i am just trying to sort out my non starting xt600e. i have little sparks in batches of 3 about 2 seconds apart which don't do much for ignition! just found the CDI box under the seat hump. i have replaced the ignition coil to no effect. i have to check the pick up coil and generator. pleased you got yours going.
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?
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
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.
Interesting timing on this vid, Max. I followed a guide to cut a wire to the CDI last weekend. The bastard box was retarding the timing of the ignition apparently to ensure the rev's don't pick up too quickly and fail a fly-by noise emissions test. The engine is so much smoother and it fixed the flat spots I was running into. 5k on the bike (GT250), 2nd owner and only now is it running like it should have from the beginning. Beware evil CDIs!
If you suspect you cdi box, try heating it with a hair dryer until too hot to touch, then try to start your engine if it starts as it probably will your cdi unit has failed. A company called Carmo in the Netherlands can repair them.
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?
to mrmaxstory from henry martin; can the battery have an effect on the scooter starting, i heard that the scooter will start without the battery, please advise.
Yes the battery will have an affect, depending on the design of the ignition system it may be able to be started without a battery, but more likely than not a battery is required in order to get a good spark
Loved the video, certainly helped a lot. I'm trying to track down my no spark issue on a 1986 SRX600, I was looking for a video with someone that had a similar old coil that showed how to test it, your's helped a ton.
Well done. When I was younger, I used to stick a screw driver in the spark plug cable while resting the shaft of the screw driver against the frame. The I'd cranks the inline and check for a spark.
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
Its a wire that leads directly from the battery and has 12 volts to it, so when it touches the frame which is the ground, it shorts and causes heat. The solenoid may be to blame, or it may be a rogue wire like I described. Watch my video on wiring diagrams for more info.
Check coil by wiring copper wire to iron coil core then to one of leads thento positive, Touch other lead to ground and spark plug wire will spark to ground. Like the cdi/tci the spark happens when ground is disconnected. On cdi/tci check for safety controls. Side stand minus neutral on OR Kill switch on. Check the pickup. Broken wire (open circuit), pinched/shorted (rings true to ground). Check ohms across leads, some bikes have multiple pickups.(2 for two cylinders). Repair is possible.
Max im glad your staying strong with the video makin just checkin in and sayin IM ALIVE. just with my injury aint been able to do much of anything so havent had anything new to say but i watch your vids. THANKS FOR YOUR DEDICATION IM SURE YOUR MUCH APPRECIATED BY MANY OF US :)
HEY MR! I have a 1996 Yamaha Wave Raider 1100! Useully runs great! But it stalled twice on me out there....installed new Start/Stop Switch Box & new Starter Solenoid! When I jump the Solenoid terminals it cranks over fine! Nothing when I hit the Green Start Button!!! There in No Power to the White Start/Stop Connector comming from the CDI Box!!! Any idea's?
I had an xt550 summers of 1988 and 1989. Started stranding me everywhere…. I’d start pushing it towards work and let it cool down and then it would start again. Cost $300 bucks to fix which was more than a weeks pay. I only paid $675 for the bike in good condition. Sold it shortly after I got it back…..
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?
Id first check out the intake and air/fuel mixture. Is the airbox and boots all stock, tight and no vacuum leaks? Carb jets are clear and the stock size, float level set appropriately, clean air filter, good gas? These little bikes are very sensitive to inconsistencies in the intake
I have a Yamaha XT 600 motor and the wiring on the stator and that the plugins been cut off as well as the plug in for the CDI box I don't know where all the wires go to could you please help
Yeah this is Tim again on this 600 XT motor does Stater has no plugins they've been cut off the and the rectifier has no plugin I'm trying to figure out how to rewire this thing can anybody help
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
How good is the battery? All wire connections? Is the kill switch on and functioning? Any safety switches, like a kickstand switch for example, which may be preventing the bike from starting?
