CDI pour XT600

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F.A.Q.

Does the CDI of differents XT600 are compatibles?

Until 1989, CDI of the XT600 models:
34L/55W/43F/3AJ/1VJ/3UW/59X/3SW/36A/5Y1/5Y3/2KF/2NF/3TB(kickstart only),
those of XT550(electrically compatible but not the same advance curve!)/SRX600/TT600 are fonctionnaly compatibles, although connectors could be differents, wiring and colors are differents with sometimes 2 or 3 wires more:
Blue: connected to ground when neutral.
Blue/yellow: connected to ground when sidestand in place (disconnected when sidestand open)
Blue-sky: wire to neutral lamp (2KF wiring).

- Wiring to fit a 2KF CDI on a 55W bike:

• neutral contact (sky blue) connected to sky blue wire
• blue CDI wire connected to sky blue wire from tachymeter
• blue/yellow CDI wire connected to ground.

Caution, since 1990, XT are fitted out with TCI.
TCI from models 3TB(electric start)/3UW/3UX/DJ02/4PT and SZR660/TT600e are compatibles.

Witch are the factory advance values?

On my bike, the pickup have only one coil (one output)

You can use the PIC CDI by connecting only the entry 36°. The XT600 uses the second pickup at 12° for a better starting, but it is not essential.
Ignitions with one sensor use the negative shape from the pickup pulse at kickstart and iddle. The PIC CDI does not use this negative shape so kickstarting will be thus harder.

I own a YaSuHonKa SXF275R, does it works with my bike?

Impossible to answer, because you ask me to know the characteristics of YOUR motor bike...!!
As I don't know (and don't want to know) the electric characteristics of thousands of models (which change each year), YOU must do this work of documentation.
First, begin to carefuly read the technical review.
Thus I'll answer in the broad outline:

• Is it a 2 strokes or a 4 strokes?
• How many cylinders, how many ignition coil?
• Is it a TCI? (ignition coil connect to +12vdc)
• Or is it a AC-CDI? (alternator provides 200Vac approx.)
• Or is it a DC-CDI? (alternator provides +12vac and the DC-CDI convert into 200Vdc)
• How many pulsar are there? (one for both cyl or one for each?)
• How many output on each pulsar? (one output only?, or one output for low and one for high rpm? [like on XT])
• How much voltage does it provide?
• Does the "black box" use the positive shape or the negative one of the sensor?
• At what angle take place the pulsar?
• What is the advance curve?

How to clean up the CDI?

The genuine PCB is embeded in a kind of resin that prevent vibrations, moisture... and reverse enginering!
To remove this mud: use Dimethylsulfoxid (C2H5OS) und Aceton (C3H6O).

Does I gain power?

No. Engineers from Yamaha have the technological to get the max of power of their engine. If they had been able to get 50 reliable HP, they would have done it... but you can modify the distribution of the power (Ex: more advance = more torque at a particular rating) or remove the rev limiter.
Concretely, to tune the advance curve according to the engine/exhaust/carburation/air filter and to gain same HP, it is necessary to compare the result from each curve with a power dynamometer.

TCI versus CDI

"TCI collapses an already charged coil by disconnecting it (TCI switches off briefly). These systems generally use a higher resistance type coil and are known as an "induction" or "Kettering" ignition systems.
CDI sends a brief high (+200volts) voltage pulse to an uncharged coil which act like a transformer and multiplies it even higher. The step up is normally around 100:1. These systems tend to use low resistance or "racing" oils." TCI is Not CDI

TCI and power transistor

The TCI of SR125 is fitted with a 2SD1071
(NPN Darl 6A/450V/40W/TO220 = BU806)

How to test the ignition system?

Alway unplug the component before measuring its resistance!

Models with CDI

Models with TCI

SR 500 Models CDI

XT350 Models CDI

XT225 Models CDI

XT125 Models CDI

TZR125 - TDR125 Models CDI

How to control a ignition coil (CDI type) and spark plug?

Load a condensator of 1uF or 2.2uF on the main supply (220Vac) througt a diode, then connect the loaded condensator to the primary of the coil. A spark appears to the spark plug.

CAUTION: be carreful because of the main power.

How to control a CDI?

You can control if the CDI provide sparks, you can also control the advance with a oscilloscope (first chanel on pin 5, second on pin 7) by mesuring the delay between input pulse and output spark.
If the delay is alway the same at high and low RPM: the advance is out of order!

1,2: High tension supplied by 2 small transformers 220v/9v, connected together by their SECONDARY, to produce a isolated tension for your security. 3: Input of the 12° sensor (unconnected). 4: Common of the sensors (connect to generator ground). 5: Input of the 36° sensor (connect to generator output). 6: ground (connect to ignition coil ground AND sparkplug ground) 7: Output to the spark coil (connect to ignition coil).

The Low Frequency Generator simultate the signal of the pickups. One can make change the frequency (16Hz to 116Hz equal 1000rpm to 7000rpm), the tension, the shape of wave...
In this conditions, with a condensator of 1uF, the spark length in millimeters equal High_voltage divide by 13

ie: 260volts / 13 = 20mm spark length

Aug 25, 2011