Question about 1984 Honda CB 700 SC Nighthawk

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I only have spark on too cyls and i checked the coils and thay have same rezistents and power do you have info on how to check cdi unit and crank triggers thankyou

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Clymer manual!

Posted on Sep 15, 2010


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Yamaha G1 Golf cart...Engine does not crank when key is on and gas pedal is depressed... suggestion??.. I've heard that the CDI might be the issue...Discontinued part?

cranking is turning over which indicates that the battery and starter is doing the job
cranking but not firing indicates ignition or fuel problems
now that you have the correct terminology perhaps you can get an answer
first test is to pull a plug ground it out or use a spark plug tester crank it over to see if there is spark
Good spark forget CDI and coil so look at fuel
NO spark indicated , check for 12 volts from the ignition switch on the start circuit
Ignition switches have to power wires to the coil
on gives power when cranking and the other continues power when the starter is nor engaged
power in both positions move on to next check
no power from the switch to the coil when cranking --get new switch next check if both wires have 12 volts is the ignition circuit
check for safety micro switches not working right up to the CDI
power to the CDI but no spark --replace cdi
power from the cdi nut still no spark --replace the coil
AS to not available
check after marker as the units are generic and made by electronic companies not golf cart manufacturers so it is a distinct possibility that a cdi from some where else will fit

Feb 08, 2018 | Yamaha Motorcycles

1 Answer

Yamaha600 no spark is this a common part that goes and what would it be

Could be a few things, spark plug, coil, coil lead, wiring, cdi unit, check the wiring first for damage or disconnect wires, nextcheck voltage with volt meter when cranking engine (ignition on) if no voltage then the cdi unit needs replacing, could even be your ignition switch, a volt meter will tell you everything and find the fault

Feb 16, 2015 | Goes Motorcycles

1 Answer

Suzuki street magic spark issue

First change spark plug. If not plug, check plug cap, unscrew it off lead and hold lead end to cyl head and crank. If it sparks, change cap. If not, check H.T coil, C.D.I. and stator coils.

Apr 24, 2014 | 2005 Suzuki Street Magic II

1 Answer

Yamaha 25 nmo

The power supply is common for all the coils.
Have you switched the coils (wires marked 1 and 2)? If still the same coil non sparking, replace that coil.
If the same output non sparking, check the pulser coil for that cylinder. Invert both pulser coil connections (white red and white black). If the miss is on the same cilinder, replace the cdi. If the miss is on the other cylinder: replace that pulser coil.

Jun 10, 2013 | Clymer Boating

1 Answer

Gp 800 will crank but wont start

Hi, most likely the trigger coils near the flywheel, it will still have spark but the timing may be off. Try new plugs first as they may have spark outside the cylinders but not when under compression. Regards Phil

Jul 01, 2012 | Yamaha Boating

1 Answer

No spark

Try new spark plug
If still no go, check power to coil when cranking. If none then check fuses / trace witing into magneto. If all else fails may me CDI unit, get bike shop to test.

Mar 05, 2010 | 2000 Buell M2 Cyclone

2 Answers

No spark

Hi and welcome to FixYa,

To my understanding, the problem is 'no spark' yet the engine cranks. Generally, to consider are:
  • pulser coil (least likely);
  • ignition coil (likely);
  • interlocks (likely);
  • CDI (most likely).

Offhand, the CDI would be the main suspect. Since the CDI is sealed, it is not possible to do component level checks. The only way to check if the CDI is good is to check the external connections; if they are good and yet no spark, then the CDI is bad.

How to check the above:
  • to check the pulser coil, measure the low voltage coming from it using an analog/needle type AC voltmeter. While cranking, it should show a flickering low voltage;
  • to check the ignition coil, use a continuity tester. Primary should measure 3 ~ 5 ohms while primary to the high voltage end would measure 15 ~ 18 kilo ohms;
  • the ignition coil has 1 terminal connected to the IGN +12 while the other terminal is connected to the CDI. This should have a pulsating voltage when cranking.
  • all the interlocks could be checked with a continuity tester. Please note that most interlocks has a diode connected in series with their wires.
The interlocks include:
  • clutch switch;
  • side stand switch;
  • neutral light switch.

Good luck and thank you for using FixYa.

Apr 21, 2009 | 1997 kawasaki ZX-6R Ninja

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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