trx300 4x4 changed CDI now dont start - Honda ATV Forum
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post #1 of 18 (permalink) Old 01-08-2017, 06:29 PM Thread Starter
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Angry trx300 4x4 changed CDI now dont start

91 model I recently got for my son. it needed a lot of work, but we got it running without much trouble. However, it had an intermittant problem as it would die after running for some time. If I wiggled the cdi box, it would restart and run awhile longer. the wires were cracked and broken at the back of the plug so I ordered a new cdi box that came with a new pigtail, but the wires were different color. no problem, I just wired it back in the same position as the old one and soldered the connections. It would not fire up. No fire to the plug. I download a repair manual and follow the instructions for checking the cdi module and find that the neutral safety switch has continuity when the manual says it should not. even if I unplug the wire from the switch at the bottom righthand side of the engine, it still shows continuity to ground at the cdi. Sounds like the wire is shorted to ground, right? Can I run a jumper wire from the cdi straight to the neutral switch? Im wondering why it suddenly went bad, it ran pretty good before, other than the shutting off problem. I made a small problem into a major one.
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post #2 of 18 (permalink) Old 01-08-2017, 07:12 PM
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your turning the key on, and your not getting a neutral light on the dash ?, if the neutral light is not coming on ?, it won't fire at all. the neutral switch must be hooked up at all times. turn the key on ( this is for testing only ! ), touch the neutral wire to the engine/frame for ground, light come on then ? if so ?, you either have a bad nuetral switch ( common problem ), or, a bad diode under/inside the black box under the handle bars, 10mm bolt holds the plastic door closed, the diode is inside there. pull it out of the connector, take a paper clip, install it in the connector ( this is temporary ! ) turn the key on, neutral light come on then ?, if so ?, the diode is bad. and welcome to the forums.

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post #3 of 18 (permalink) Old 01-08-2017, 07:33 PM
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Where did you get the new CDI with a wiring pigtail that didn't match the factory wiring??


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post #4 of 18 (permalink) Old 01-08-2017, 07:37 PM
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Quote:
Originally Posted by cmanningjr View Post
Where did you get the new CDI with a wiring pigtail that didn't match the factory wiring??


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there is an after market pig tail to use on revised c.d.i's, but I don't know if his c.d.i is after market ??.
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post #5 of 18 (permalink) Old 01-10-2017, 06:43 PM Thread Starter
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It is an aftermarket CDI from ebay. The neutral light comes on but doesnt fire at the plug. I even tried the old cdi that worked, although inconsistently, and still no fire. next, I will check the run/kill switch with ohm meter. anything else to check? Thanks for the welcome and help!
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post #6 of 18 (permalink) Old 01-10-2017, 06:47 PM
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Personally I would try to get an OEM CDI. Aftermarket CDI's are hit and miss..

Have you tried tapping on the original CDI while trying to crank it??


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post #7 of 18 (permalink) Old 01-10-2017, 07:01 PM Thread Starter
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I'll get to work on it tomorrow night, so I can try that then. Thanks
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post #8 of 18 (permalink) Old 01-11-2017, 07:24 AM
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Bought a cdi off ebay, same problem you're having. As soon as I plugged in the aftermarket cdi I didn't have a neutral light. I plugged in the original cdi and had neutral light. Get you an original OEM or Ricks Hot Shot CDI. They are the only ones that are any count.

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post #9 of 18 (permalink) Old 01-11-2017, 06:54 PM Thread Starter
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The thing is.... I have the neutral light on but no spark at the plug. I ohmmed the kill switch, it works fine. I changed back to the old cdi and nothing. Neutral light is still on and it will go off when I put it in gear. Going back to my first post - the manual says there should be no continuity{open circuit}on the green wire to ground when the shifter is in neutral. This one has continuity to ground like there is a short in the harness to ground. even if I disconnect the neutral switch connection at the transmission, i still get the closed circuit at the cdi. HELP!!!!!!!
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post #10 of 18 (permalink) Old 01-11-2017, 08:14 PM
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the neutral light is '' hot '' at all times when the key is on, and your in neutral, once you shift to another gear, your grounding the neutral wire, and this is what turns the neutral light off.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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