How To Test Motorcycle CDI Box, Ignition Coil




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Matthew Vescovi: i have a 1980 yamaha sr250 that has no spark...i have checked the ignition coil, pick up coil, starter solenoid, and battery. they all check out fine. spark plug is new and the safety relay works. heres where things get funky...if i have the ignition on and i put the bike from stop to run and put a meter on my spark plug wire i have a constant 12v. if i leave the meter on the wire and switch it to stop i lose the 12v. my starter button doesnt work either but i think thats just worn contacts. also, will the bike get spark even if the neutral switch is bad? Thanks Matt

Matthew Vescovi: i have a 1980 yamaha sr250 that has no spark...i have checked the ignition coil, pick up coil, starter solenoid, and battery. they all check out fine. spark plug is new and the safety relay works. heres where things get funky...if i have the ignition on and i put the bike from stop to run and put a meter on my spark plug wire i have a constant 12v. if i leave the meter on the wire and switch it to stop i lose the 12v. my starter button doesnt work either but i think thats just worn contacts. also, will the bike get spark even if the neutral switch is bad? Thanks Matt

Danny Vansickle: I have a 94 250 Yamaha Timberwolf and it will start by jumping at the starter.  Will not start from switch.  I have been told I need a CDI box.  What do you say?  Thanks a bunch   Danny

john geni: I have a 2006 Suzuki 200 with 1000 miles. starts and runs fine for about 20-30 min then it starts to bog out then shuts off. the bike will not restart until it cools down which is usually 20 min after it shuts down. any suggestions?

Kennedy Odewa: good demonstration have ag200 which produce sparks once then goes off what could be problem

Paul Bubnash: hey don't know if anyone can help me here. I've got an old 2 stroke scooter, I put a new spark plug in it, (identical to the one taken out, which looked to be as fouled and corroded as a plug can be and still work) it ran fantastic for about 10 minutes and now won't start again. ran great for months before, it cranks and turns over strong and I can see a good spark on the plug when tested, even starting fluid doesn't start it and the plug seems dry after a 2 minute starting attempt at different times. any ideas?

Valerie Gobaira: Hi Mr Max. two months ago I "shorted out" on a hot day and had to push my bike home. It's a 1991 Honda Nighthawk CB750. I removed the seat and saw that the wires from the harness that run under the seat were fried. I removed the harness and replaced it with another one from a twin bike I have for parts. No dice. I ordered a new harness only this one didn't have an extra solenoid. Today I tried to fix again and took out an alarm box that was connected to nothing (I checked it from stem to stern) and ended up removing a bunch of wires. However, from that wiring mess, two black wires were cut into the rear light wires (orange and blue) via two little blue plastic connectors that have little metal pieces in it to cut into the wire.

However, when I turn the key, I don't get any lights or any sign of life. It's dead. I know I have an extra solenoid somewhere. I just ordered an ammeter and will check the solenoid, battery and starter, then will check the kill switch and ignition. \\Do you have any other ideas?

vgobaira@yahoo.com

Thanks and keep up the great work.

Kevin Brain: i have some advice '' never start your bike without a battery connected '' dip crap.

Ted Tate: pretty cool dude, liked the vid. And the smoke joke...lol   thanks....later

James Dean: I have a 650 kawasaki jetski that wont spark. It has new plugs, cdi (which has coils + leads built in) new regulator. There aren't many electronic parts in a jet ski and I have replaced them all. Even has a new battery. It turns over fine but won't spark. I'm out of ideas. 

Levi Kirk: Dude I found one on ebay for 6 bucks works perfect... lol 

al hart: sounds like my moto4 quad, nice.

ATVLIFE 23: Hey mare lol 😭

Timothy Time: My bike went to an old garage.  Mechanic said it had weak spark and blamed the cdi box.  Could that be the correct diagnosis?  Being that my bike is a 81 Suzuki GS1000G, where would I find a replacement that doesn't cost an arm and a leg, like over $200?

cagmito76: great video again max , them XTs are hard to start .

Robert Martinez: I used a multimeter on the ohm setting at 20k. I connected one probe to one of the primary {smaller} wires and the other probe to one of the secondary {spark plug wires}. Nothing happened. I also tasted each spark plug boot independently for resistance and observed them to be working properly. Incidentally, they were installed brand new last summer.
 I did, however, feel a bit of a charge coming from one of the the boots when I first tested the coils.

Robert Martinez: Hi there. I installed brand new aftermarket coils on my '81 gs550. I was careful to follow all the connections of the old coils, but the spark remained weak and eventually the CDI box was fried. I then tested those new coils and found that they were defective. I Want to try installing new coils again {after testing them first this time} and CDI but I'm worried that there is something wrong that may damage these components again. Any thought on how I should approach this problem?

john huffman: Umm my problem is i got my bike running after two years i cleaned the carbs and all the basic start up maintenance replaced the bendix.... noww i go to flip the key and no green light however i press the start button an my oil light appears but no movement in the starter .., so i watched more videos check my siliniod my ground cleaned the inside of the starter button .. all my lights work ... idk

john huffman: So ive watched a bunch of your videos ...where ya at wanna fix my bike i live in ontario

Jo Montana: Yup, I think my Honda needs one of them there " smoke boxes".... :)

School: Thanks for teaching us how to fix it. The problem with most Medical assistant in california is usually the cost of education. Hopefully it'll pay off. Thanks again.
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