Question about 1984 Honda CBX 750 F

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Spark plugs 1 and 4 donĀ“t work

Where is cdi unit

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I have an '84 CBX 750 chain drive and the cdi is under the tank

Posted on Aug 11, 2009

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Ummm my 150 pulsar dtsi have got firing problem till now mechanics doesnot know where is the problem plzzz help me out


Hi, Surat and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and CDI box.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose, check for spark leakage in the dark.
6. Faulty ignition coil, pick up coil, trigger coil or CDI box testing needs to be checked with an ohmmeter at 70 degrees Fahrenheit
7. Faulty safety switches clutch, kickstand, neutral, off/on etc.
8. Faulty ignition switch.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Pulsar No spark on the right plug Team BHP
http://www.xbhp.com/talkies/help-me/25313-pulsar-180-not-starting.html
How to test motorcycle pickup coils
How to test motorcycle CDI box ignition coil
http://www.bcmtouring.com/imp/Pulsar_DTSi_Workshop_Manual.pdf

Aug 23, 2016 | Motorcycles

1 Answer

No spark from plug


Could be a wiring problem, Bad CDI unit, Bad Coil, Bad HT lead or a bad spark plug.. first thing to do is to take the spark plug cap off and hold the wire near the engine and see if a spark arcs onto the engine. if it does then its your spark plug or spark plug cap. If that doesnt work get a test lamp and check the voltage to the wire going into the coil, if it flashs the light then the coil is bad. If that doesnt work then it could be a wiring issue, so i would try unplugging the kill switch first. if that gives no joy then its a wire harness or CDI/ Magneto issue. So my next step would be to go to a salvage yard or mechanics with the bike and ask them to test the CDI (by using one they know is good or checking the wires).. they will tell you what the problem is from there. Tell them what you have done so far so they don't waste time.

Sep 09, 2012 | Motorcycles

1 Answer

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

Hi I do have a pulsar 180 2002 model now my CDi unit has some problem i changed to another CDI unit of 180DTSI but it's not working but when i enquired with the service team they are telling that...


Hi Anonymous, I am sorry you can't find the first and best tool you ever bought for your Bajaj but despair not for a mere $10 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day.
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Oct 11, 2010 | Bajaj Pulsar 180 Motorcycles

1 Answer

No spark on 1998 Cagiva Canyon


did you check the primary coil? the ignition coil?if you think that these are all good,then you must replace the CDI.You cant test a CDI if this is good or not because it is a form of IC or integrated circuit,unless you have a manufacturer's diagram of it.You can check it by by detaching into its plug and get and replace an old CDI which you know is working,for example,get the CDI of the other motorcycle (if it has)the try to plug-in ,and if it fires,then thre you can surely know that the problem is on the CDI.

Nov 17, 2009 | 1998 Cagiva Canyon 500

2 Answers

1975 Honda 500T runs but only on one cylinder. Any ideas why?


It could be a lot of different thing... compression in the cylinder could be too low to support proper combustion, it also could be electrical. If you don’t have compression gauges you cant really do that test yourself, but as far as the electrical goes I can help

First off you will need a water spray bottle, and a spark plug wrench/socket and any tools needed to remove the coils and inspect to see if they are still properly grounded (free of rust/corrosion, and any breaks in the wire or wires insulation)

First let the bike run for about 2-3 minutes to let the exhaust system heat up, the exhaust from the cylinder that is running should be allot hotter then the cylinder that isn’t (yes the none running cylinder is still hot due to heat transfer so don’t touch it!!!)
At this time spray a light mist of water on each of the exhaust in the same spot on the first bend of the exhaust you can reach closest to the cylinder (try not to spray cool water on the cylinder head, in theory it could heat stress, causing it to crack) You should be able to tell which exhaust is hotter by the rate of water evaporation, in turn telling your which cylinder is running

Once you’ve determined which cylinder is running or not for sure take the spark plug and coil's and switch them with the non running cylinder (its a good idea to ark them with a sharpie so they don’t get mixed up, while switching them inspect the coils and spark plugs as well as all grounds and wires for obvious signs of malfunction or breaks in wire insulation

Once you have swapped out the know good components from the running cylinder with the parts in question try to re-start the bike< If it starts let it run again for another 2-3 min and test to see which cylinder was running....

If the problem jumps cylinders you know its either the coil or spark plug...if both cylinders start up now...it was an improper or loss ground causing insufficient spark

If it stays in the same cylinder then depending weather you have an ecu or not, im not sure for that old of a bike, but you could check the pins at the ecu for corrosion and clean them......if not then your last option is to check the non running cylinder compression


Aug 19, 2009 | Honda CBF 500 Motorcycles

1 Answer

No spark


Check the side stand kill switch if your bike has one. It kills the engine so that you don’t start out with the side stand down. If broken or out of adjustment, it would kill the spark. Check for a broken wire at the side stand switch and coupler. Try moving the kill switch by hand. If that doesn’t work then wire a jumper around the switch to bypass it. Check the fuses. How good is the battery? Try a jump start from your car battery. Is the handlebar kill switch on? Check the operation of the ignition switch and all kill switches with a volt ohmmeter. Install new spark plug.

If that doesn't do it, check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? Is the bike in neutral and the neutral light is lit up? If no neutral light, check the neutral switch and neutral switch wire on center casing. If still no spark, get CDI system and coils checked at the dealers shop. You can screw up a CDI unit checking it yourself.

Jun 18, 2009 | Honda XR 200 Motorcycles

3 Answers

1986 gsxr 400.not sparking r starting


Hi and welcome to FixYa,

If somehow, the CDI could be opened up, then component level repair maybe tried. There would be 2 final transistors that actually do the switching; 1 for each coil. Offhand, it would appear that 1 of those 2 is faulty. Otherwise, replacement is the only option.

Incidentally, in some versions, a fault in the tachometer could also cause one of the CDI's output to fail.

Postback results of tests.

Good luck and thank you for using FixYa.

May 27, 2009 | 1996 Honda CBR 400 RR

1 Answer

Gsxr 750 no spark how do i test cdi


I've this data from my 1986 engine!

Under the left hand side cover there are 2 2-wire connections. One with a green and a black wire, one with a blue and a yellow wire.
Use an ohmmeter at R x 100 between both wires of a connector to check the pick-up coils: resistance must be between 130 and 180 Ohms.

The values of the ignition coil resistances are:
primary coil : 3-5ohms ( set ohmmeter at R x 1 )
Secundary coil : 25.000 - 45.000 ohms ( set ohmmeter at R x 1.000 )
For a correct measurement ALL leads must be disconnected ( also the spark plug leads )

The CDI cannot be tested with a simple measurement. Suzuki dealers have a special tool to test CDI boxes.
But checking the pick-up coils and ignition coils good will indicate an defective CDI.

The wires on the CDI:
Blue: PU coil 1 ( cyl 1-4 )
Yellow: PU coil 1
Green: PU coil 2 ( cyl 2-3 )
Blue : PU coil 2
Orange/white : +12v ign coil 1-4
White : switched coil negative side ign coil 1-4
Orange/white : +12v ign coil 2-3
Blue/yellow: switched coil negative side ign coil 1-4 ( and signal to tachometer )
Blue/white : ground

Thus, you must have +12V on both Orange/white leads.

Mar 15, 2009 | 1992 Suzuki GSX-R 750 WN

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