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Old 02-02-2010, 08:40 PM   #1 (permalink)
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Question CDI or Regulator

ok. this sounds stupid. but its bugging me. i know the CDI box is up front beneath the hood on my 400ex. and there is the regulator in the back by the air box. What does that do??? and whats the difference between the two??? Red, you should be able to help me on this one. you know your stuff.
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Old 02-02-2010, 08:46 PM   #2 (permalink)
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The one under the hood is the ICM Thats what my Honda manual says.
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Last edited by mud99; 02-02-2010 at 09:19 PM.
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Old 02-02-2010, 09:14 PM   #3 (permalink)
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CDI is your ignition. It takes the place of breaker points like were used in older ignition systems, except it's solid state and has no moving parts.

Regulator is the regulator/rectifier. It converts the AC power that your stator coils puts out to DC power and it also regulates the voltage to keep the battery from overcharging. It will be the one with the cooling fins on it.

Last edited by Helmut; 02-02-2010 at 09:22 PM. Reason: Misspelled fins.
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Old 02-02-2010, 09:17 PM   #4 (permalink)
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The regulator rectifier is a combined unit. It does the rectifying part as well the regulation part. It is part of a battery charging system. It gets a power feed, an AC power feed from the stator. Most of these regulator rectifiers and Stators are 3-Phase, for charging batteries, so there are three wires coming from the stator feeding into the regulator rectifier. Then the regulator rectifier rectifies it, and regulates the power to 14.5 volts and feeds a DC out to the battery. There are some single phase, regulator rectifiers as well that basically do the same thing. You have two wires coming from the stator, feeding into the regulator rectifier which is then connected up to the battery, so there is a DC output going to the battery.

A CDI is short for Capacitor Discharge Ignition. A CDI is an electronic ignition that uses a capacitor to store energy to which then gets discharged through the ignition coil. The advantage of a CDI is that the spark energy is very high, you get a very powerful spark, and very high voltage.
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Old 02-02-2010, 09:22 PM   #5 (permalink)
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Bravo, very well said Professor Redracer!!
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Old 02-02-2010, 09:25 PM   #6 (permalink)
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You're making me blush...
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Old 02-03-2010, 03:42 PM   #7 (permalink)
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So which one would i chance to get higher rpms??? the CDI?
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Old 02-03-2010, 03:53 PM   #8 (permalink)
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Yeah, aftermarket CDI will do away with rev limiter and change your timing curve.
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Old 02-03-2010, 03:54 PM   #9 (permalink)
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The CDI you willl roughly gain about a grand on RPMs usually? right professor RED!!
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Old 02-03-2010, 05:26 PM   #10 (permalink)
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Great info Helmut and Redracer!!!
Thumbs up to you both!!!!!!!!!!!!!!
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