How To Test Motorcycle CDI Box, Ignition Coil




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Michael Marshal: i have a yam 125 too with no spark :/ .......got wet now wont fire ........you think cdi and coil then ?

Nut Shell: \pleeeeeze help im going to be buying a 95 zx9r with no spark has compression but wont start its my first owned bike just dont want it to be a money pit

Kyle Potgieter: hey man you really seem to know whats going on, please send me a mail, kylepotigter@gmail.com i need some help on my bike.

jason ferguson: Hey mrmax, great vid. I have 1995 triumph speed triple 900 just fitted new engine. Starting no probs, though 3rd header pipe staying cold on tickover until you rev it a bit. Take it out on the road and is fine for 100 yrds or so then starts cutting out suddenly then starts again after 30 seconds or so and then keeps doing the same. Swapped coils over same symptoms, same cylinder, changed plugs, any ideas dude? just gonna check yer diagnostics site, cheers 

kevin ouwersloot: the problem is that you wreck the plate

Goingin007: And turns off

Jonathan Canales: I was like, "It runs on smoke! What the freak!"

mrmaxstorey: Thats old for a scooter battery. Start there, replace it and charge up the new one

mrmaxstorey: This one was full of resin too, some guys will meticulously melt it off on low heat to try to repair it if it goes south, but I didnt have the patience. Apparently the resin is a good idea for use on a bike that bounces up and down so much, but it does effectively make the CDI a replacement unit only

mrmaxstorey: Nah I dont think its your CDI, if your bike runs then it is sparking and your cdi is fine

Francis Collier: I just bought a 97 gsxr 750... Its been sitting for 2 years. Ive changed the plugs, oil, fuel, cleaned fuel tank and lines, new battery, and cleaned the heck outta the carburetors. The bike will run at idle but when I ride about a mile down the road the bike just shuts off and then about 15 to 20 mins later ill be able to start it again. Some one please help?? Thanks

ninjawy kawa: kawasaki zx11 1992 timing is 1.2.4.3

mrmaxstorey: Clogged jets, vacuum leaks, bad air filter, or disconnected components of the intake system are the most common causes

steven bloomfield: sooooo.... where can i find a smoke injector

iwicdieify: hey man, i got a question, when i check putting the negative onto the ignition coil and the positive into the plug doesn't read anything but the plug is new and the wire too, it could be the ignition coil?? and also mark 4.0 when i test the ignition coil i have to replace that?? thanks

mrmaxstorey: For a healthy spark it should be fat and blue

mrmaxstorey: Nothing about clutch plates, but I do have several engine videos up, such as how to replace the head gasket, and how to replace timing belt

mrmaxstorey: If you can find one. Pretty much all bikes use their own CDI's. What bike are you working on?

MrGerryking21: So how wold I find that and what's the hot wire u talk about?

mrmaxstorey: Check out the motorcycle diagnostic website I made, it will cover all kinds of problems better than I could in a video. TheMotorcycleMedic (dot) com

frethand101: Question,I got an 82 xs400j maxim that was trouble free for 5yrs..I did a basic tear down to clean/paint the frame,etc..Now the bike runs bad,plugs are black..Ive spent the last month X-ing out every possible cause & I'm down to IgnSyst..Im leaning toward the PupCoils or my CDI but my test result has got me on the fence..According to spec,my PupCoils should read 150-170ohm..While plugged into the CDI,w/key on,I get 123ohm..Can a bad CDI alter my Pup result or does this mean Pups are bad?..

hoochipappie: maybe you should burn it???

jose cardinal: its better 2stroke are smoke..and are 4stroke are not better to smoke..

ninjawy kawa: thnx, i will.

mrmaxstorey: Nice

ninjawy kawa: thnx for ur reply , the problem is that i can't find a replacement in my country ,can i use another bike cdi that has the same ignition timing ?

mrmaxstorey: Then yeah go for it. Solder another wire onto it and youre good to go

george lucas weiss: man, my cbr 450 sr 1990 has a big problem with this CDI

gksypher: Your lucky you can actually get to the circuit board on that , my one is full of plastic resin :( . I could repair it as it is prob only a transistor that is faulty .. but nooo cover the whole board in plastic so you cant get to any componants :( guuurrrrrr

uday bhaskar Medida: my yamaha bike is getting off while running, my battery is ok and carburetor also cleaned what might be the problem.............please help me

mrmaxstorey: Yeah. I think its french or something

henry martin: Help, i got no spark and got a new CDI box and no start, so, i got a new ignition coil and still won't start, any advice to solve this problem, my bike is a 50cc Scooter chinese 4 stroke 2009,thanks.

steven bloomfield: lol

mrmaxstorey: Probably not

giordanobill2012: I have a 84 GPS 900 ninja its getting intermittent spark every once in a while should that be my CD box or my coils

mrmaxstorey: could be

Johnny Wieler: Ok i got a 2007 suzuki ltr wen its cold it starts good and runs for a lil...wen its warmed up it don't wanna start jus turn over??

mrmaxstorey: They should be on different circuits. Maybe your cdi is on the way out, and the rebuilt one is faulty?

spy111kill: Hey max! I have question. Is there any way to fix my CDI boxes connector wires? Why I'm asking this is I have an ATV and the CDI boxes connector wires are off. Is there any way to fix them?

Rawsome Wayne: Hi Max.i have a 1982 Suzuki GSX 400f ,it starts up fine runs well ,but as soon as it gets hot it just cuts out,i have been told its probably the CDI unit,,what do you think ???

dustin hepp: I have a yz 250,does it need to have a certain amount of spark cuz it only has a lil spark.any suggestions..plz thank you

Repdan1: ok so the lights went on today for a few minutes so its not my cdi in anyways thank god it was just a co-incidence my gasket moved outta place when my lights went of thats fine now so what powers all the lights if not the fuse battery or cdi?

mrmaxstorey: This could be a coil problem, or associated wiring. Its always best to replace with OEM parts, I dont know enough about GSXRs to tell you whether the 600 or 1100 or 1000 will mate up, or even the katanas, so go on ebay and try to find some 750 coils if you suspect they are the source of the problem

henry martin: the battery is almost 4 years old, not charging, and no kill switch on the bike and the side stand seems ok.

Roel Videler: So.... switch it, or smash with hammer and switch it..

mrmaxstorey: In my experience, CDI boxes will either completely fail suddenly, or just get gradually worse. What does your spark look like?

mrmaxstorey: Ha yeah probably the CDI is ok. Check for vapor lock, float levels, and vacuum leaks. Sometimes when your coil and spark wires get hot, if they have a crack in the casing it will allow the spark to ground out on the frame, causing the motor to stumble like it is running out of gas

onlyadrenaline: i have a motorcycle that uses 2 plugs per cylinder. it seems only 1 plug is firing, other one, not at all. my coil resistance is 14kohm, book says 18-20kohm is acceptable. do you think the coils is causing poor spark?

Callahan Banbury: Thanks i'll Check

mrmaxstorey: you might be disappointed
Rating:
How to test motorcycle CDI box, ignition coil 3.8 out of 5

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How to test motorcycle CDI box, ignition coil