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Jul 27th 2017, 05:19 PM   #1
 
  Jul 2017
  Greenwood

Suzuki TM75 Electrical problems

Hello peoples! my first post here, hope to get some helpful info!

I bought a little TM75 for $100. The problem seems to be electrical. It gets spark, SOMETIMES.

When I fiddle with the kill switch while kicking it it will spark if i fiddle with it just right but when i unplug the kill switch completely or stop fiddling with it, no spark. this makes zero sense to me!

brand new plug. if it sparks sometimes that would mean that the CDI and Magneto are fine, yes?

pretty stumped. any info or ideas to get this hundred dollar headache running is much appreciated!
Jul 27th 2017, 06:52 PM   #2
 MarvTravis's Avatar
 
  Jan 2016
  Kirkland, WA

  Kawasaki ZX-14
When the kill switch is in the 'RUN' position, the switch contacts would be closed. When the kill switch is in the 'OFF' position, the switch contacts would be open.

That you get no spark when you unplug the plug the kill switch makes sense, because that's the situation when the switch is in the 'OFF' position.

If you were to short the contacts to the kill switch, that's the situation when the switch is in the 'ON' position. Temporarily short those contacts and see if you get spark. If you do get spark, the kill switch is intermittent in the 'RUN' position, and you need to replace the kill switch.
Aug 14th 2017, 06:11 PM   #3
 
  Jul 2017
  Greenwood

Thank you for you detailed reply, it helps! How exactly would I short the connections? I bought a new kill switch and still the problem remains (spark only whrn I release the kill switch and kick it in the perfect spot). Although the new kill switch has a ground wire unlike the old one. I hooked it up to a frame bolt buy seemingly the same as if it weren't connected at all.

Coil? Stator?

Thanks everyone!
Aug 14th 2017, 06:25 PM   #4
 
  Jul 2017
  Greenwood

Also the damn petcock won't stop leaking
.not sure what to do about that. Haven't looked eBay..
Aug 14th 2017, 06:43 PM   #5
 MarvTravis's Avatar
 
  Jan 2016
  Kirkland, WA

  Kawasaki ZX-14
It may be that you have an intermittent connection in the wiring to the kill switch. You need continuity in the wiring, and through the kill switch. If you're certain the new kill switch is good, (verified by a multi-meter), start tracing the wires from the kill switch and see if you have good continuity to wherever they go.

That you get spark sometimes by wriggling the kill switch, there must be a poor connection somewhere in that circuit.

There are most-likely two wires leading to the kill switch. Disconnect these two wires from the kill switch, and connect them together with an alligator clip, (isolated from anything else), and then see if you can get spark. If not, then the kill switch itself isn't the culprit. If you wriggle the connected wires and you can get spark sometimes, then you have an intermittent in the wiring to the kill switch.
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