9 out of 10 times, if they start by kick starting ?, but wont by electric start ?, then the c.d.i. is junk, buy a oem c.d.i.. be done with it.Well i have a 89 trx400 2wd the problem that I'm havong is that the trx has no spark while trying to start with the starter but bike will start and have spark if i kick start it... has a new cdi also a new battery..