can anyone tell me how to test and change the pickup coils on an 84 vfr750

Hey guys im still trying to narrow down this problem, i just purchased another wiring harness of ebay, i hope that fixes the probelm, but i still am gonna test the pickup coils, i think i have a used one i got a few months ago, if anyone can tell me how to test the one thats on the bike and how to change i would be grateful, thanks again everyone for all your help, ive been working on this bike for months and want to get it going again, i wont give up, i posted my other thread below where i explain the problem im having thanks again guys!

Razor

Hey guys still no luck with my bike, (84 Honda 750 interceptor) I recently changed the 2 cdi packs, battery, starter solenoid brand new, changed the starter 2xs and the voltage reg/rect 2 times, I cleaned all connections on the harness with contact cleaner and a wire brush. heres the problem the bike starts up fine when cold and continues to run great until I turn it off, it seems after it's hot if I turn it off it wont start, (seems like the starter is struggling when its hot) , it seems to be an ignition prob or electrical short, cause when the bike is hot it wont start and starter shows resistance, but if I disconnect the ignition wires (cannon plug with 5 wires) from the solenoid the starter then turns like a champ but obviously the bike wont start because the ignition isn’t engaged, if I plug the ignition wires back into the solenoid then the starter struggles again. There is one relay that im not sure what it does (the whole relay is covered with a rubber boot its to the left side of the voltage rect.) does anyone know if that relay has anything to do with the ignition or starting system? I couldn’t find anything about it in the Clymer manual either. like I said the bike runs great, I can start it cold fine , but if I have to restart it before it fully cools down it wont start? once its cool again will start no problem and run till i turn it off, The only thing I can think this problem might be from is last year the starter button stopped working so I was jumping the solenoid to start it all the time, but I got tired of taking the side plastic off every time, so I decided to wire a manual switch from the battery to the solenoid it did the same thing as jumping it, worked fine for months until one day the bike was running hot, and the wires for my switch melted on the manifold and got red hot like a toaster oven, the bike still ran after this, but always had trouble starting that’s why I changed 80 percent of the electrical components, does anyone know any components in the ignition line that comes from the solenoid that I might have fried when this happened that would cause the problem I have been having? please someone help, I have been trying to get this going for months now, thank you for your time< you guys have all been a great help!

Razor

 

Brother...I have no idea, but I'll tell you what, its probably something simple.

The only thing I can recommend is this book "Motorcycle Electrical Systemsiagnosis and Repair" by Tracy Martin

Here's the link Amazon.com: Tracy Martin

Great book! Easy to read and helped me more than once. I recommend it to all VFR owners. Tracy explains everything in plain terms.

BZ

 

One thing confuses me about your description. To my knowledge...there are no ignition wires that go to the starter solenoid. You need to find someone that can troubleshoot elecrical using voltage drop. This is a way of precisely finding out how much VDC any component is consuming under load. Using this troubleshooting method, you could find out where your battery voltage is going when your bike is failing.