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Thread: TRX 70 spark issue

  1. 04-07-2016, 02:49 AM #1
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    Tomcall
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    TRX 70 spark issue

    I have an 86 trx70 project. New stator, ignition, cdi, cylinder, piston and head. Before the new cylinder and new head it would start but smoked like no tomorrow. I had replaced the rings on the old piston, still smoking like a the old misquote trucks. So new head. It is all stock set up. So now I get spark in the ignition wire, but not from the spark plug. Brand new plug. Switched it out with a plug I know works from my 250sx and still no spark from the plug. So what's the deal? This seems crazy
    When I check continuity from one plug end to the other I get no reading on either plug. Normal? Any thoughts please.
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  2. 04-07-2016, 07:00 AM #2
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    danbur55
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    bad spark plug cap ??
    you know whats right therefore you know what is expected
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  3. 04-07-2016, 10:22 AM #3
    86125m
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    yea probably just a bad cap if your getting spark from the wire. any cap should work so try that and report back.
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  4. 04-07-2016, 10:41 AM #4
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    yaegerb
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    Unscrew the plug and cut 1/4" off of the plug wire and then screw the cap back on. See if you get spark then.
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  5. 04-07-2016, 12:44 PM #5
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    Tomcall
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    Funny thing is I pulled a cap off a trike that I know works and it didn't work either. And I have cut back the wire as well to get a fresh place to screw the cap on. Does anyone know how to test the caps with an amp meter and what the readings for a good cap vs. bad cap are?
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  6. 04-07-2016, 01:03 PM #6
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    danbur55
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    Hmmm bad plug wire making contact internally when holding plug to head , or bad connection at coil?
    you know whats right therefore you know what is expected
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  7. 04-08-2016, 05:09 AM #7
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    Tomcall
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    Is the 86 TRX70 a 6volt or 12volt system?? I took readings on my ignition coil, new ignition coil and it has readings that correlate to a 12v coil. Am I trying to use a 12v coil on a 6v system??
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  8. 04-09-2016, 12:03 AM #8
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    Tomcall
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    I now see it is a 12v system. So, the ignition tests out ok. And I found a spark plug cap that tests out ok. Had some carb issues to fix and then try again
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  9. 04-11-2016, 03:49 AM #9
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    Tomcall
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    Ok, got spark ok now. New issue. will start a new thread for that one.
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