Originally Posted by Paul77

I have an 87 trx 125. Just all you it sparks once then nothing. At first I only had the reverse light on on the dash. So I cut the light green with red stripe wire back near the fuse box. You can also access the same wires near the handle bars. I grounded that and got the neutral light to come on and still one spark then nothing. I haven't tested the coil or cdi yet. I've read every thread on the web I could find and it seems like nobody has it resolved.

Originally Posted by Greenbaron

Hello there people. I have a 1988 Honda TRX125 that I got for $100. Well, of course it doesn't run, and I've spent way too much time trying to fix it.

I have the infamous no spark problem. Once in a while it will spark, first time you pull the string or hit the starter - sometimes.

Soooo, I disconnected EVERYTHING and only hooked up the item required for the starter to work and the CDI stuff. It still has the same problem...

So I took my trusty power probe and found that on the CDI Module itself (Igniter?), it receives a pulse signal from the trigger wheel, at least it seems too. The light flashes with positive power whenever I hit the starter, and the pulse speed is in time with the engine.

Now, I know the coil works, and I am 90% sure the trigger wheel is working, the ignitor is receiving all powers and grounds that it should, ( I think). All I want now is a way to test the igniter to make certain that it is the bad part.

Also, I have been searching ebay and the like for a new CDI box, and the 85-86 box is completely different. Mine looks like this one:
http://www.mfgsupply.com/m/c/2...0042.html?id=HEnpZ5vF


But mine says HC3 CI540 on the connector piece. Is there a fiche available where I could check and see which boxes is compatible with which bike? The TRX200 looks like it would work, but I wonder what kind of timing difference there would be.

I believe the part number for my box is 30410-HC3-003, after some searching.

Thanks a lot, LaterZ.