Hi All, Having trouble trying to get my ZXR to run since fitting a new loom, CDI and various other bits. Everything basically works, but there is no power going to the coils (as far as I can tell). I'm trying to eliminate possible issues and am now needing help. I have followed the wiring diagram and images as found on this site, but am still not any closer to getting a spark. I have an A model ZXR250 that I'm using as a guide, but there are some differences. Can someone confirm some/all of the following? 1. Flasher relay earth - my A model flasher does not have an earth, but the C model loom does (see pic). Is this earthed to the frame, engine or negative on the battery? 2. Pickup position - Can some confirm if the yellow wire is on the left or right hand side coming out of the engine? 3. Earth points - I have earthed the battery to the engine and the starter to the starter motor. However, the loom I have also had a separate earth wire that doesn't appear to have anywhere to go. Is there anywhere else that C models have earths? Thanks
The battery should be earthed to the frame/engine anyway, so it should not really matter where you earth it. If it reaches the battery it could go on the negative terminal, but I'd be finding somewhere within reach on the engine or frame to earth it. If you have a spare wire you could always bridge the gap between this wire and the -ive terminal to test it. At least then you know it works, and you can find an earth spot somewhere else later. As for 3, are you sure it's an earth wire? where does the other end of it go?
My 2c 1. Flasher relay earth - my A model flasher does not have an earth, but the C model loom does (see pic). Is this earthed to the frame, engine or negative on the battery? - negative on the battery terminal. 2. Pickup position - Can some confirm if the yellow wire is on the left or right hand side coming out of the engine? If you are sitting on the bike,from memory you will see 2 wires come out the engine side cover to a plug, they are the for the pickup coils, you will also see a single blue wire it will have a round loop on the end and is or the oil pressure switch, on the left hand side, you will see a group of 3 wires for the stator and another single green (i think) wire for the neutral selector and a yellow for the temp sender off the head. that should be it for the engine. 3. Earth points - I have earthed the battery to the engine and the starter to the starter motor. However, the loom I have also had a separate earth wire that doesn't appear to have anywhere to go. Is there anywhere else that C models have earths? The engines earths to the frame by its design, but there should be a 10mm bolt on the top of the crankcase (underneath the airbox), about 5cm behind the starter motor, the earth strap attaches there. Thanks
Stu, it comes off the negative connection to the battery. It looks like a secondary earth (it has the earth yellow/black coloured wire). I don't have anything like this on my A model.
Hey Chris. Yep, done all that. Will connect the flasher earth to the battery negative tonight and see if that does anything. Might change the pickups as well since that's the only thing from the original bastardised wiring configuration that hasn't been changed. I did a resistance check from the pickups to the CDI and it's all good, but I'm wondering if maybe there's something knackered in the way it connects and the CDI isn't telling the battery to send power to the coils. It's so frustrating. Every effing electrical thing on the bike works except power to the coils.
Chris, I had a mate come over last night to try and help get the ZXR drag bike running. He knows bikes a lot better than me + a fresh set of eyes etc. He couldn't get it running either, but he did show me that there is power getting to the coils (the RED wires have power when the ignition is on and the kill switch is set to RUN). With the kill switch set to off, there is no power in the RED wires. He also confirmed that there is a signal coming from the pickups, but no signal coming from the CDI to the coil wires (GREEN wire and BLACK wire). He checked all the areas that might cause the bike to not earth properly and feels they are all good. He's not an electrician, but he does feel there is something not right between the CDI and the coils. He checked the CDI and everything was "right". I'm thinking of cutting the loom to see if any wires are broken. Do you recommend this? What do you think? Cheers Frank
Hey Frank I hate cutting looms, can you identify the offending wire in the socket at each end ( ie coil to Cdi) and use a multi meter to do a continuity test, ie when you connect probes of a meter together, the unit goes beep, so the same, but with the probes into the connectors in the harness That will tell you if the harness is okay. Once you have it beeping, move the harness around in the frame and see if the beep stops, that will tell you if a wire is broken Chris
Thanks Chris. I'll try that. I'll have a look at the wiring diagram and see if I can determine which wire is which.
