hi, got a 1st gen vfr750 fg rc24 1986. got wiring problem ???????. with ign on & kill switch off, motor will turn over & fuel pump is working, but no spark. with the kill switch on it pops the ign fuse. i have a basic knowlage of wiring, but i'm prity good in all other areas. common sense tells me its a bad earth, checked all connectors for power/continutey. all seeems ok.this is really puzzeling me & i've come to a stand still.please help me obi one canobee !!!!!! your my only hope. cheers.DAZ. great forum by the way.:smile: ps forgot to mention that i've got lights, horn & all other electrical bits working fine, but do not have original clocks, just a custom chrome speedo.
You have a short somewhere- look for frayed or chaffed wires. Bad ground shouldn't pop fuses. BTW, an 86 750 is considered a gen 2.
Kill switch on AND pressing the start button? Or just flipping the kill switch alone? The start button is a weird duck on the early machines. It's a two position switch which disconnects the headlight and engages the starter relay, then re engages the lights when released. The switch is prone to problems although I haven't heard of your problem and the switch related. If the lights were on and the starter was turning, it could draw too much amps and pop the fuse.... Otherwise, like Dukie said, a short in the system, wires inside the handgrip that go to the kill switch and starter button "could" ground out against the bars.
thanks for the 2nd gen info, just flipping the kill switch to on pops the fuse straight away, all other electrics work ok, lights, horn etc.i have noticed that a black wire from the fuse box that links the 2 fusebox connectors is geting warm, if i put a higher rate fuse in. I didnt get the original clocks with the bike, so i put a custom chrome one on. i've aslo noticed that a yellow/green wire coming from the spark unit & fuel cut off relay is not connected at the front of the loom, should this be connected somewhere????. checked wiring in h/bar switch gear, all seems ok. i'm builing a CAFE RACER project, so i've dumped the turn signals & fan & put a smaller rad on it, old one was shot, so i've got no fan switch, no tacho, fuel gauge, temp gauge, just the basics. will post some pictures when its built, just this little glitch to sort out & paint it. cheers.
It probably is the start switch. it has 4 wires and one of the wires splits and goes to the kill switch. Actually the start switch should just be two switches. One to start and one to turn on the headlights AFTER it starts. But NO.... they thought you were all too stupid to turn on your headlight during the day so they made this troublesome switch to do it for you. Motorcycles did not used to have that switch. Just look in the kill switch housing and see if you have a broken wire going to the kill switch. And why do you have a kill switch? Because when there was an accident and a good person came to your aid they need a button to turn off the motorcycle which could be still running. But now they have added a KILL switch AND a mercury switch to shut it down when it is laying on the ground. Pretty soon it will be like a BMW. You will get on turn the key and you have to wait while a computer says you will be allowed to start the bike, after all the systems have been checked. and god help you if it ever goes bad!!! And then if you are in trouble with any authorities they can send a signal and disable your vehicle too. And if any item gets disconnected without entering a special technicians code, the authorities will come and lock up bro. Even if it was not your fault. Could just be corrosion or a traffic accident. Oh,..thats a good idea, just disable all vehicles that are in any accident and only the authorities can reset them. Things are getting CRAZZZZZZY!!!!
all quite on the western front all done, the fault was the rear coil terminals were earthing in the bracket,only just spotted that the rubber cover/boot on one of the coil wires had a small cut in it, no signs of burning or arking, but found it strange that the conector woulnd'nt come off, jammed up against the mounting bracket. hit the button for the first time in 14 years & she fired up, no problem:biggrin::biggrin::biggrin: thanks for all your help guys. see you some more.
