I have a 1999 Honda TRX450ES that only starts and idles when you let off the start button. If you pull the plug out and crank it it only sparks when you let off the starter. When running if you give it gas it dies. I have replaced the pulse generator, CDI box and checked battery voltage and connections. Has anybody else had a similar problem and what is next to check or do? Thanks in advance for any help.
TRX450ES sparks only when you let off starter
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Sounds like you may have a bad ground somewhere. Welcome to the forums!
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I didn't even think about the coil. But wouldn't the cut in speed of the stator be to high to have any effect? Just trying to learn something.
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Maybe, but I've seen them do some weird things. My money's on the ignition coil, though.
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Yep since you mentioned it i'm with you. But you know a lot more about this stuff than I do. Remember I went to first grade twice!:icon_ cry:
Thanks for more idea's. I will try to check out the coil next. Doe's the stator assist in the firing of the plug or just in the charging? I thought the pulse generator was the only thing inside the rear case that would affect the firing. But I don't know just asking?
Ok just looked at a wiring diagram and I see that the green wire going to the coil goes to the frame ground. Checked it and it has good ground. The black wire with yellow tracer goes from the coil to the CDI box. Should this have some kind of voltage with the key on or while cranking? It's not really showing any voltage. I have tried a new CDI box and it does the same thing. Confused Again!!!
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In addition to charging, the stator generates the power for the spark. The pulse generator is just a hall effect sensor that signals when to fire, but when it goes bad, it usually won't fire at all. I would check the ignition coil first.
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Agree^^^^^ checking the voltage at the coil is difficult sometimes it's much easier to OHM it out just connect one lead to ground and the oother to the black/yellow terminal you should see I think around .08 OHMs to .12 OHMs and then check between the sparkplug end and black/yellow for a readin I don't know what they are supposed to be check your service manual or Helmut may have some numbers for you. good luck.
Just installed a new coil and have the same problem. Any way to check the stator before I go purchasing it?
Thanks for all the help. When I finally do find the problem I will be sure to post what fixed it so maybe somebody else won't have to go through all this.
Thanks for all the help. When I finally do find the problem I will be sure to post what fixed it so maybe somebody else won't have to go through all this.
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i don't have any spec's for that bike either...but..to answer your question..yes..you don't have to remove the stator to check it..just unplug the harness for it..with a ohm meter..you can check it that way....i bet your stator is bad...i know you said you replaced the c.d.i..buttttttt..did you replace it with the same year and make ?..they have to match perfectly !..or they won't work right.
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Now this trx450es is in my shop. I have checked grounds, new ignition switch, and still has problem. I remember in the mid 90's, Honda had the same problem with there trx 300 model whch required a new cdi box to fix. But a new cdi box did not fix this one. Someone must have run into this before. What can it be?
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