no spark

evening guys ive just bought a battery to test my vf500f2 out and it turns over but no spark is there any know faults with these i think i HT lead has failed but i cont know it its the coils or what? what doesnt help is that i had to bypass the starter switch to get her to turn over any help much appreciated

 

You are making it turn over directly at the starter?? If so are the key and kill switch on? Have you checked the fuses?

 

i pulled the wires from the plug at the switch if you get me? ill take a pic and post it in a sec and you can all see the sorry state she is in too

 

this is my bike atm and the 2 wirse i took out of the back of the plug to get her to turn over

 

First thing you need to do is check that you have power at the coils with the ignition on. Test light or multimeter is needed for this

 

nothing at the coils with the ignition on any ideas?

 

Main 30 amp fuse? Probably looks like a thin flat metal piece held by a screw on each end.

 

yeah thats intact and i seem to recall all the others are intact too, i have bought some new coils and leads off ebay just to be sure and so i have spare because i think a couple of the leads are fucked i have checked 3 out of 4 leads to see if they spark and nothing on those

 

You will never get spark from any coil if you have no 12 volt power to it, no point in jumping all over the place. Run a temp wire to one of the positive coil wires and I think that should put power to all the coils, then see if you have spark

 

okay cheers mate ill give it ago tomorrow if im not too hung over lol

 

Nic, I'm not sure if powering straight into the coils will put power to the CDI unit, it might it might not. I would put the 2 wires back into the connector and then using the test light/meter see if you have power to the ignition switch. The loom doesn't appear to have been mutilated so that shoulsn't be the cause, it could be something as simple as bad contacts in the ignition switch. Kill switch can also be a problem, if it is turned off you will not get spark to the coils

 

luckily i had a spare switch from a old vfr in the shed so i tried that and the kill switch and start button work fine in the original it was a blown fuse i must of done it when i added the battery or something she turns over but no volts at the coils any suggestions?

 

Nic you have to go back to the ignition switch and see if you have power to it, then see if you have power coming out of it Same with the kill switch. When you turn the ignition on do the dash warning lights come on?

 

turn the key the neutral light and the oil light is lit up a friemnd said to try the clutch switch see if that has a cut on it if you dont holid it in ect but nothing happened so maybe cdi or rectifier?

 

Nic, you have proven that you have power to the switch so now you have to test power out of the switch. Nothing to do with the clutch, that would only stop it from cranking, not stop the spark. Now the ignition light is on do you have 12 volts at the coils? Forget about the rectifier at this stage has nothing to do with power to the coils. I don't think the CDI at this stage it only causes the pulses to the neg of the coil to give a spark but if there is no power there to start with nothing is going to happen. You have to start tracing from the ignition switch to see where power is going. Are you 100% sure that the kill switch is working,this will knock out power to the coils, pull it apart and test across the wires, you must prove you have power running through it.Is the starter button working ok, I think that was why you pulled the wires apart in the connector originally? if not while you have the kill switch apart check the contacts for the starter switch. If it was easy everybody would be riding old bikes.

 

sorry for the delyed reply work and all that what ill do when it stops raining long enough is take the switch apart and give it a good clean ect and see if anything is broken i do have a vfr800 switch gear which ill try see if that kill switch works what do you think? i also have new spark plugs so should help when it does eventually spark

 

she now lives! well sort of sprayed easy start in the carbs to get a pop and it worked although now i have another issue is there a difference in the fuel tanks at some point i bought 1 from the internet and didnt think about looking at how the fuel tap is mounted and both tanks i now have are different the original is 1984 and i think the 1 i bought is 1986 it didnt have a fuel tap so not sure. any one shed some light what would be best to do? i think my fuel tak is a bit far gone as i can shake the rust inside it like a maraca unless i flush it out and get it sealed? r is it easier to buy another?

 

Nic, always a problem putting fuel into unknown tanks, unless you have cleaned them you can pull all sorts of crap into the carbs. To get it at least running I would pull the tank and use a remote fuel bottle hooked straight into the fuel line going to the carbs. Get it running and then sort out the tank issues