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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  • Honda Master
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Clymer manual!

Posted on Sep 15, 2010

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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

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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

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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

Spark


if theres no immoberliser check pickup coil on end of crank wiht ome meter then check IN coils,if thay have 0 resistance thay need 2 be replaced

Apr 05, 2009 | 1996 kawasaki ZX-7RR

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

3 Answers

19-95 KLF300 ATV Kawasaki 4x4 no spark put new ignitor unit on.


You said the motor cut out and popped and backfired when it quit, this is almost always one of two things; either the low speed pulse coil or the actual CDI "black" box. You will almost never lose a main coil. One thing I would also check to make sure did not happen is shearing a flywheel mag key. When the motor backfires you can easily shear a mag key if you have a heavy flywheel, (external). However when this happens you don't usually lose spark but it will certainly cause the backfire.
One other item of importance is that the bike you are in question about does not emit a bright spark when you are checking for fire. Make sure you are using a brand new plug and ground it on the head. Try to make sure you are in a dark environment when you check the spark.

Dec 13, 2008 | kawasaki KLX 300 Motorcycles

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