To specify ‘no ear’ for other base part numbers add suffix ‘NE’ All other base part numbers come standard with ‘ear’ cases. 4-3664 comes standard with a ‘no ear’ case for tin primary compatibility.Default shifter lid is Ratchet Top Style for all part numbers.BAKER offers the Shovel Clutch, for more information on the clutch click the image below. Part number 4-7090 comes with a splined mainshaft, you must convert to a splined diaphragm style clutch.Yearġ947-61 FL Models use a 2:1 Ratio Speedometerġ962-80 FL Models, 1971-72 FX Models and 1980-83 Models use a 1:1 Ratio SpeedometerīAKER 4-Speed part numbers and default speedometer gear drive configurations unless specified by customer that they are using the 1962-67 ratio as specified above. Using the list below pending the year and model of your motorcycle you will have to use the following gear drive unit OEM part number or equivalent for your speedometer to function correctly. Pending what type of electronic speedometer you use, an additional speedometer recalibration box might have to be purchased, BAKER PN 95E-56B.Īll BAKER 4-Speed gearsets come with the gear drive ring installed. The electronic speedometer would utilize a stock 1996-2006 speed sensor, PN 74437-96. By tucking the electronic speedometer provision mount by the ear you can conceal any modern components keeping your bike looking stock. Both cases have the option to use the speedo gear drive location but we also molded an electronic speedometer mounting boss to follow the ear on our 1965-E84 case only. Our 1936-64 case is a no ear case which utilizes the stock style speedo gear drive while our 1965-E84 is an ear case.
The 4-Speed Transmission case was modeled after the factory 19 cases to capture all the details and character, but we made some modern improvements as well. All bronze bushings were replaced with modern low friction bearings. We added lead-in helical ramps on the shift clutches to improve shift quality. The designers of this transmission back in the '30s would be envious of the improvements we made to their design with modern manufacturing processes. Take off the shifter lid on our 4-speeds and turn the shafts you will hear silence because the involute profiles are perfect. Gear tooth profiles are ground and finished with diamond tooling after heat treat to correct the tooth distortion that naturally occurs when you put a chunk of steel in a very hot furnace. Vacuum carburized heat treat gives a case hardness of 58-62 Rockwell ‘C’. 4-speed gears and shafts are manufactured with 8620 steel.
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