I have a cd 250 and at ideal it wants to rev up and then drop back down to normal, it also wants to stall when when down shifting. Is this related to the CDI box.
just a quick question..i have a gsxr 750 sling...when it gets hot it doesn't fire on all cylinders is this a coil problem and if it is can i replace it with any coil or does it have to be same bike?
I believe the timing is good as the problem comes on and off instantly. It could be the secondary, I don't know what that is, I was just told to make sure it was under 1ohm between the only 2 wires going into the coil.
It's not just at high revs, it's always, especially low revs. At least it has a slim chance of snapping full power for a second at wot and/or high throttle. What's the plug gap, I can regap. I cleaned the carbs before I looked at ignition including soaking the jets (all looked pretty clean).
I have a kawasaki klx650. Key was lost while out riding.. Had to remove key cylinder.. Cut the wires attempt to hotwire.. But all 6wires are dead..how can this be?
o.k so i checked the plugs they r o.k. but as i open the air box i noticed that the breather hose to the air box is oily, and around the air box seal. what does that mean, and what is the function of the breather hose? bike 01 magna 750
I have a roketa 50cc scooter that was running great until last night when I left it outside while it showered for 20 minutes. It was dirty so if figured it would be fine. After the rain I tried to start her and it started but the my tack was reading 10,000 rpm but the bike was idling at about 2 then it stopped running. I bought it with a racing cdi on it. I'm getting spark and gas but can't get it to run now. I'm thinking a cdi because of my tack being off.
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.
I dont think that the CDI being plugged in will affect your coils, but hell give it a try. What are your ohms when the coils are disconnected from the rest of the bike?
Was blowing fuses left and right this morning so went over all wires and checked for frayes and tears and found nothing now the fuse aint blowing but not getting power to anything at all any ideas?
I have a '82 CM450E. My bike was dogging below like 40% load, then it would come to life. Then the point at which it would "come to life" became higher and higher until it got to the point where it was always dogging. WOT gets me to like 45 unless it randomly decides to crack full power at WOT. Cleaned the carbs, no change. I realized it was running on one cylinder, but I have a (VERY VERY FAINT) spark on both plugs. . So......coil or CDI box? I don't like throwign $80 at something but...
I just got a 1998 Yamaha Warrior 350, the guy I got it from put a motor in it from a 1994 Yamaha Warrior. It has no spark. Is this swap even something that can be done? Do you know where I can maybe download a wiring diagram for both year models for free? Any help would be greatly apperciated...
hey im owner of kawasaki eliminator 175 and my cdi was stoped working and im also unable to find new or older cdi for it.. so plz tell me is that possible to replace with kawasaki eliminator 125cdi
Thinking my old enduro has weak spark. Replaced the CDI with a rebuilt one and have no spark at all. Put the old one back in, there's spark. Bike is running crappy but it will start. Got good compression. Seems that I have a bad headlight, though. Do you know if that can cause spark issues? I replaced a bad signal wire but no change in performance.
Yeah its all encased in rosin, some guys actually do repair them but they have to very gently melt that stuff off, it takes days Ive heard. Ive no patience for that
Hey Mr. Max, found the vid that u mentioned. On my 75' Honda I don't have but two test points one from the points and the other going to the plug. So I guess just go to ground on both of the wires and read the ohm? Then check the book. And I don't have a CDI box, maybe I should convert? Are they fairly reliable? I just need a spark. Could a rectifier cause any trouble starting? Thanks.
Sir, I have a 2006 Suzuki GSX1300R Haybusa and it ran great. Now I cant get any spark? It has a new batt. an plug's. I started it at least 2 times during winter and let it warm up. When I went to start it I cant get any spark? I've tried everything! Any Idea's?
