Twin Tec 1005 Installation Instructions Manual

Twin Tec
CAUTION: CAREFULLY READ INSTRUCTIONS BEFORE PROCEEDING. NOT LEGAL FOR SALE
OR USE IN CALIFORNIA OR ON ANY POLLUTION CONTROLLED VEHICLES.
OVERVIEW
Twin Tec ignition Model 1005 is intended for use

with Harley-Davidson Evolution
engines. The Model 1005 replaces the original
equipment (OE) electronic ignition system on 1978-99
models. The unit mounts in the gear case cover and

uses the standard H-D
used on earlier models with breaker points and
mechanical advance. Please note that the 1005S-EX is
recommended for 1998 and later Sportster
it mates directly with the OE wiring harness.
The Model 1005 offers adjustable advance,
adjustable RPM limit settings in 100 RPM increments,
and switch selectable single or dual fire modes. Single
fire mode improves starting, reduces the occurrence of
backfiring at low RPM, and improves power at high
RPM. A red status LED flashes when the engine
reaches top dead center (TDC) and allows easy static
timing. The status LED also provides diagnostic
information. A green VOES LED illuminates when the
VOES (vacuum switch) input is active.
A special feature allows use of the tachometer
wire for a PC link to a laptop computer when the
engine is not running. Individual units can be
programmed with a custom advance curve and other
engine parameters such as rear cylinder timing offset.
The use of the tachometer wire for the PC link
eliminates the need to remove the outer cover plate.
All Model 1005 units log engine operating data
that may be downloaded and viewed with our
Operating Statistics software. Model 1005 units
manufactured starting January, 2006 include a build-in
temperature sensor and logging of temperature data.
AVOIDING HEAT RELATED
FAILURES
Heat kills electronics. The Model 1005 uses
electronic devices rated for operation at 105 deg C
(221 deg F), the highest rating available. The unit can
tolerate somewhat higher temperatures, but exposure
to temperatures above 125 deg C (257 deg F) will
greatly reduce life expectancy. We sometimes see
problematic applications where several module failures
have occurred. The failure mode is a classic thermal
Daytona Twin Tec LLC, 933 Beville Road, Suite 101-H, S. Daytona, FL 32119
(386) 304-0700 www.daytona-twintec.com

type motorcycle
timing rotor. It can also be

models as
Installation Instructions
for Ignition Model 1005
intermittent where the module stops firing one cylinder
when it gets hot. We have found that these problematic
applications share one or more of the following
characteristics:

VOES switch removed or non-functional. All street
driven engines require vacuum advance. Without
vacuum advance at idle and part throttle,
thermodynamic efficiency is reduced and engine
temperatures increase significantly.

Improper carburetor jetting resulting in lean air/fuel
ratio (AFR). A lean AFR will cause the engine to
run very hot. All performance engine modifications
necessitate carburetor rejetting. Carburetors are
never correctly jetted out-of-the-box. The only
practical means of correctly jetting a carburetor is
to test the motorcycle on a chassis dyno equipped
with an exhaust gas sniffer or to use our WEGO
system.

Lack of an oil cooler on a 95 CID or larger engine.

Exhaust pipe without heat shield in close proximity
to the nose cone.
If any of the above applies to your application,
the Model 1005 may be exposed to excessive
temperatures resulting in reduced life expectancy. Use
an infrared thermometer to check the module
temperature. Can you also our Operating Statistics
software to monitor temperature levels. If excessive
temperatures are encountered and cannot be
remedied, you should consider using an external
module such as our Model 1006 or 1007.
INCLUDED AND ADDITIONAL
REQUIRED PARTS
All units include a parts bag with crimp terminals
for coil and VOES hookup and a Packard Weather
Pack connector set intended for installation on the
tachometer wire to provide an access point for the PC
link.
FL series Big-Twin
to 1985, FX series Big-Twin
models manufactured prior to 1984, all Sportster
1200S models, and all models with original equipment
Page 1

models manufactured prior

and XL Series Sportster

Model 1005
5/2015
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