Yz 125 1991 no spark

SOURCE: cdi box

there a mounting spot between the radiators its a perfect fit for the slot on the box and its a tight fit

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: 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

Greg O'Day

• 376 Answers
• Posted on Oct 16, 2009

SOURCE: no spark, changed the coil, is there any way to

There is a way to test a CDI box but you will have to take it to a shop that has the equipment to do this. I own a motorcycle/Atv repair shop and I don't own one cause they cost allot and I can't justify getting one.

SOURCE: Have no spark. Changed coil & CDI box so far.

Hi and welcome to FixYa,
Initially, suggested checks on the wires:

• black of igniter unit tied to ground;
• orange wire from igniter to ignition coil with pulsating voltage when starting;
• gray wire from igniter to ignition coil with pulsating voltage when starting;
• IGN + 12 on red/white wire to igniter and ignition coils from engine stop switch;
• IGN + 12 on red/white wire to engine stop switch coming from 10Amp ignition fuse;
• pulsating low voltage from pickup coil between the wires black/white, white/green & yellow/red.