Hello, i have a chinese 4stroke 125cc called gladiator and i have replaced, starter motor, spark plug, solenoid, battery and still no spark. can you help me out?
sometimes it sounds like theere is a hole in my exhaust but if i turn my engine of and back on its fine my powervalve open and closes a lot by itself but today it happend and it satyed like there was a hole in my exhaust none of my lights are workin bike still starts first kick drives fine do you think my cdi unit is gone seems like it? oh and by the way i have a 2001 yamaha dt 125R and i only replaced the battery and the voltage regulator so it can't be them thanks for your help!
Yeah you have to hit it with a MAP torch just until it smokes again, then submerge it in a bucket of cold water to condense the smoke and it will trap the smoke back inside the box. A handful of 9v batteries in the water also helps.
Well, looks like you were right, paid $100 for a CDI box (brand new, the guy builds 'em and bench tests 'em, "CDIMagician" on ebay). Runs identical as before. . I've heard that the coil should have no more than 1 Ohm of resistance in it and mine has like .6 (and my multimeter was measured against a 1 Ohm resistor, so it's pretty accurate). All the stator checks I did checked out. Not quite sure where to turn now.
Soon as I saw the gas tank I knew it was a CDI box! Most common failure/model. If the CDI is black and you have no spark, buy the new brown one for $500 and you have a reliable, working XT again.
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
any ideas to what it might be then? like why none of the lights are comin on and there is only one fuse on the bike and when its blown the lights still work so its not the fuse
i had that same problem with my kx, cleaning the carb helped plus some pin inside was tight. not that sure the exact thing but it was around the area of the floats
2 роки тому
Hi. Can you tell me what is the function of the control unit assembly in the Yamaha?? Many thanks.
Hola tengo una duda con el cdi Honda Interceptor vf750f , es que la moto trae un caja cdi más grande que la otra , aque se debe la diferencia de los dos CDI ? Gracias .
i have a honda magna vf750, the bike will start but once running the RPMs will fluctuate up and down. normal operating range should be around 1000rpm the bike will rev up to 2000 then back down to 500 on its own and runs really rough could the CDI box have something to do with this?
ive just spent like 500bucks on trying to figure out why i wasnt getting any spark.....ended up changing everything from the stator, coils, relays, and the CDI box....so i know how expensive these can get.....that haymeer you used, where can i pick that up? i cant find it on ebay.
Yeah, and normally I'd be all over that, but I haven't had the time to test it all.. :(. Kind of just want to drop the money but I hate throwing parts at it. Lack of time is killing me. Was just wondering if you had an opinion as the culprit for a weak spark, sometimes coming to life under high load. New plugs.
Will you still have spark if the cdi box isnt working? Or would it just kill spark completly? Ive got spark and fuel but wont fire up. Im wondering if its just a wrak spark from cdi? Ive tested coil and ive got new plugs
Can a cdi igniter on a 86 ninja cause 2 cylinders to cut out for minutes at a time it idles fine then as rpm goes up it runs rough then all a sudden it runs perfect. I changed coils and carbs.
Hello, I'm having some trouble with my cbr f3. The bike will not go over 55mph. It's like it's starving for gas past third gear. The carbs is good the fuel pump is good new plugs. It feels like the carb bowls are out of gas and when you give it gas feels like its empty. My question is can electrical produce the same symptom I'm having? I was thinking it was a fuel problem but note I'm thinking it could b spark
I can try running a battery from my friend's bike temporarily to see. None of the wiring looks damaged, but that's obviously not a be all analysis. Hard to test it all. I'll check out what I can.
mrmaxstorey Hi i am looking for a coil for my drz 125, and i cant find any. THere are many others for much cheaper but im not sure if it would work correctly since they are not made for the drz 125. Does it matter? Do you have to buy the exact same coil? thanks in advance!
So, I went out in the cold and did some investigation. Started double checking wiring connection and it seems there may be a problem in the kill switch wiring. Not sure why it only affected one cylinder....but yeah.
