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Sportster Motorcycle Drag Racing Discuss drag racing on a Sportster Motorcycle.

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  #1  
Old 12th July 2022
ftwflh ftwflh is offline
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Default 2step rev limiter

Has anyone put a Dynatek 400-HD on a 1200S Sportsers with the stock ignition system with a 7500 rev limit SE ignition module?
After going with wheelie bars I find I am not coordinated enough to watch my tach and the lights at the same time to launch at the rpm I need to.
If you have ran one of these on a 1200S send me pics of how it is done and how to wire in a clutch switch.
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  #2  
Old 13th July 2022
Racepres Racepres is offline
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I do Not think that limiter is gonna fly with Single Fire...
Easy way is an old MSD MC-1 or MC-2... work wonderful...and the Low limit is applied Ground... Very simple... Downside... that is a Big Assed Box...
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  #3  
Old 14th July 2022
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cycowrencher cycowrencher is offline
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Default

The 400hd I have will work with both. It interrupts the ground not the hot.

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  #4  
Old 15th July 2022
Racepres Racepres is offline
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Quote:
Originally Posted by cycowrencher View Post
The 400hd I have will work with both. It interrupts the ground not the hot.

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The MSD needs to use the Hot, as it "controls" both sides of the Coil(s)
the ground applied wire, controls the launch (low) limit.
Again, due to sheer Size... I would have used almost any system that worked, yet be smaller.. Could be the 400HD is the ticket.. IDK
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