount for small bearing #8998. Polished trap door with installed bearings and retainers. All of JIMS® trap doors are designed to be used with the 100 HP+ High Performance...Unique design to meet your tastes and preferencesManufactured to deliver incredible quality$290.79
- JIMS®Complete Transmission Rebuild Kit (1056)Complete Transmission Rebuild Kit by JIMS®. If you've ever used any of JIMS rebuild kits in the past, then you know the convenience and time saved by ordering just one part number that comes with all the necessary gaskets, seals, locks...Unique design to meet your tastes and preferencesManufactured to deliver incredible quality$499.01
The majority of modern motorcycles use manual sequential gearboxes with five or six gears. “Sequential” means that the rider cannot select any gear any time. He or she has to pull up a shifting lever to select one gear higher or press it down to change gear from higher to lower in strict order. As standard, the shifting lever is positioned on the lower left side of the bike to be operated by the rider’s left foot. A clutch lever is located over the left grip so that the rider can operate the bike without taking his or her hand off the handlebars.
In a traditional “1 down 4 up” or “1 down 5 up” scheme, the neutral gear is positioned between the first and second gear because it makes the most sense. That way, by pushing the lever down several times, you know that you have reached the first gear and to put your bike in neutral, you have to pull the lever half a click up. From the neutral position, you can select the second gear when starting downhill. The construction of sequential motorcycle transmissions allows experienced riders to use the clutch only when starting from a complete stop while performing clutchless upshifting between higher gears.
Since the conventional manual gearbox with an H-pattern of shifting used in cars is too large to be fitted into a compact motorcycle frame, and shifting using hand lever on bikes is proved to be impractical, modern motorcycles use a compact “dog clutch” scheme where all of the gear teeth are always engaged. Some of the gears are connected to input and output shafts through splines but can shift from side to side. Some of them rotate freely. When the rider pushes the shift lever, it rotates the shift drum or barrel through a ratchet mechanism. The drum has grooves around its surface used to actuate shift forks.
As the drum rotates, these forks literally shift gears on transmission shafts to engage the needed gear pairs, thus the term ""shifting gears."" The engagement between freely rotating gears and those splined to the same shaft is performed through dog clutches. Some gears have pegs on their sides called “dogs.” They are designed to nest in corresponding recesses on adjacent sprockets. To complete the shift to an adjacent gear, you need to provide only a brief interruption of engine torque. A shift fork makes neighboring gears lock together and rotate as one. By pushing the shift lever up without clicking it, you can synchronize the rotation of two gears, which allows you to shift them after rolling off the throttle without disengaging the clutch and without causing damage to transmission components.
A smoothly running gearbox is essential for your success on the track or comfort on the road. If something goes wrong with the gears, you can tell with certainty that the problem is in the transmission. When it is time for repairs or upgrade, visit our online store and browse the catalog of motorcycle transmissions and components where we’ve gathered only high-quality products made by some of the most reputable manufacturers in the industry. We offer high-performance gearboxes with additional overdrive gears. Some models feature rear gears, which is convenient if you own a heavy cruiser. Here you can find rebuild kits, replacement shafts, gear, shift forks, drums, transmission covers, and much more.
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Drive Chains
Sprockets
Chain & Sprocket Kits
Drive Belts & Pulleys
Primary Chains & Belts
Clutches
Variators
Driveshaft
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Chain Guide, Protection & Sliders
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Chain & Belt Adjusters
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Transmission Sensors & Switches
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Transmission Gaskets, Seals & Bushings
Drivetrain & Transmission Bearings
Drivetrain & Transmission Mounts
Engine & Transmission Custom Covers
Drive Belt & Drive Shaft Covers
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