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1983 honda shadow vt750c. not getting spark. power to coils. plugs are good. is there a way to bypass the cdi boxes so i don't have to use them

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Dis-connect the negative connection from the the top of the motor and check for corrosion. The bike with not fire if it isn't getting a good ground. I have a 1983 750 shadow would not start dumped a lot of parts into it before I found the corroded connection.

Posted on Apr 11, 2013

  • Shinnsplinter Jul 14, 2013

    where exactly is the connection? I haven't been able to find it on my 1983 Honda Shadow VT 750c. I have the same issue

  • hpatton975
    hpatton975 Jul 15, 2013

    The 1983 Shadows are known for wiring issues. Start from the
    positive battery terminal and trace the wire all the way to the starter. Check
    the main fuse, all connections for corrosion. Even a small amount can cause
    problems. Also check the yellow wires going to the stator. Also do a search for Shadow forums they are very helpful.


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Im getting the same issue ! no spark to any of the plugs, and all plugs are new, engine cranks but does not fire up!! :( it was running just a couple days ago! maybe need a stronger battery ???
(1983 honda vt 750 c shadow)

Posted on May 26, 2011

  • jeff malyan
    jeff malyan Feb 19, 2014

    check spark assist modules for damage / replace, check coils for power, then move on to the pulse generator sensors these are what create the spark by collapsing the coil fields. and of course make sure all frame grounds are nice and clean.



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the cdi box( capacitor discharge ignition) is what gives you the current that energizes the coil for the plugs
by pass it and there is little chance of it starting
best replace it with a new item and then chek the rest of the system for faults ,like coil, power to the box,problem in the distributor , cap,and any other item in the ignition circuit.

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Where is the cdi box located on 1983 honda shadow vt500

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Hi there I'm stuck I don't know how to check the

Sorry but they either work or they dont.
If yours isn't working, replace it.
But before you replce it consider checking the other components, because ign mods are exspensive.
it sounds like you've been already checking the other stuff. heres what i'd check if your bike came to my shop.
1. battery fully charged, and can take a load. (weak batteries = weak ign power)
i have a bike that won't fire at all with weak battery. Make sure battery is good.
2. check for spark at plugs, make sure plugs are good. Pull plugs and turn motor over.
rest plug next to head and turn over, do not touch the plug while turning over
or you can be shocked.look for spark.
if you have spark , then you ign mod is working.
if no spark, then check #3
3. power to coils. check the power going into coils,
if power but no spark, then coil is bad.
if no power. check #4
4. power to coils comes from a ignition system ( points/ cdi /ign. module)
there is a stator and a rotor. and a signal generator. on your motor
the signal generator wire sends a signal to the cdi, every time the rotor rotates.
the ignition system (ign.mod) sends power to coil.
so if no signal to the cdi, then signal generator is bad
if signal going into cdi but not sending the power to the coils then the cdi/ ign. mod is bad.

Hope that helps
Best Regards
Big Al

Jun 28, 2011 | 1995 Honda VT 600 C Shadow

1 Answer

The bike runs well but lacks power above 4000 rpm. what gives?

dirty air filter,fouled spark plugs, bad spark plug caps, weak coil, dirty high end circuit in carburetors, possible bad pulsar pick up or cdi box. start withe the least expensive fixes and work your way up. good luck

Apr 21, 2010 | 1984 Honda VT 500 C Shadow

1 Answer

1987 Honda shadow vt1100c no spark at any plug

The voltage on the coils is present except at the instant of firing. The interruption of the voltage is what causes the coil to fire. The cdi box is what causes the voltage interruption.
The interruption is very hard to detect. You are not the first to be stymied by that box. If you have access to an oscilloscope, I think you can see the pulse if it occurs.

Jun 07, 2009 | 1989 Honda VT 1100 C Shadow

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My 2004 Honda Shadow will not start. I have changed the spark plugs, wires, ingnition coils and now I'm left with the CDI module. The bike turns over but no spark. Is there a way to test it before I buy a...

I would get a test light and check if i had power to my coil and to my cdi module .You more than likely lost powerto one of them .those cdi last for every. check your switch make sure you got power there to. Hope this help

Feb 21, 2009 | 1989 Honda VT 1100 C Shadow

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