How do i check my cdi on a xj 900

SOURCE: 1983 yamaha xj 650 no spark already changed the

• Do you see spark? If not, check the side stand kill switch. It kills the engine so that you don’t start out with the side stand down. If broken or out of adjustment, it would kill the spark. Check for a broken wire at the side stand switch and coupler. Try moving the side stand kill switch by hand. If that doesn’t work then wire a jumper around the switch to bypass it.
• Is the handlebar kill switch on? Is it shorted out?
• Are you getting power to the coils?
• Check the fuses. How good is the battery? Try a jump start from your car battery.
• Check the operation of the ignition switch and all kill switches with a volt ohmmeter. Check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? Is the bike in neutral and the neutral light is lit up? If no neutral light, check the neutral switch and neutral switch wire on center or side casing. If still no spark, get CDI system and coils checked at the dealers shop.

gavin jones

• 1508 Answers
• Posted on Jun 12, 2010

SOURCE: I have an xj 900f but have no spark. I have

Hi I dont have the exact resistances for the pick ups but a kawa around the same era is 400-500 ohms and I suspect the xj shoud be similar.
It is unlikely both pick ups have failed, but they will both need similar resistances to each other, and infinate resistance to ground.
You can somtimes check by touching a screwdriver to them to set off a spark, but as you have no spark to either coil , this wont help in your case.
It sounds like a power supply problem as they both dont work. Check the throttle kill switch, and the ignition switch. When the key is turned off, it switches a wire to ground the same as a kill switch, to stop the motor, so it may have an internal problem