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I have a 1990 Fourtrax 300 and suddenly I've lost the spark. Purchased a CDI box from eBay and put it on over the weekend and I still don't have any spark. What else should I check/replace?
 

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is the neutral light on , on the dash ?, did you buy the c.d.i. from a dealer off ebay ?, or was it some china product ?, if it was not oem from honda ?, then that explains it.
 

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is the neutral light on , on the dash ?, did you buy the c.d.i. from a dealer off ebay ?, or was it some china product ?, if it was not oem from honda ?, then that explains it.
Yes, the neutral light is shining white on the dash.

I bought this CDI. Did I buy the wrong one? https://www.ebay.com/p/CDI-Box-Ignition-Coil-for-Honda-TRX-300-Fourtrax-FW-1988-1989-1990-1991-1992/18026824170?iid=263478697985&chn=ps

How can I test this new CDI to see if it's defective?
 

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That's not a honda cdi....
 

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is yours two wheel drive or 4 wheel drive ?.
 

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Not to be a tightwad(but I really am so i'm not going to apologize... LOL), but this is like 10x higher than the one i bought from eBay. While I don't mind spending the money on it if this is truly the bad part, but what steps can I take to ensure that the CDI is truly bad? How can I test my original one?
there is no way to test them, they are either bad ?, or good ?. if your complaining about why you paid less for it from ebay ?, THIS SHOULD TELL YOU SOMETHING !. those aftermarket china knock-offs ARE CHEAP FOR A REASON !!. tighten your damn belt a few knotches, suck it up butter-cup..AND BUY THE RIGHT C.D.I. !..LOL.
 

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Not to be a tightwad(but I really am so i'm not going to apologize... LOL), but this is like 10x higher than the one i bought from eBay. While I don't mind spending the money on it if this is truly the bad part, but what steps can I take to ensure that the CDI is truly bad? How can I test my original one?
there is no way to test them, they are either bad ?, or good ?. if your complaining about why you paid less for it from ebay ?, THIS SHOULD TELL YOU SOMETHING !. those aftermarket china knock-offs ARE CHEAP FOR A REASON !!. tighten your damn belt a few knotches, suck it up butter-cup..AND BUY THE RIGHT C.D.I. !..LOL.
LOL! I completely understand where you're coming from.

I go months without riding my ATV but i truly enjoy them when I do. I even picked up a Kymco 250 so my son/wife can ride with me. I would just hate to come off of the $115 only to find that there's another problem and my original CDI wasn't the root problem.

So if my 2WD Fourtrax was running perfectly last season and now has no spark, it can only be the CDI?
 

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Not to be a tightwad(but I really am so i'm not going to apologize... LOL), but this is like 10x higher than the one i bought from eBay. While I don't mind spending the money on it if this is truly the bad part, but what steps can I take to ensure that the CDI is truly bad? How can I test my original one?
there is no way to test them, they are either bad ?, or good ?. if your complaining about why you paid less for it from ebay ?, THIS SHOULD TELL YOU SOMETHING !. those aftermarket china knock-offs ARE CHEAP FOR A REASON !!. tighten your damn belt a few knotches, suck it up butter-cup..AND BUY THE RIGHT C.D.I. !..LOL.
LOL! I completely understand where you're coming from.

I go months without riding my ATV but i truly enjoy them when I do. I even picked up a Kymco 250 so my son/wife can ride with me. I would just hate to come off of the $115 only to find that there's another problem and my original CDI wasn't the root problem.

So if my 2WD Fourtrax was running perfectly last season and now has no spark, it can only be the CDI?
it's posb ?, have you ran a test on stator ?, what about cleaning/checking '' kill '' switch ?.
 

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Check for chewed wires, I have seen this when atv's see a lot of down time.

run a test on the stator and pickup coil as well.
 

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Check your coil wires. It's located just in front of the gas tank on the left side. Also try a new plug. I had mine stored for about 2 years. Fired it up and ran for a few minutes and died. Would not restart. Changed plug and it fired right up. First time I ever saw one go out with it running. Check all the wiring. Be sure to double check the kill switch. Don't ask why I recommend this. Good luck
 

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It was only down a month or so... so I don't think it's chewed wires, but it's worth a shot to look and double check.

I took a plug out of my running Kymco and it has no spark as well so there's something mechanically wrong with the Honda.

How do I check the coil wires? How do I test/clean the stator/kill switch? Are there any articles on doing that?
 

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It was only down a month or so... so I don't think it's chewed wires, but it's worth a shot to look and double check.

I took a plug out of my running Kymco and it has no spark as well so there's something mechanically wrong with the Honda.

How do I check the coil wires? How do I test/clean the stator/kill switch? Are there any articles on doing that?
start with down loading the service manual , and read up on how to do all these test. most of the test are covered in the manual. whats not covered will be how to clean the '' kill '' switch. this will require you to take the switch cover apart, and spray some electrical contact cleaner on the contacts on switch.
 

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Thanks!

Going to find the service manual now. I'll work on it this weekend and let y'all know my findings.
 

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It was only down a month or so... so I don't think it's chewed wires, but it's worth a shot to look and double check.

I took a plug out of my running Kymco and it has no spark as well so there's something mechanically wrong with the Honda.

How do I check the coil wires? How do I test/clean the stator/kill switch? Are there any articles on doing that?
You can crow about the labor you saved when the quad is running. Don’t cheap out on aftermarket replacement parts if OEM are available. Remember that fleabay sellers don’t always know what parts are compatible with model years.

Refer to service manual:
Check the spark plug number; I would change it. Don’t interchange parts with your other quad.

Diagnostics on chapter 20. Does the oil light come on momentarily and then go out?

Do you have a good battery in it?

If you suspect the CDI, inspect it. Crack in sealant, burn marks? let it come to room temperature. bake it in the oven at 200F for four hours. Not higher temp! You’re trying to drive off condensation. Connector side up. Let it cool completely. Clean the connectors with contact cleaner and a plumbers acid brush to remove old film and oxidation. Apply a thin film of permatex dielectric lube to the pins and connector shell. This will also help make connector removal easier.
 

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Moral of the story. Get wiring diagram from manual. Go over it up and do wn. Will take you a few days. Use meter in ohms setting and also volts settings to test your connections. Like others have said, you gotta start at the switch , is it getting power to cdi after switch in on position. I'd like to go on and on, but this tablet sucks typing on. Your cdi might be good. Study wiring diagram and start testing with meter. Rmatv has videos on testing stator,coil,pickup,etc,but start at the kill switch.as old as that is, connection probably bad there.
 
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