![HOW TO TEST A STATOR / WHAT IS A STATOR [step by step] GY6](http://i.ytimg.com/vi/VoXYzQ61tRM/mqdefault.jpg)
![HOW TO TEST A STATOR / WHAT IS A STATOR [step by step] GY6](/img/tr.png)
i am just trying to sort out my non starting xt600e. i have little sparks in batches of 3 about 2 seconds apart which don't do much for ignition! just found the CDI box under the seat hump. i have replaced the ignition coil to no effect. i have to check the pick up coil and generator. pleased you got yours going.
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?
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
That "heymare" or "haamare" must be the latest in the technological advancement of the tool industry. Definitely a must have...
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.
Interesting timing on this vid, Max. I followed a guide to cut a wire to the CDI last weekend. The bastard box was retarding the timing of the ignition apparently to ensure the rev's don't pick up too quickly and fail a fly-by noise emissions test.
The engine is so much smoother and it fixed the flat spots I was running into. 5k on the bike (GT250), 2nd owner and only now is it running like it should have from the beginning.
Beware evil CDIs!
If you suspect you cdi box, try heating it with a hair dryer until too hot to touch, then try to start your engine if it starts as it probably will your cdi unit has failed. A company called Carmo in the Netherlands can repair them.
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?
to mrmaxstory from henry martin; can the battery have an effect on the scooter starting, i heard that the scooter will start without the battery, please advise.
No you can just test the resistance doesnt have to warm up or anything. If it is out of specs then replace it
do you have any video that related to auto and clutch plate or something that related to engine?
Yes the battery will have an affect, depending on the design of the ignition system it may be able to be started without a battery, but more likely than not a battery is required in order to get a good spark
Loved the video, certainly helped a lot. I'm trying to track down my no spark issue on a 1986 SRX600, I was looking for a video with someone that had a similar old coil that showed how to test it, your's helped a ton.
Knowing how a CDI module works helps you with troubleshooting the ignition system.
Well done. When I was younger, I used to stick a screw driver in the spark plug cable while resting the shaft of the screw driver against the frame. The I'd cranks the inline and check for a spark.
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
Its a wire that leads directly from the battery and has 12 volts to it, so when it touches the frame which is the ground, it shorts and causes heat. The solenoid may be to blame, or it may be a rogue wire like I described. Watch my video on wiring diagrams for more info.
What does the spark look like? Is it fat and blue, or yellow/orangish color?
Check coil by wiring copper wire to iron coil core then to one of leads thento positive, Touch other lead to ground and spark plug wire will spark to ground. Like the cdi/tci the spark happens when ground is disconnected.
On cdi/tci check for safety controls. Side stand minus neutral on OR Kill switch on.
Check the pickup. Broken wire (open circuit), pinched/shorted (rings true to ground).
Check ohms across leads, some bikes have multiple pickups.(2 for two cylinders).
Repair is possible.
Max im glad your staying strong with the video makin just checkin in and sayin IM ALIVE. just with my injury aint been able to do much of anything so havent had anything new to say but i watch your vids. THANKS FOR YOUR DEDICATION IM SURE YOUR MUCH APPRECIATED BY MANY OF US :)
have you checked the CDI box !
Good job brother 😊 but it hurts to see how you smashed the expensive CDI box
Thanks man helped a lot, building a 1994 CR125R
HEY MR! I have a 1996 Yamaha Wave Raider 1100! Useully runs great! But it stalled twice on me out there....installed new Start/Stop Switch Box & new Starter Solenoid! When I jump the Solenoid terminals it cranks over fine! Nothing when I hit the Green Start Button!!! There in No Power to the White Start/Stop Connector comming from the CDI Box!!!
Any idea's?
Yup, I think my Honda needs one of them there " smoke boxes".... :)
I had an xt550 summers of 1988 and 1989. Started stranding me everywhere…. I’d start pushing it towards work and let it cool down and then it would start again. Cost $300 bucks to fix which was more than a weeks pay. I only paid $675 for the bike in good condition. Sold it shortly after I got it back…..
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?
