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Big Twin 4-Speed Primary Inner Bearings
This category encompasses ball and roller bearings located within the 4-speed gearbox, specifically designed for Harley-Davidson Big Twin engines. It includes precision bearings for the input, output, and intermediate shafts, ensuring efficient power transmission from the primary drive to the gears.
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Eastern MC PartsInner primary bearings for 4-speed Big Twin
Version: Para Big Twin 1970-principios 1984, Cojinete sellado, Eastern USA (OEM 9040)Main shaft bearings for the internal aluminium primary cover on 4-speed Big Twin 1965-early 1984 originally fitted with…
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ALL BALLSInner primary bearings for 4-speed Big Twin
Version: Para Big Twin 1970-principios 1984, Cojinete sellado, All Balls Racing (OEM 9040, 9061)Main shaft bearings for the internal aluminium primary cover on 4-speed Big Twin 1965-early 1984 originally fitted with…
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BELT DRIVES LTD.Inner primary bearings for 4-speed Big Twin
Version: Para Big Twin 1970-principios 1984, Cojinete sellado, Belt Drives Ltd. (OEM 9040, 9061)Main shaft bearings for the internal aluminium primary cover on 4-speed Big Twin 1965-early 1984 originally fitted with…
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Eastern MC PartsInner primary bearings for 4-speed Big Twin
Version: Para Big Twin 1965-1969, Rodamiento abierto, Eastern USA (OEM 9037)Main shaft bearings for the internal aluminium primary cover on 4-speed Big Twin 1965-early 1984 originally fitted with…
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DAYTONAInner primary bearings for 4-speed Big Twin
Version: Para Big Twin 1970-principios 1984, Cojinete sellado, Daytona Global (OEM 9040, 9061)Main shaft bearings for the internal aluminium primary cover on 4-speed Big Twin 1965-early 1984 originally fitted with…
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V-TwinInner primary bearings for 4-speed Big Twin
Version: Para Big Twin 1970-principios 1984, Cojinete sin sellar, V-Twin Mfg. (OEM 9061, 9040)Main shaft bearings for the internal aluminium primary cover on 4-speed Big Twin 1965-early 1984 originally fitted with…
About this category
Compatible with Evolution, Twin Cam, and Milwaukee Eight engines in Touring, Softail, Dyna, and Sportster models (depending on gearbox configuration). Essential for gearbox repairs, replacing worn bearings, or assembling high-performance transmissions. Manufactured from high-quality steel with appropriate sealing to prevent oil leaks and dirt contamination.