Question about 2003 Suzuki RM 125

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Fresh rebuild now no spark

I just put new topend kit in bike ran before can you give me specs to coil and pu coil and cdi box

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If it ran before, I would double check your electrical connections. Its more likely you didn't get a connector pushed all the way together or left off a ground wire. The ignition coil specs are generally 1 ohm or less on the primary (small Wire) side, and 5K-10K ohms on the secondary (spark plug) side. Each side should be tested to ground. Pick-up coils are typically open or really large ohm reading in Megaohms normally and around 100 ohms when the magnet on the flywheel passes by. there is no way to test the CDI box other than putting it on a know running bike or getting a known good CDI and putting it on your bike. Double check that the spark plug cap is secured to the high tension lead as well. Testing the stator is a little more complicated, but a quick way is to close the gap on an old spark plug to about 0.010" and see if there is a week spark. If so, the stator will need to be replaced.

Posted on Jun 16, 2009

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1 Answer

2007 ATK dirt bike no spark


Hi, Ken 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.
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8. Faulty ignition switch.
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1 Answer

How to bypass cdi box on 95 1500 vulcan


So you want a bike that doesn't run?

CDI = Capacitive Discharge Ignition. The box amplifies the small signal from the magnet that spins in front of coils that are timed to just before TDC, Top Dead Centre when your fuel air mixture is ignited. That small signal is amplified and then powers your coils to give the spark to the spark plug. You can't bypass it as it is integral to your bike running.

May 07, 2016 | Motorcycles

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My brother has a yz80we rebuilt the carb put a new plug in it n it still won't start it has fire and fuel key way isn't broken


I have had lots of these bikes, even though you see fire, put the plug in coil wire, and hold spark plug-kick over with other hand,yea if it knocks heck out of ya you know mag, and cdi box is good. If you only feel a lil nothing to big get a cdi box new. Now you say its getting fuel. when you choke it should show fuel on plug. You need to take carb back off to see if the power reeds are good, or got damaged when you took off carb to rebuild. good luck guys 2 strokes rule....................

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Why does my new coil (coil 1) cut in and out?


Not sure what bike you have. I ran into a similar problem with several small engines and the CDI box was the culprit. Replacing with a new coil seemed to fix the problem but it would come back when the box cooled down. You may also try looking for chewed wires on your ECU. Look very closely for any missing insulation on the wire. You may also want to double check the connections to the coil to make sure they are snug.

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What interchanges with an 84 kdx 200 cdi box


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Mar 08, 2013 | Motorcycles

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Honda crf450 no spark atall plenty of power out of stator changed cdi nd had coil checked all ok tried dissconecting kill switch to.


maybe get a new spark plug.make sure your grounded(earthed). did you take the plug out and check for spark against the motor while you cranked the bike over?

Oct 17, 2010 | 2002 Honda CRF 450 R

1 Answer

How to test ignition coils and cdi box for a miss


There is no easy way of testing a CDI completely, best thing to do is to check the spark plugs are sparking by removing them from bike and holding them against frame to earth (still connected to coils), crank bike over and check for a fat blue spark. Be warned, DO NOT hold with bare hands as you will get a electric shock!! This will give you an indication that the CDI is working.

Mar 11, 2010 | Suzuki GSX-R 750 WS Motorcycles

1 Answer

No spark put on a new cdi box coil good and a new stater


hi,sounds to me like your cdi pickup unit has failed,i am not 100% certain but this will be located on the end of the crankshaft behind one of the enginecovers,there could be two other possibilities,motox bikes are notorious for breaking wires so check the wiring from the cdi sender unit to the cdi box and the coil,also check your "off"button it may be stuck in the "kill" position..hope this helps..cheers ian

Dec 26, 2009 | Suzuki RM 125 Motorcycles

1 Answer

I recently rebuilt the topend on my son's 01 kx 100 new cylinder and all. The bike runs great at low to mid rpm but when up in the topend range of the power band it looses all power and runs very rough! My...


I'd bet you 10 to 1 it's not the coil. It sounds like it is starving for fuel and needs a carburetor adjustment. When you rebuilt the top end, did you put a bigger jug and piston? If so, your problem most definitely is the carburetor needs to be re-jetted.

What caused you to rebuild it? Did it seize, or quit running? Was it losing power before the rebuild?

That's where my money is but if you still believe it is the coil, you can check it with a spark checker. This is a handy little tool you can find at AutoZone, Harbor Freight, etc. It's a one piece tool that connects between the plug and the coil. The plug stays in but you remove the wire and put the checker on, one side connects to the plug, the other side you connect the plug wire. There is a light in the middle that will flicker when you crank the engine if it has a good coil.

Put the checker on and start the bike and see if you are losing spark...if the light stops flickering at top end, then you do have a coil issue...but like I said before, having seen this problem hundreds of times, my money will be on re-jetting the carburetor.

Nov 08, 2009 | 2001 kawasaki KMX 125

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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