What is this on my yz125???

Question

i bought it used. it's 2006.

it has a black square box on the part where the frame meets with the forks. hanging from this are a few wires. it looks like this: http://cgi.ebay.com/ebaymotors/1984-Yamaha-YZ125-YZ-125-CDI-Igniter-Box-Excellent_W0QQcmdZViewItemQQcategoryZ35594QQihZ009QQitemZ190242624288QQrdZ1QQsspagenameZWDVW

what does it do?

Answer 1

CDI (capacitor discharge ignition)

motorcycle batteries are extremely small this allows for the battery to send off a higher charged current to the spark plug, without draining the battery faster then the stator is capable of recharging.

you can't run your bike without it, since this peice is responsible for sending the current to the spark plug in the first place..... without it the current will never reach the plug.

Answer 2

dude its the CDI, you need that to run your bike.

Answer 3

CDI

Answer 4

that sir, is the flux capacitor