[Jamesorcutt99]

My 2004 GSX-R600 When I try to start it all 4 plugs will spark 2 tines they cycle twice then no spark. It happens every time. I'm wondering if it would be my wiring harness or CDI? I would be greatfull for any help thank you. Sorry I'm kinda new to working on them and diagnosing thank you

 

[BillV]

Are you getting any fault codes? That sounds like a faulty CKP or CMP sensor but they should produce a fault code. Unplug the ECM connectors and look for corroded or broken pins.

 

[MikeyD21100]

Most times no code for faulty crank trigger. If you know someone with same bike it would be great to swap parts to test.