Id first check out the intake and air/fuel mixture. Is the airbox and boots all stock, tight and no vacuum leaks? Carb jets are clear and the stock size, float level set appropriately, clean air filter, good gas? These little bikes are very sensitive to inconsistencies in the intake
I have a Yamaha XT 600 motor and the wiring on the stator and that the plugins been cut off as well as the plug in for the CDI box I don't know where all the wires go to could you please help
Yeah this is Tim again on this 600 XT motor does Stater has no plugins they've been cut off the and the rectifier has no plugin I'm trying to figure out how to rewire this thing can anybody help
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
How good is the battery? All wire connections? Is the kill switch on and functioning? Any safety switches, like a kickstand switch for example, which may be preventing the bike from starting?
I have a cd 250 and at ideal it wants to rev up and then drop back down to normal, it also wants to stall when when down shifting. Is this related to the CDI box.
just a quick question..i have a gsxr 750 sling...when it gets hot it doesn't fire on all cylinders is this a coil problem and if it is can i replace it with any coil or does it have to be same bike?
I believe the timing is good as the problem comes on and off instantly. It could be the secondary, I don't know what that is, I was just told to make sure it was under 1ohm between the only 2 wires going into the coil.
I heard it's bad to install an alarm system on a scooter because it could cause problems to the ignition coil, it's true?
In my experience, CDI boxes will either completely fail suddenly, or just get gradually worse. What does your spark look like?
It's not just at high revs, it's always, especially low revs. At least it has a slim chance of snapping full power for a second at wot and/or high throttle. What's the plug gap, I can regap. I cleaned the carbs before I looked at ignition including soaking the jets (all looked pretty clean).
Fairly easy, so long as it is a decent bike to begin with and has been cared for. They are awesome bikes, very reliable. I have one
I have a kawasaki klx650. Key was lost while out riding.. Had to remove key cylinder.. Cut the wires attempt to hotwire.. But all 6wires are dead..how can this be?
I have a 1980 Yamaha 100 and i have just put in a new Spark plug. Still no spark!
When I test it nothing comes up on the multimeter. Can you help
o.k so i checked the plugs they r o.k. but as i open the air box i noticed that the breather hose to the air box is oily, and around the air box seal. what does that mean, and what is the function of the breather hose? bike 01 magna 750
I have a roketa 50cc scooter that was running great until last night when I left it outside while it showered for 20 minutes. It was dirty so if figured it would be fine. After the rain I tried to start her and it started but the my tack was reading 10,000 rpm but the bike was idling at about 2 then it stopped running. I bought it with a racing cdi on it. I'm getting spark and gas but can't get it to run now. I'm thinking a cdi because of my tack being off.
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.
+Valerie Gobaira Thats a pretty good start. Sounds like you have a real mess in there.
Yeah. It was perfect but i used crappy electrical tape.
I dont think that the CDI being plugged in will affect your coils, but hell give it a try. What are your ohms when the coils are disconnected from the rest of the bike?
UA-cam doesnt let me post links. just search wiring diagram in the searchbar in my channel
Was blowing fuses left and right this morning so went over all wires and checked for frayes and tears and found nothing now the fuse aint blowing but not getting power to anything at all any ideas?
I have a '82 CM450E. My bike was dogging below like 40% load, then it would come to life. Then the point at which it would "come to life" became higher and higher until it got to the point where it was always dogging. WOT gets me to like 45 unless it randomly decides to crack full power at WOT. Cleaned the carbs, no change. I realized it was running on one cylinder, but I have a (VERY VERY FAINT) spark on both plugs.
.
So......coil or CDI box? I don't like throwign $80 at something but...
My GN250 is not firing properly while riding at high reves..... should I take the black box off and smash it open with a hammer ?
Hope you got to go on youre travels some wild bikes on here ,
I just got a 1998 Yamaha Warrior 350, the guy I got it from put a motor in it from a 1994 Yamaha Warrior. It has no spark. Is this swap even something that can be done? Do you know where I can maybe download a wiring diagram for both year models for free? Any help would be greatly apperciated...
