86 - 91 CDI Box

[MasterGuns]

Was checking out a box full of "stuff" I've had sittin around for who knows how long and finally sorted through it for a bit. To my surprise I found a complete coil/ignitor (cdi) assembly. Short of installing the cdi box, how would one bench check this thing to find out if it is good? In this very large box is all kinds of other stuff, including a complete motor off an 86 VR. If anyone needs something let me know and I'll see if what you might be looking for is in this box of goodies.

[dingy]

The TCI module will either fit an 84-89 bike or a 90-93 bike.

 

In 1990 the pick-up coil design was changed from a two head unit to a single head unit.

 

They are not interchangeable.

 

The 1983 version had different circuitry due to the location of the vacuum pick-up on the carbs.

 

The 83 unit will allow a 84-89 bike to run, though very poorly.

 

The unit is acually a TCI unit wich differs from a CDI.

 

The TCI units basically have the coils energized all the time, then remove the energy to create the collapsing field which generates the high voltage pulse.

 

A CDI operates opposite this and energizes the coil to create the spark.

 

Below is a link to a decent description of the differences in the units.

 

http://www.jetav8r.com/Vision/IgnitionFAQ.html#a7p0

 

Gary