SOURCE: 83 yamaha tt600e no spark
The CDI unit on the 83 model (TT600) is located under the fuel tank and suffers from heat
exposure.The solution is to get specialist help to open up the sealed CDI unit and repair/
replace internal connections (which are readily available electronic components)
When you re-install it put some heat shielding material there to protect it and this
will be OK as repair will utilise stronger parts,I think.
Later models have the CDI unit moved to the head-stem area.
(this info from a Non-mechanic who remembers what was done to his TT in Australia, many years
ago)
SOURCE: 1987 Honda shadow vt1100c no spark at any plug
The voltage on the coils is present except at the instant of firing. The interruption of the voltage is what causes the coil to fire. The cdi box is what causes the voltage interruption.
The interruption is very hard to detect. You are not the first to be stymied by that box. If you have access to an oscilloscope, I think you can see the pulse if it occurs.
SOURCE: yz125 no spark
G'day i am a . YZ 125 j ...lets see now! You could perform these tests yourself.Check your plug CAP,if in doubt replace it with a new one. Take the below ohm figures and see if they match up. Pulse coil: white/blue and white/red= 310 ohms. low speed coil: Green/white and Black/red= 900 ohms. high speed coil: Green/blue and black= 55 ohms. hope this has helped in some way to helping you solve your problem.If it has please leave feed back.Ride hard , see ya,Tabbycat
SOURCE: hi i have an 05 crf150f it wil not get spark at
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
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