Lol. Never good to let the smoke out. That's what I learned in electrical and electronic engineering.
I've been watching a lot of your vids, I'm getting a 91 fzr1000 I'm preparing myself for any surprises. Great how to's keep em comin.
hey im owner of kawasaki eliminator 175 and my cdi was stoped working and im also unable to find new or older cdi for it.. so plz tell me is that possible to replace with kawasaki eliminator 125cdi
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
Thinking my old enduro has weak spark. Replaced the CDI with a rebuilt one and have no spark at all. Put the old one back in, there's spark. Bike is running crappy but it will start. Got good compression. Seems that I have a bad headlight, though. Do you know if that can cause spark issues? I replaced a bad signal wire but no change in performance.
Yeah its all encased in rosin, some guys actually do repair them but they have to very gently melt that stuff off, it takes days Ive heard. Ive no patience for that
I like you when you smash the CDI box you did it for me thank you
Hey Mr. Max, found the vid that u mentioned. On my 75' Honda I don't have but two test points one from the points and the other going to the plug. So I guess just go to ground on both of the wires and read the ohm? Then check the book. And I don't have a CDI box, maybe I should convert? Are they fairly reliable? I just need a spark. Could a rectifier cause any trouble starting? Thanks.
Sir, I have a 2006 Suzuki GSX1300R Haybusa and it ran great. Now I cant get any spark? It has a new batt. an plug's. I started it at least 2 times during winter and let it warm up. When I went to start it I cant get any spark? I've tried everything! Any Idea's?
If you have a strong spark then the CDI is probably fine. Do you have any modifications to the intake or is it stock?
Glad to hear it man, heal up and get back out there asap
i have a weak spark kx 250. its orange. stator tests good cdi as well im replacing the coil. im waiting for it.
Hello, i have a chinese 4stroke 125cc called gladiator and i have replaced, starter motor, spark plug, solenoid, battery and still no spark. can you help me out?
sometimes it sounds like theere is a hole in my exhaust but if i turn my engine of and back on its fine my powervalve open and closes a lot by itself but today it happend and it satyed like there was a hole in my exhaust none of my lights are workin bike still starts first kick drives fine do you think my cdi unit is gone seems like it? oh and by the way i have a 2001 yamaha dt 125R and i only replaced the battery and the voltage regulator so it can't be them thanks for your help!
It is usually a little oily. Its job is to take crankcase gasses back to the airbox to reburn them and often it gets a tad oily
that smoke joke is so good
Can the smoke be replaced after you release it??
Yeah you have to hit it with a MAP torch just until it smokes again, then submerge it in a bucket of cold water to condense the smoke and it will trap the smoke back inside the box. A handful of 9v batteries in the water also helps.
It's very simple to replace the smoke that you've lost, just set the CDI on fire and the smoke will return.
Well, looks like you were right, paid $100 for a CDI box (brand new, the guy builds 'em and bench tests 'em, "CDIMagician" on ebay). Runs identical as before.
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I've heard that the coil should have no more than 1 Ohm of resistance in it and mine has like .6 (and my multimeter was measured against a 1 Ohm resistor, so it's pretty accurate). All the stator checks I did checked out. Not quite sure where to turn now.
Soon as I saw the gas tank I knew it was a CDI box! Most common failure/model. If the CDI is black and you have no spark, buy the new brown one for $500 and you have a reliable, working XT again.
i have a permanant live at my spark plug cable does this mean the cdi box has failed
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
any ideas to what it might be then? like why none of the lights are comin on and there is only one fuse on the bike and when its blown the lights still work so its not the fuse
i had that same problem with my kx, cleaning the carb helped plus some pin inside was tight. not that sure the exact thing but it was around the area of the floats
Hi.
Can you tell me what is the function of the control unit assembly in the Yamaha??
