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VRXSE LAUNCH BOX CONNECTION KIT
J048362008-09-29
GENERAL
Kit Number
72333-08
Models
This kit is for VRXSE drag racing motorcycles.
Additional Parts Required
The DRL-400-HD launch box two stage rev limiter is purchased separately from DYNATEK and other aftermarket suppliers.
NOTE
This instruction sheet references service manual information. A service manual for your model motorcycle is required for this installation and is available from a Harley-Davidson dealer.
Kit Contents
Table 1. Connection Kit
Item
Description (Quantity)
Part Number
1
12 pin connector
74119-98BK
2
Terminal (7)
74191-98
3
Secondary lock
74159-98
4
Seal pin (5)
74195-98
REMOVAL
WARNING
To prevent accidental vehicle start-up, which could cause death or serious injury, remove main fuse before proceeding. (00251b)
  1. Remove main fuse.
  2. Remove radiator shrouding per procedure in service manual.
  3. Disconnect wiring harness from existing launch box.
  4. Remove fasteners from launch box.
  5. Remove launch box from mounting location.
INSTALLATION
NOTE
The DRL-400-HD launch box is a microprocessor based system that requires you to use carbon core type suppression spark plug wires with a resistance of at least 3000 ohms per foot to reduce radio frequency interference caused by ignition sparks. Use of copper or spiral core wires may cause malfunction of this rev limiter due to severe electrical noise.
  1. Refer to the service manual to install the launch box wires to the socket connector. Refer to Figure 1 for the following steps.
    1. Connect a jumper wire from #1 to #5 cavity.
    2. Connect a jumper wire from #5 to #6 cavity.
    3. Connect the red wire from the launch box to the #2 cavity of the socket connector.
    4. Connect the white wire to the #7 cavity.
    5. Connect the blue wire to the #9 cavity.
    6. Connect the black wire to the #11 cavity.
  2. Mount the DYNATEK launch box in the same location as the previous launch box using hook and loop fasteners or adhesive pads.
  3. Connect the launch box connector to the connector on the motorcycle.
Adjustment
  1. The high limit (over-rev) is adjusted with the 16-position rotary switch on the top of the launch box. The high limit range is 5,500-9,250 rpm. The switch range is adjustable in 250 rpm increments. The low limit rotary switch adjustment is not used.
LED Indicator
  1. A red LED is located on the top of the launch box. This LED has two functions. First, with the power on and the engine NOT running the LED functions as a clutch lever position indicator. The LED should come on when the clutch lever is pushed in (clutch switch closed). This feature can help diagnose a faulty or intermittent clutch switch wiring and aid in clutch switch adjustment. Second, with the engine running the LED indicates when the unit is limiting ignition pulses. In this mode the LED should only come on at the rpm indicated by the switch settings. If the LED comes on at any other rpm, the unit is being false triggered and may cause the engine to miss. The most common cause of false triggering is excessive electrical noise. Be sure that carbon core suppression spark plug wires are used.
Using the Launch Box
  1. When the clutch lever is pulled in, the launch limit of the launch box should be active. When the clutch lever is released, the high limit should be active. Clean, consistent launches can be attained by using the launch limit to hold the engine rpm at a consistent level while holding the throttle wide open at the starting line. When the clutch lever is released the engine will be allowed to rev freely while the clutch is engaging. This will allow you to launch the same way every time. Experience will help to determine the correct launch rpm for a particular motorcycle.
Wiring Diagram
Figure 1. Launch Box Wiring Diagram