Ignition module
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,925
Likes: 8,027
From: poway
Yes, it is a twin cam. It has an OEM Harley-Davidson coil. I confirmed it with its part no and on Ronnie's Parts List. The Harley service manual for my 2000 Softail states that the "normal resistance range is 5.5-7 Ohms" (page 8-70) for the secondary coil winding. The secondary windings are the towers where the spark plug wires are connected, not the primary posts, whose normal resistance range is from 0.5 to 0.7 Ohms.
You just stated that the your primary resistance was 3 ohms. ???? Like I wrote 0.5 is were is should be. The DTT works fine with a stock coil.
Normal resistance for the secondary is 5,500 to 7000 ohms. You read that wrong. Don't forget the reading glasses. I need them for sure..
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,925
Likes: 8,027
From: poway
From the instructions.
The TC88 is designed to be used with the H-D
OE coil. Twin Cam 88 engines require a coil with
primary resistance less than one ohm. All aftermarket
coils intended for Twin Cam 88 engine applications
have electrical output characteristics similar to the OE
coil and do not offer any particular advantage
The TC88 is designed to be used with the H-D
OE coil. Twin Cam 88 engines require a coil with
primary resistance less than one ohm. All aftermarket
coils intended for Twin Cam 88 engine applications
have electrical output characteristics similar to the OE
coil and do not offer any particular advantage
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Cruiser
Joined: Sep 2021
Posts: 109
Likes: 15
From: Beaumont
Update: I have now installed the Champion RA-6HC spark plugs, including a coil with primary resistance of 0.05 ohm. At this time I do not have the money to buy a DTT ignition module, so I played around with different settings on the Dynatek module. I ended up with it set at 40A. I don't know if that will fix the kick back I previously had when shutting down, but since it only happened intermittently, I have no way of knowing, and will have to wait and see.
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Cruiser
Joined: Sep 2021
Posts: 109
Likes: 15
From: Beaumont
Correct. I kept the spark plugs on my desk for several days, and kept checking the accuracy of my work on gapping them, and each time I got 0.035, and must have checked them at least five times each, so they are good in that respect. I also do not give it gas when I start it, however, the kick back occurs when I shut down the engine, not when I start it, so I do not believe that would contribute to it.
Cruiser
Joined: May 2012
Posts: 146
Likes: 13
From: Kingston, NH
id say a 113" is more than a mildly modified motor, at the very least this means it's had the case bored to accommodate that size. you ought to find out what cam is in that before you do much more. better yet, take it to a competent dyno operator.
also kickback sounds might be compensator or other primary issues, but the early compensators were usually pretty good and don't have issues like the later ones.
if it really is dieseling and trying to go backwards then either the ignition is bad or something else is wrong.
also kickback sounds might be compensator or other primary issues, but the early compensators were usually pretty good and don't have issues like the later ones.
if it really is dieseling and trying to go backwards then either the ignition is bad or something else is wrong.
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Cruiser
Joined: Sep 2021
Posts: 109
Likes: 15
From: Beaumont
As of today, I have shut it down some twenty times, and I have not had a single kick back so far. This is after I tried different settings on my Dynatek digital ignition module. If I recall, the advance had originally been set at 36B, and I moved it down to 32A, and then incrementally moved it up to 40A, where it is now, and it seems to run the best. Perhaps the advance was previously set too high, even though my bike would qualify as a highly modified bike and should have run well at 36B, which would usually require a more advanced curve. I was initially considering changing to a Daytona Twin Tec ignition module, but my Dynatek TC88-2P seems to have more varied tuning settings.
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