Many thanks.
I like you dude, keep my smiling while educating me👍🏼
don't be a hater. he may not be as smart as you, but he taught ME something, therefore, i am appreciative.
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 ?
Hola tengo una duda con el cdi Honda Interceptor vf750f , es que la moto trae un caja cdi más grande que la otra , aque se debe la diferencia de los dos CDI ?
Gracias .
i have a honda magna vf750, the bike will start but once running the RPMs will fluctuate up and down. normal operating range should be around 1000rpm the bike will rev up to 2000 then back down to 500 on its own and runs really rough could the CDI box have something to do with this?
ive just spent like 500bucks on trying to figure out why i wasnt getting any spark.....ended up changing everything from the stator, coils, relays, and the CDI box....so i know how expensive these can get.....that haymeer you used, where can i pick that up? i cant find it on ebay.
Accel makes aftermarket CDI boxes. Thats going to be my step if mine every goes out. I already have their coils, and wires on my bike
Yeah, and normally I'd be all over that, but I haven't had the time to test it all.. :(. Kind of just want to drop the money but I hate throwing parts at it. Lack of time is killing me. Was just wondering if you had an opinion as the culprit for a weak spark, sometimes coming to life under high load. New plugs.
Very well could be. Try switching the coils and see if the spark changes sides, if it does you know thats the culprit
Will you still have spark if the cdi box isnt working? Or would it just kill spark completly? Ive got spark and fuel but wont fire up. Im wondering if its just a wrak spark from cdi? Ive tested coil and ive got new plugs
Usually it kills spark completely, on rare occasions a bad CDI will kill spark on one cylinder. If you have spark and fuel check your compression
My 79 suzuki gs750l's middle two cylinders intermittently fire, usually after it's warm. Does this sound more like a loose ground?
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??
Lots of things could be causing this, vacuum leaks, vapor lock, failing coil, spark wires corroded or partially dislodged
good demonstration have ag200 which produce sparks once then goes off what could be problem
+Kennedy Odewa Poor wire connection
Can a cdi igniter on a 86 ninja cause 2 cylinders to cut out for minutes at a time it idles fine then as rpm goes up it runs rough then all a sudden it runs perfect. I changed coils and carbs.
Hello, I'm having some trouble with my cbr f3. The bike will not go over 55mph. It's like it's starving for gas past third gear. The carbs is good the fuel pump is good new plugs. It feels like the carb bowls are out of gas and when you give it gas feels like its empty. My question is can electrical produce the same symptom I'm having? I was thinking it was a fuel problem but note I'm thinking it could b spark
How easy you think it'd be to maintain a working 1984 Honda VF750?
I can try running a battery from my friend's bike temporarily to see. None of the wiring looks damaged, but that's obviously not a be all analysis. Hard to test it all. I'll check out what I can.
will it be bad for the electrical components...(ignition)?
I cant say for sure. You can test the coil using the method I showed. Its also likely that you have a loos wire somewhere
Hey man i got an xt 550 too, It will only rev past about 4-5 at idle, never under load it just bogs out like instantly any ideas?
So if u have a crank start bike will it start wirh a bad cdi
No a cdi is required to make a spark
mrmaxstorey Hi i am looking for a coil for my drz 125, and i cant find any. THere are many others for much cheaper but im not sure if it would work correctly since they are not made for the drz 125. Does it matter? Do you have to buy the exact same coil? thanks in advance!
If you can find one. Pretty much all bikes use their own CDI's. What bike are you working on?
I have a xr250 dirtbike with weak spark not running what do you think?
So, I went out in the cold and did some investigation. Started double checking wiring connection and it seems there may be a problem in the kill switch wiring. Not sure why it only affected one cylinder....but yeah.
That is unusual, try repairing it and see if it solves your problem.
I am amazed how you know so much about bikes... did you go to a special school?
lookin for a cdi to replace my hei...did i take a wrong turn?