I have a 1985 cr500 with no spark . i have replaced the stator, pickup coil, cdi, and had the coil tested . i have check all wiring , grounds, has new plug. any thoughts on what the problem is??

how to fix no spark and wire pit bike - YouTube

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www.buggydepot.com/.../gy6-150cc-ignition-troubleshooting-guide-no-...

May 27, 2014 - Stator (6th winding and trigger pickup module); CDI unit; Ignition coil; Spark ... to check for voltage at the two primary wires of the ignition coil.

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Number 2 is the ignition coil and that is easily found because the large wire and cap ... The final third component is the stator magnetor or magnetic pickup coil.

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Apr 11, 2012 - 90% of no spark is caused by the CDI Charge Coil in the Stator. ... Thestator is located on engine side housing, where a 5 wire unit is coming ...

Bad Stator Fix - Instructables

Possibly a bad ignition coil. Check the connections at the ignition coil,make sure they are clean and tight, If so,..then most likely either A: the ignition coil is bad,or B: the pickup on the stator rotor is bad or the rotor could be rusted on the raised portion where the pickup get its signal.

Had similar problem with a 125cc scooter I worked on. First crank of the engine showed spark on first compression and wouldn't spark anymore until you would wait 10-15 minutes. Then it would give only one spark again.

Found it to be a faulty CDI box.

You can't test or repair a CDI box, only replace it. Electrical parts that are purchased, cannot be returned so, you need to be sure it's not the pickup coil, pulse coil,secondary coil, plug wire, plug cap and spark plug itself before you purchase a box. By checking the specific resistances with a ohm meter on the previous mentioned components, will help determine if it's the box or not. Hope this helps!

My old 73 175 had points, I don't know if yours does. There is also the stator/ magneto. Try disconnecting the kill switch or unplug the key cylinder. There is a more detailed check in the manual. I can't find my old 175 manual but ttr125 says 1) check plug for spark- clean or replace. 2) check entire ignition system for connection. 3) check ignition stop switch. 4) check coil. a- primary coil, b- secondary coil. 5)check cdi coil. a-pickup coil. b- charging coil. Since you have replaced the coil I will only give specs for the cdi check. The picture shows a plug under the tank disconnected. It has four wires brn grn red and wht. To check pick up coil resistance set ohm meter to x 100. attach the plus lead to red and neg. lead to white. It seems to have a short wire in each jaw of the alligator clips of ohmmeter that is pushed into the disconnected plug that contacts appropriate wire color. Reading should be 248 to 372 ohm at 20 degrees C (68 degrees F). Charge coil test places the plus lead of ohmmeter to the brown wire and neg. lead to the green wire of the open plug. Meter at x 100. Reading should be 688 to 1032 ohm at 20degrees C. Of course while doing step 2 check for good grounds and tight connection at plug cap and use a new plug. Good luck.

hello, you probably need to have your stator checked out, sometimes the pickup coil in the stator will go out, also you can try ign coil, the one spark plug wire is hooked to,warriors are bad about cdi going out, mine would idle, would not rev up, would bog down, source coil in stator probably needs to be checked also..

Hi and welcome to FixYa,

Initially, test for the presence / absence of below described voltages using an analog / needle type voltmeter when starting the bike:

• pulsating low AC voltage coming from the pickup coil;
• pulsating voltage feeding the ignition coil.

Good luck and thank you for asking FixYa.

well the stator doesn't give spark it give voltage and if you test it and the is voltage and you have replaced all that stuff with good ones then it is your cdi box.

to test the stator for voltage take a multimeter on the ac scale and test the output of the stator while kicking the bike over if you have voltage rising and falling then your stator is fine. if not you will need to test the pick coil in the stator area for a ground pulse this is what the cdi box uses as a reference for the position of crank shaft and piston. just like a crank sensor in a car. if there is ground pulse there when you back probe the wires coming out of the pick up then your cdi is for sure the issue. if you have any more question please ask. good luck

check the wires that come into and out of the cdi box
if no voltage there check stator for voltage

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.

Yamaha ignition coils never go bad. It is probably the Stator/ Pulser coil (very common). You can check them with a ohm meter. You'll need the readings from a Yamaha dealership. The CDI box is very seldom bad But there is no checks that can be done on it. If everything else is fine ---than Yamaha says it must be the CDI box.(Rare)