Instruction Manual

INSTALLATION FOR 8mm AND 11mm 4 AND 5 SPEED

DRIVES USING STOCK HD CLUTCH HUB AND CLUTCH

CLOSED PRIMARY AND 2in AND 3in OPEN DRIVES

1936-80 MODELS

Be sure to read the Warranty, Introduction, belt tracking and starter gear problems, alignment

procedure and disconnect battery.

CLOSED PRIMARY INSTALLATION:

1. Remove existing drive and inner primary per HD manual.

2. Relieve any casted bosses, ribs or areas that may come in contact with the front or rear

pulleys on both inner and/or outer primary covers.

3. Check engine seal for oil leaks and replace if necessary.

4. Make sure motor and transmission shafts are square and parallel with each other.

5. On earlier models shut off primary chain oiler screw. On later models remove primary

chain oil supply lines/vents and cap off fittings. NOTE: See OEM service manual for

proper vents/lines.

6. Install rear pulley with belt on clutch hub and install on transmission shaft, (refer to HD

manual). Install front pulley on engine shaft using belt guides supplied, spacing of the

front pulley may be necessary for proper alignment.

7. Rotate motor by hand using a socket wrench, the belt should track straight and away

from the motor.

8. For 11mm drives with idler, install plate and idler on existing serrated plate with idler

under belt, proper tension of belt is 1/2" total up and down on top of belt and 1/4" on

each side of idler.

9. Install clutch pack. (Refer to HD manual).

10. Install outer primary cover WITH gasket, tighten all bolts to HD specifications.

PAGE 1
INSTALLATION FOR 8mm AND 11mm 4 AND 5 SPEED DRIVES USING STOCK HD CLUTCH HUB AND CLUTCH CLOSED PRIMARY AND 2in AND 3in OPEN DRIVES 1936-80 MODELS Be sure to read the Warranty, Introduction, belt tracking and starter gear problems, alignment procedure and disconnect battery. CLOSED PRIMARY INSTALLATION: 1. Remove existing drive and inner primary per HD manual. 2. Relieve any casted bosses, ribs or areas that may come in contact with the front or rear pulleys on both inner and/or outer primary covers. 3.
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OPEN PRIMARY INSTALLATION: DISCONNECT BATTERY 1. Remove existing drive and remove inner and outer primary. 2. Install bearing support with bearing over transmission shaft and bolt to transmission. 3. Follow steps 3-7 and 9 above. 4. Replace or install all proper safety guards before operation of the vehicle.