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Author Topic: XS750 No spark  (Read 576 times)

Offline Sonreir™

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Re: XS750 No spark
« Reply #15 on: May 17, 2017, 00:57:56 »
That's a little high, but should still be workable.

Next step, turn everything on and measure voltage on the open side of each point (when it's open).
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
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Offline interceptor

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Re: XS750 No spark
« Reply #16 on: May 17, 2017, 09:57:02 »
I was wondering if you've actually had your battery tested to make sure it's up to par?
Opinions are like farts... they stink and no one wants to hear it except yourself.

Offline DonCamalot

  • Posts: 15
Re: XS750 No spark
« Reply #17 on: May 17, 2017, 12:08:08 »
That's a little high, but should still be workable.

Next step, turn everything on and measure voltage on the open side of each point (when it's open).

Voltage is reading 10 from where the coil connects to. And open it slowly decreases to .003+_
Thanks again for you continues help!

Offline DonCamalot

  • Posts: 15
Re: XS750 No spark
« Reply #18 on: May 17, 2017, 12:08:37 »
I was wondering if you've actually had your battery tested to make sure it's up to par?
Yeah the battery is reading properly and fully charged.

Offline interceptor

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Re: XS750 No spark
« Reply #19 on: May 17, 2017, 12:17:48 »
Ok.  You did a load test, or you just measured voltage?  Not sure if it really matters, but never hurts :)  And did you happen to install an aftermarket reg/rec?
Opinions are like farts... they stink and no one wants to hear it except yourself.

Offline DonCamalot

  • Posts: 15
Re: XS750 No spark
« Reply #20 on: May 17, 2017, 22:00:04 »
I measured the voltage.
It's a stock regulator but I have a new one coming in.
I tired it with the kick starter and still nothing. It's almost like the Cam is spinning too fast. What's the difference between me opening it with my hand vs the cams opening it? Do the wires need to be grounded?
« Last Edit: May 18, 2017, 01:22:17 by DonCamalot »

Offline interceptor

  • Posts: 822
Re: XS750 No spark
« Reply #21 on: May 18, 2017, 05:58:28 »
Voltage is reading 10 from where the coil connects to. And open it slowly decreases to .003+_
Thanks again for you continues help!
  I just re-read something from before.  You stated you only have 10 volts, but you need 12V + at the coils to excite the second windings in the coil. Your not getting enough voltage to the coils.  I think your battery may need to be replaced with a new one?  Just a thought  ;)  I have a buddy who owns a Battery Giant, and they can test your battery for you.  It only takes a minute to do.  Good luck  :) 
(BTW, this is a really good video explaining what i can't.) 

Opinions are like farts... they stink and no one wants to hear it except yourself.

Offline Sonreir™

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Re: XS750 No spark
« Reply #22 on: May 18, 2017, 13:20:08 »
Voltage is reading 10 from where the coil connects to. And open it slowly decreases to .003+_
Thanks again for you continues help!

Up next, resistance from the the plug cap through to the positive side of the ignition coil. This should read somewhere between 15,000Ω and 25,000Ω.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

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Offline Garc

  • Posts: 16
Re: XS750 No spark
« Reply #23 on: May 18, 2017, 13:51:47 »
Interceptor is correct.

10 Volts will not allow an XS750 to provide adequate spark for combustion.
XS 750/850 Triple Shaftjacker

Offline DonCamalot

  • Posts: 15
Re: XS750 No spark
« Reply #24 on: May 18, 2017, 23:34:03 »
All the coils are putting out around 20k resistance. I tested Ampers and the third point is giving me 1.2, when I press the ignition. The other two are giving me .6-.8. I'm taking my battery in for testing tomorrow. Any other ideas? What controls the ampers through the ignition and points? I'm pretty desperate Haha
Thank you again for the help.
« Last Edit: May 19, 2017, 01:00:55 by DonCamalot »

Offline interceptor

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Re: XS750 No spark
« Reply #25 on: May 19, 2017, 08:19:12 »
From what I know, amps are controlled only by what is calling for it.  (A starter motor will take a lot of amps verses a headlight.)  Batteries have an amp hour (ah) rating, and batteries that are not in great condition may show 12 volts, but the amps will diminish quickly.  That's why having the right battery for your bike is so important.  On the flip side, if you ad a bunch of accessories, your charging system may not be able to keep up with the amps being used.  So I believe you would then have to replace parts in your charging system. 
Opinions are like farts... they stink and no one wants to hear it except yourself.

Offline Sonreir™

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Re: XS750 No spark
« Reply #26 on: May 19, 2017, 13:53:23 »
Amps used by a component is determined by the voltage in the system as well as the resistance in the component. Ohm's Law: I = E / R. I is current (amps), E is voltage, and R is resistance.

If the resistance is too high, the amps will be low. Not enough current to the points is usually a bad/corroded connection somewhere, possibly even bad wiring after all this time.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline interceptor

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Re: XS750 No spark
« Reply #27 on: May 19, 2017, 14:45:43 »
Amps used by a component is determined by the voltage in the system as well as the resistance in the component. Ohm's Law: I = E / R. I is current (amps), E is voltage, and R is resistance.

If the resistance is too high, the amps will be low. Not enough current to the points is usually a bad/corroded connection somewhere, possibly even bad wiring after all this time.
Oh, I think I see where you were going with testing the resistance now.  My thinking was that the battery test would be the easiest thing to do since he was only showing 10V ;) 
« Last Edit: May 19, 2017, 14:49:18 by interceptor »
Opinions are like farts... they stink and no one wants to hear it except yourself.

Offline DonCamalot

  • Posts: 15
Re: XS750 No spark
« Reply #28 on: May 19, 2017, 22:58:04 »
Finally figured it out. It was a combination of the kill switch being completely rusted, and some wiring around the points. Thank you all for your help!!
Now, if you can guide me to a guide on how to time the points- a completely dumb edition- I'd much appreciate it!

Offline interceptor

  • Posts: 822
Re: XS750 No spark
« Reply #29 on: May 20, 2017, 06:41:15 »
Sweet!  It`s a great feeling when you figure something out like this :)   Good call Sonreir!  Now I know what to look for on my own bike - It`s kind if doing the same thing  :o. I`ve done the points setting in the past, but I`m not sure I can help you all.   I`ll let someone who knows what they are doing help. Would you happen to own a service manual?  It`s usually shown how to do it in there .
Opinions are like farts... they stink and no one wants to hear it except yourself.