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Ignition coil wiring diagram -





Dec 09, 2009 by | Posted in Motorcycles

CDI creating voltage upto coil, but coil is not sparking?

my speedfight CDI (aci 100 (basic ignition)) i think doesn't work because when i disconnect the coil (H/T) it creates a voltage along the line to the coil, but when i connect the coil then it DOESN'T spark and my rpm meter measures zero, (when i had the coil disconnected the rpm meter worked fine and measured the kicks) is my CDI dead? Also i have a new stator and coil and spark plug so i doubt its any of those. Also, in my haynes manual i cannot see the right wiring diagram as my CDI has a black / red which i think comes from the stator plate, but on the manual it says the black / red goes into the ignition then changes colour to black / white (which is also on the CDI) its all very confusing, Any help is welcomed. Thank you.


Check the coil. Then bring the bike to a competent mechanic.

guardrailjim | Dec 09, 2009
Mar 05, 2008 by Alex C | Posted in Motorcycles

my motorcycle wont turn off?

when i turn off the key my bike doesnt turn off and it still sparks with no key in it, the key is only of use for lights. i know it isnt very secure which i why i wont tell you were i live lol but how can i turn it off without having to turn fuel off, stall it etc ive thought of a kill switch but wouldnt this mean it will still spark when theres no key? But the ignition barrel seems to wired to the coil and flywheel fine and to the wiring diagram. REPLIES: answer 1: Pointless answer 2: absolutely brilliant answer, thank you so much youve solved all my problems. (...NOT) answer 3: How do you mean? It sparks i just cant make it stop sparking, i kick-start it, but cannot turn it off. Sensible answers welcome.


You can turn your engine off by covering the end of your exhaust with a cloth (or something so you don't burn yourself).

<-----> | Mar 05, 2008
Daniel Z | Mar 05, 2008
ahahahahahaha I feel sorry vfor you
guardrailjim | Mar 05, 2008
Maybe the switch is bad.
gixx | Mar 05, 2008
how do you start it?
Moxymoomoo | Mar 05, 2008
Am really sorry I am not sure - but maybe the answer is:- To put on some wellies and rubber gloves and remove the spark plug cap thus causing the engine to stop running. Take great care at all costs not to get a shock especially when returning cap to spark plug prior to next journey. If it were me I would call a nice AA man!!!!!!!!!!!!!!!!!!!!
dirty_jerzee99 | Mar 05, 2008
This happens once in a while on my Vespa. What happens is when you turn the key to the off position, all it really does is turns on an extra ground and basically closes the circuit that runs the bike. What happened more then likely ( as it does on my bike ) the black wire (ground) fell out of the slot on the reverse side of the key cluster. remove any panels and get to the other side of the key. push the wire cap back onto the cluster and it should turn off. Bend it a little if you want to keep it from jumping out again.
sketchyB | Mar 05, 2008
when you hit a kill switch or turn the key off it should short out the spark to ground so it doesn't go to the spark plug. If it's not turning off: -the switch could be bad -there could be a broken wire leading to the switch -if the switch grounds out to the metal on the bottom side where it is connected, there could be rust or paint or something built up under it preventing it from making contact I had a bike where the switch failed, I would put the choke on full and open the throttle wide and it would just die out (or sometimes just stall it). Obviously this isn't convenient, and probably not very good for the bike. It's probably worth it to troubleshoot the key switch so it works correctly (assuming it's SUPPOSED to turn the bike off). If you can get a multimeter, you should be able to see continuity between the frame of the bike and the kill wire when the switch is pressed. Trace the kill wire back from the switch and make sure it's intact and is hooked up correctly on the other end. If you can get an electrical diagram of your bike or a factory service manual it would help with troubleshooting.
Firecracker | Mar 05, 2008
To paraphrase: year, make and model are a big help. Most have a kill switch on the right bar. Turn it off. It stops the engine by grounding the coil (usually). You may have a kickstand switch that you could get by with. Personally, I think the contacts inside the ignition switch are messed up and shorted together. The usual positions are: Park (or accessory) where just the running lights are on. No headlight or ignition. Off where everything is off. Run (or ignition) where all lights and ignition are on.
jessyfoxterrier | Mar 05, 2008
check the fuses , also check the ignition wires
Bailster | Mar 05, 2008
maybe you need a new swich because it is bad:)

Ignition coil wiring diagram - Bookshelf


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The only load devices are a headlight, tail- light, and ignition coil. The magneto has two pairs of wires. Each pair connects to a charging coil (not visible in the diagram). One charge coil powers the CDI ignition unit and the other is used for the ...

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A motorcycle’s electrical system can be daunting to even the most adept home mechanic. And yet, the more complex these systems become—and the more important to a motorcycle’s function—the more useful, even critical, it will be to know something about them. That’s where this book comes in with a user-friendly guide to understanding, diagnosing, and fixing the electrical systems and components that make a bike run . . . or falter.   Veteran technician Tracy Martin explains the principles behind motorcycle electrical systems and how they work. He details the various tools, such as multimeters and test lights, that can be used to evaluate and troubleshoot any vehicle's electrical problem. And in several hands-on projects, he takes readers on a guided tour of their vehicle’s electrical system, along the way giving clear, step-by-step instructions for diagnosing specific problems.


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