Originally Posted by jamieclark22191
Hello I'm not sure if is the right place to be posting this or not, but hopefully you guys can still help. I bought this 93 cbr900rr a few days ago without a tank or seat. Tried starting with starting fluid but got nothing. I have power to both coils but only one is getting the pulsing ground from the cdi. im assuming that since its firing one of the coils that its got to be a bad cdi or wire from there to the non functioning coil. but im not a motorcycle mechanic.. thats why im here. I haven't had a chance to check continuity from the coil to the ignition control unit but will in the next few days. Can someone point me in the right direction if im off track?? i found a 96-98 service manual, is that usable for this 1993? also found a universal electric fuel pump lying underneath the bike. Did these bikes come with an electric pump? Appreciate any help
When you tested spark for each cylinder by grounding the spark plug and firing the start button which ones fired and which ones didn't? These ignition systems are modern, but very simple in design. It's tough to tell be testing continuity and resistance in components, versus real word test as testing spark at each spark plug. Coils can be had on eBay regularly. But, I'll say that older CDI's ICM's or ECU (depending on what you want to call it) failures are VERY rare. Do you have any pics of what you're dealing with? I would love to see them. I was able to (fairly easily BTW) add coil on cap (coil sticks) on my 99 track 900 with eBay parts for under $100. I felt it would eliminate any future "old coil" failures.
And yes, the 93 originally had an OEM fuel pump, but it was a non pressure producing pump, it only helped the fuel along, pulsating in cadence with the ignition, so it only works when the engine is running.
Hello and welcome to the forum Jamie, yes would suspect the coil or the wire leading to it, slight differences between the two, Throttle Position Sensor being one, search the net for the proper one , but here's some fair usage info,
Right on Bill, the ignition systems save for the rogue pink wire and TPS, is the same and should test with near identical procedures and similar results.
Note there are also STICKY wire diagrams for all 900 models here:
Keep us up to date on this, I love to verify and report current information about older coil failures and/or CDI failures. I still have yet to see them become common failures even 26 years later.