Motorcycle Repair: no spark, brain control, altenator

Question
this black box you talking about is it about 1 inch sqaure with 2 connections for wire?is it called a rectifier,-------------------------
Followup To
Question -
hey mate how wood you be? i have a 1979 xt yamaha 500cc with no spark to the points.i got a new coil,condensorand battree.my turn sigals work,brake light works and horn work.i could clutch start it a while ago but not now.fuel ok cleaned jets.? hope to here from ya   bob
Answer -
Bob, check the pick up coil. The black box or igniter (CDI)(TCI) unit may be defective.

Answer
Bob,

The rectifier converts AC electric produced by the altenator into DC electirc. It may have two plugs.

The central control unit has many names: black box, computer, TCI, CDI, brain, control module, igniter, and others. This parts is difficult to test if not impossible. Some dealers have a testing device to test this component, most do not.

Send me your email address and I'll send you test files.

Send to my email: mshively1@woh.rr.com

Mark