No spark 81 xj650

Alright guys so I've got no spark to any plug today.. the other day my bike fell ..don't ask I wont tell.. but before it fell everything was working semi okay it all the lights worked and would fire right up and idle as normal

after I picked the bike up I let it sit for a little while and it wouldn't fire I checked the plugs and idk how it ran before worst plugs I've seen
I get new ones and plug em in and still nthn before I could test them the ignition button went out ..it was weak anyways I knew it was gonna happen..
I bought a push button switch today wired it in and nthn happened I can jump cylanoid and it'll turn over but doesn't get spark
I looked at the wiring diagram and seen ignition was connected to the headlight I hooked that back up and the button works but the light does not I'm thinking the light might have broke when it went over
So really I'm curious to know as if the headlight being broke would somehow stop the spark plugs from getting spark like some sort of safety type thing

 

The headlight has nothing to do with the ignition circuit. The ignition circuit just triggers the headlight relay to turn the headlight on.
Which side did it fall on?
Check your sidestand switch. That interrupts the ignition circuit when the sidestand is down. The switches can stick sometimes.

 

Youre right idk what I was looking at but still the button I wired in right off the old switch wouldn't do anything until I plugged the headlight in is it not supposed to be like that?
It did go over on the sidestand side wheres that switch located at?

 

The sidestand switch is mounted just behind the stand it has a small plunger covered by a rubber accordion . Have you checked all your fuses one is for the ignition, have you upgraded to blade fuses or do you still have glass fuses? You should check these carefully the old fuse blocks usually are the problem with the age of our bikes , even if fuse is good the contact points on the block might not be making good contact.

 

Yeah I've checked all the fuses all appear to be in good working order I have not got them changed over yet i do have the block to change it just waiting till I have enough time to rewire the entire bike I'll have to look for the switch tonight and check to make sure it's working properly

 

Go ahead and check for continuity at the fuse clips. Often times they get small cracks and no longer conduct, or have intermittant contact. A good fuse does not indicate a completed circuit in that case.

 

What do I test continuity with?

 

An ohm-meter. A decent toolbox-home-use-grade multimeter can be had for about $12.00 at any hardware store.

 

You can test using a multimeter. We use Fluke testers at my place of employment for testing network gear, but any multimeter will work. Here is a link to Fluke's how-to page. There is probably something on this site specific to testing on an XJ, but this should get you started.

http://en-us.fluke.com/training/tra...for-continuity-with-a-digital-multimeter.html

 

An 81 will not have the side stand safety etc. The TCI is fed from the engine stop switch directly. There's nothing else to interrupt it.

Check for 12V on the R/W wire at the TCI connection. If you have that then you need to look at the coil and pickup connections. If not, then look at fuse box connections and key switch/engine stop switch connections.

 

DOH. forgot this was an '81. good catch.

 

My bad ...my Seca 750 is different ...I'm not worthy

 

Quick thought. Are you using a flooded battery, or a sealed battery?
If she tipped over and you have a flooded battery, some acid could/would have drained while the bike was taking a nap. There could be enough loss to cause the batttery voltage to be low, in which case there would not be enough left over after the starter spins to allow the TCI to function.
Check the battery acid level, the resting battery voltage, and the voltage drop when you thumb the starter.

 

Idk what kind of battery it is I know it doesn't really have a charge by itself it'll kick the lights on and maybe a click or two but that's about it pretty much a brand new battery tho when I originally bought the bike I had to rewire all blinkers and running lights testing them is what brought my battery down I didn't get a chance to take bike out on the road to charge the battery back up so I've been jumping it to test plugs and such since I don't have a battery charger

I have a brand-new multimeter still in the package somewhere just gotta track it down never had much use for it

I can tell y'all this without even being around the bike that most of the wire connections are not acceptable in my standard meaning they are either getting dull rusty corroded they're not pretty

Here in a couple hours when back I'm able to get to work on it I'll test and find out more info and get back thanks for all the help so far

 

So from what you're telling me, I'm going to tell you that the main problem is that your battery isn't charged. Charge it.
Maybe even take it in to have it load tested just to be sure that it's still good after the spill.
There is no way that you will get spark with a low battery, even if it can still spin the starter. The TCI requires a minimum of 10 volts to function. The starter drops battery voltage to near 10 volts even when the battery is fully charged.

 

I trickled charged the battery to 100% last night and just got done testing still no spark
I didn't get a chance to track down where the juice stops at so I'm still about the same spot I was
Hopefully I'll have time tomorrow to run the battery by and get it load tested

 

Dang

If the battery load tests OK then I think you're down to the least-fun part of electrical troubleshooting; taking a meter to every wire and junction one circuit at a time.

 

That's a lot I think I'll switch it over to the minimal wiring that I need at that time as well as get a new starter or rebuild the one I have bc it's going out and get a couple new ignition coils and wires ..a couple of the wires now look a little shady kinda rusted to hell at the contact point with the plug