Baker Drivetrain 4 Speed Transmission Installation Instructions

Baker Drivetrain 4 Speed Transmission

Features

We understand the love affair with your vintage motorcycle, there’s nothing like putting authentic, vintage styled components on your nostalgic bike. That’s why BAKER has taken the time to reinvent the 4 Speed. A vintage styled BAKER cast aluminum (A356-T6) transmission case, designed for traditional gear drive speedo pick up and a modern late model electronic speedo pick up. Vintage style BAKER billet aluminum (6061-T6) top cover with linear detent system for that smooth reliable shift quality you have come to expect from BAKER. BAKER Klassic Kicker Gears come standard on kicker models; modern BAKER 4 Speed Gearset made out of high grade 8620 gear steel, all gears ride on needle bearings; no more brass bushings here. Direct bolt-in transmission for most applications.

Fitment

• 1936-E1984 FL^®/FX^® Shovelhead^®, Panhead^®, Knucklehead^®, Sturgis Shovelhead^®
• Custom Applications

Tool Requiered

• Torque Wrench (reads both in. lbs. and ft. lbs.)
• Common Hand Held Tools (Allen Wrenches, Sockets, Snap Ring Pliers, Etc.)
• Main Drive Gear & Bearing Service Tools
  • BAKER pn Tool A
  • H-D^® Equivalent pn 35316A
• Torque Wrench (reads both in. lbs. and ft. lbs.)
  • BAKER pn TOOL D
  • H-D^® Equivalent pn 94660-37B
• Fork Shifter Gauge
  • H-D^® P/N 96384-39
  • JIMS^® P/N 16-0641

Specifications

• TRANSMISSION FLUID CAPACITY: 22-24 fluid oz. BAKER Recommends: Spectro™ Heavy Duty Platinum 6 Speed Transmission Oil, pn BD-75140
• COUNTERSHAFT END PLAY: .007”-.012”
• 2^nd GEAR END PLAY: .003”-.010”
• 3^rd GEAR END PLAY: 003”-.010”
• 1 ^st/2^nd AND 3^rd/4^th SHIFT DOG TOOTH GAP: .060” per side
• SHIFT DRUM END PLAY: .0005”-.0065”
• RATCHET PAWL ADJUSTMENT: Per Your Factory Service Manual

Gear Ratios

Baker 4 Speed Drive Gear Ratios

Speedometer gear drive

BAKER 4 Speed Transmissions all come with a gear drive speedometer ring gear installed on the gearset. Using the list below; pending the year and model of you motorcycle you will have to use the following gear drive unit OEM part number or equivalent for your speedometer to function correctly.

1947-61 FL Models use a 2:1 Ratio Speedometer

1962-80 FL Models, 1971-72 FX Models and 1980-83 Models use a 1:1 Ratio Speedometer

BAKER 4-Speed part numbers and default speedometer gear drive configurations listed below unless specified by customer that they are using the 1962-67 ratio as specified above.

BAKER Default Speedometer configurations unless specified:

Electronic Speedometer Sensor Option

On 1965-E84 BAKER 4-Speed Transmission Cases (Ear Version Cases) you have the option to use a modern electronic speed senor. The transmission will house any Big Twin H-D^® style speed sensor from 1996-2006. For installation of the electric speed sensor see page 17.

• Speed Sensor, Electronic
  • H-D^® pn 74437-96
• Speedometer Recalibration Box
  • BAKER pn 95E-56B

Baker 4 Speed Torque Values

BAKER 4 SPEED EXPLODED VIEWS

Replica Cast and Chrome styled Kicker Covers

Figure 1

**** =Customer preference of cover style and finish

Ratchet Style Top Cover

Figure 2

*******= COMES WITH # 2

Jockey Style Top Cover

Figure 3

Shift Fork Components; 1965-E84 Case Shown

Figure 4

***= QUANTITY WILL VARY

+= WILL ONLY COME ON 1965-E84 TRANSMISSION CASES

Transmission Case and Gearset

Figure 5

*** = CUSTOMER PREFERENCE; DEPENDS ON YEAR AND FINISH

4+/- = WILL COME WITH CASE PN 120-4R / 120-4B / 120-4P ONLY

Transmission Gearset

Figure 6

******= MAINSHAFT PART NUMBERS: 149-4M/S (1970-E84 Splined M/S), 150-4M/S (1970-E84 Tapered M/S), 151-4M/S (1965-69 Tapered M/S), and 152-4M/S (1936-64 Tapered M/S)

---------= THRUST WASHER PART NUMBERS: 35883-36 (.095” Thick), 38582-36 (.090” Thick), and 38579-36 (.085” Thick)

BAKER DRIVETRAIN 4 SPEED SPEED SENSOR INSTRUCTIONS

INSTRUCTIONS

Install the transmission per you Factory Service Manual; before you install the starter (electric start applications only; 1965-UP). 1. With the Transmission in the bike frame and Inner Primary mounted; Install the electronic speed sensor. a. Remove the speed sensor plug on the transmission ear (rear left side of transmission). b. Lubricate the speed sensor O-Ring with transmission oil; install using Blue Loctite ® and torque the bolt to 110-120 in-lbs. 2. Fit up the starter to the primary with a couple bolts to hold it into position; do not tighten, you will notice if using a stock style starter that the housing of the starter will hit the top of the speed sensor. You will have to clearance the starter housing for proper fitment (figures 7 & 8). 3. Using a Sharpie® mark the area where the starter contacts the speed sensor. 4. Using a rat tail file or die grinder remove the material on the starter housing until the starter clears the speed sensor. You might have to do a couple checks and remark the starter to make sure that you are taking enough material for proper fitment (figure 8). You should have at least a 1/16” of clearance when done (figure 10). 5. After starter fits properly continue with your transmission installation per your Factory Service Manual	SHOWING FITMENT BEFORE MODIFICATION | FIGURE 7
	AREA OF CONCERN, BEFORE MODIFICATION | FIGURE 8
	STARTING TO TAKE MATERIAL OFF OF MARKED AREA | FIGURE 9
	STARTER INSTALLED AFTER MODIFICATION | FIGURE 10

BAKER DRIVETRAIN 4 SPEED – 1965-69 STOCK MODELS

INSTALLATION SUPPORT FOR 1965-69 BAKER 4 SPEEDS

BAKER 4 Speeds utilize an early 5 speed spline design for the main drive gear. Using this design requires a slightly offset sprocket to wrap around the modern spacer and drive gear. On 1965-69 models the stock inner primary has a lip which will hit the sprocket before going onto the transmission all of the way. Following these instructions and images, modify your stock H-D primary for proper fitment. These instructions do not apply for aftermarket inner primaries or belt drive motor plates. Modification of stock 65-69 inner primary Looking at figure 11 you can see the inner lip that has to be machined down in order to clear the sprocket and sprocket nut. Machine down this lip; measuring from the ears on the primary down; finish machine should be: .560” / .620” from the ear surface, figure 11. Notice that the threaded holes are now exposed on the casting from machining, figure 12. Chamfer the inner primary ears on the inside edge, breaking the edge .020/.030 X 45, figure 12.	STOCK 65 INNER | FIGURE 11
	MODIFIED 65 INNER | FIGURE 12
Make sure to test fit the primary onto the transmission before running. Extra machining clearance might be needed for proper fitment. After making sure everything fits properly, using four 1/4-20 X .375” set screws plug off the threaded holes. Apply some pipe thread sealant on the set screws then install from the inside, figure 13 Install the primary per your Factory Service Manual.	INSTALLING SET SCREWS | FIGURE 13