12-04-2009, 05:34 PM | #46 | |
Join Date: Dec 2009
Posts: 4
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I have a Roketa 50cc quad, the same electrical system as this thread. Today I ran down and got another CDI unit, hoping this was the problem, but no luck. Then I found this thread. I did as mentioned, and the kill switches are ruled out. (EDIT) Forgive my stupidity, tested wrong pins originally. :oops: The power supply voltage to the CDI, measured when cranking, is around 46 volts, could be more if the battery is fully charged. Timing trigger registers 5.3 volts, and a resistance test on this pin is 0.5 ohms. Ground pin checks ok, kill switch checks ok, and the ignition coil pin shows no voltage. Any ideas? Thanks! |
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12-04-2009, 06:36 PM | #47 | |
Join Date: Dec 2009
Posts: 4
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12-05-2009, 12:32 AM | #48 | |
Join Date: Aug 2008
Location: Tracy, California
Posts: 83
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1) 0.5 ohms on the timing trigger pin is way too low. It should be more like 150 ohms. 2) 5.3 volts AC on the trigger pin is way too high. It should be more like 0.3 to 0.5 volts AC Down around your stator there is a group of wires that come out of the engine (from the stator) and tie into the wiring harness. Is there any possibility that these may have been miswired recently? Measure the resistance of all the wires to ground at the stator output connector(s). Do any of them read around 150 ohms? What I'm wondering is if the battery charge winding in the stator is wired to the trigger input of the CDI. It's resistance and output voltage at cranking speeds is a lot closer to what you measured for the trigger pin then the expected trigger voltage and resistance. You may want to measure the trigger voltage and resistances again just to be sure you get the same values. And remember that the picture of the CDI pins is mirror imaged from the mating pins in the wiring harness since you have to flip the connector over to look into the pins. |
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12-05-2009, 10:23 AM | #49 |
Join Date: Dec 2009
Posts: 4
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As for the measurements, I double checked and still have the same thing.
The 3 wires coming out of the stator, a couple of them are very small in resistance, around 0.5 ohms, the other is around 330 ohms. As for messing up a wire - it's possible. The 4 wheeler ran fine, then one day it had power issues, so I jiggled the wires around and checked all the connections. Possibility that I got one wrong, I don't know - it's been 6 months since I fixed that issue, and just haven't gotten around to fixing the spark problem. That power problem was at the fuse, just a bad connection. |
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12-05-2009, 12:25 PM | #50 |
Join Date: Dec 2009
Posts: 4
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Lynn, I and my kids very much appreciate your help. With your insight, I pulled the stator off and traced where the timing trigger wire was going. Come to find out two of the wires WERE backwards. After moving them to the proper place, I have a spark.
Now to try adjusting the carburetor so I don't have to crank it for 15 minutes in the cool air to start it. I think I'll clean up the wiring too. :wink: Thank you! |
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12-05-2009, 10:03 PM | #51 |
Join Date: Aug 2008
Location: Tracy, California
Posts: 83
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TallGuy, I'm glad you were able to find the problem.
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08-14-2011, 06:38 PM | #52 |
Join Date: Aug 2011
Posts: 1
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first off, this forum has a tonne of great info!!
I purchased a gio 110 mini hummer the other day, I drove it around the yard for probably 10 rides without an issue, parked it by the front door and came inside. Went back out an hour later and it wont start! Tested the CDI, AC ignition power is within range, timing trigger is within range, CDI is grounded, kill switch ruled out but I have 0 volts on the ignition coil wire when I turn the engine over, does this mean a bad CDI?? |
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