01-04-2019, 01:30 PM | #1 |
Join Date: Jan 2019
Posts: 5
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STILL no spark
HELP!! I am trying to get a 48cc quad running for my grand children. It had a lot of extra wires on it(someone had torn out the remote system). I removed all the extra wiring and switches, replaced every electrical component except the solenoid, and rewired it back to the very basic design needed to run. Problem is, I can't, for the life of me, get ANY spark out of it. Didn't replace the solenoid because it turns over fine, and solenoid doesn't affect the spark. Am I missing something really simple?? I've checked out every diagram I can find, I am at my wits end. This was supposed to be ready for Christmas, and I have spent days trying to get spark. I visually matched up every part I bought. Anything you could suggest would be greatly appreciated. Thanks in advance, David
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01-05-2019, 12:32 AM | #2 |
Join Date: Jun 2016
Location: Myrtle Creek Oregon
Posts: 873
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Hi,
I’d start off with a google search for Basic wiring diagram chinese This will give you some indication of how the system works. Gotta have a good pickup coil, which is probably under the flywheel (sometimes not tho), a good ignition coil and a good CDI box, and the wiring then has to be correct. A OHM/Volt meter is a good thing to have to Verify kill switches, key switches, and whether voltage is getting to where it’s supposed to be. Also a brand new spark plug, and, also, make sure the spark plug boot assembly is good and screwed on the wire correctly.
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1988 Kawasaki KLR250 1969 Honda Z50 silver tag 2002 Ford F-350 7.3 diesel 1975 Corvette 2017 Chevy Bolt “Throttle twisting geek” -LFN |
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01-05-2019, 09:28 AM | #4 |
Join Date: May 2018
Posts: 1,639
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2 or 4stroke ?
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01-06-2019, 08:28 PM | #5 | |
Join Date: Jan 2019
Posts: 5
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Quote:
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01-06-2019, 08:33 PM | #6 |
Join Date: Jan 2019
Posts: 5
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Thanks, but I put in a new coil, stator with pick up coil, CDI, voltage regulator, and bypassed all the unnecessary switches. The only thin left, I think, is that one of the new parts is faulty. I need to test them, but don't know what numbers to look for.
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01-06-2019, 08:34 PM | #7 |
Join Date: Jan 2019
Posts: 5
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01-06-2019, 09:49 PM | #8 |
Join Date: Jun 2016
Location: Myrtle Creek Oregon
Posts: 873
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Well, let’s see.. start with the pickup coil, under the rotor or wherever it is (for example on my old XR600 it was on the other side of the engine all by itself). I think when the engine is spinning over, some kind of voltage should be being produced, in spikes, every time the magnet crosses the pickup. Probably AC current. Validate this and don’t really worry about the actual Voltage (don’t accidentally check the lighting coils). Then, verify this signal is getting to the cdi. On the other side of the cdi, at the coil, there should be a voltage, but again, not too worried WHAT it is but again, it should be (I think) a fluctuating voltage and probably AC. Although there are DC CDI’s too... I’ve seen them and when buying them you have to pay attention to the difference. At that point, if there is voltage all the way to the coil and it seems to be reasonable (by the way, search for how to test more common bikes like Suzuki or Yamaha to get a close test voltage maybe since the Chinese ones are missing or vague), then test the coil. Coils usually have a standard type of test so again, use a Japanese bike testing voltage and/or closed/open between the 2 or 3 wires (varies from different bikes). That’s about it! Other than switches, and bad wires, a pickup coil, a CDI doing the right thing and then a good coil, good output lead, good cap and a good spark plug should give you spark.
Also, bad grounds, and also, kill switches usually ground out the CDI so check to make sure those aren’t grounding out things when they are not supposed to.
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1988 Kawasaki KLR250 1969 Honda Z50 silver tag 2002 Ford F-350 7.3 diesel 1975 Corvette 2017 Chevy Bolt “Throttle twisting geek” -LFN |
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01-07-2019, 12:33 AM | #10 |
Join Date: Jun 2016
Location: Myrtle Creek Oregon
Posts: 873
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Here’s a very basic picture of the wiring I just found on here...
https://www.bing.com/images/search?v...x=63&mkt=zh-CN
__________________
1988 Kawasaki KLR250 1969 Honda Z50 silver tag 2002 Ford F-350 7.3 diesel 1975 Corvette 2017 Chevy Bolt “Throttle twisting geek” -LFN |
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01-07-2019, 12:39 AM | #11 |
Join Date: Jun 2016
Location: Myrtle Creek Oregon
Posts: 873
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So, make sure the smaller plug, with black and red: black not grounded. Red, has 12 volts.
Then, make sure there is a pulse from the pickup coil. Then, make sure that there seems to be 8-12 volts Pulse at the coil? I think maybe it’s 8 but can’t remember... I think there are ways to trick the coil into sparking. I think it’s by using 8 volts directly to the coil input wire and quickly brushing it with the voltage. This should create a spark at the plug, but I could be wrong on that... also, a magnet run over the pickup coil should creat a spark too, at the spark plug, if all the other things are hooked up right.
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1988 Kawasaki KLR250 1969 Honda Z50 silver tag 2002 Ford F-350 7.3 diesel 1975 Corvette 2017 Chevy Bolt “Throttle twisting geek” -LFN |
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01-07-2019, 09:06 PM | #12 | |
Join Date: Jan 2019
Posts: 5
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Thanks for the link
Quote:
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01-07-2019, 09:44 PM | #13 |
Join Date: Jun 2016
Location: Myrtle Creek Oregon
Posts: 873
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Welcome! I just stumbled on that link reading someone else’s electrical issues last night. I had to fix my Roketa (former bike) and it was the CDI box. After all the old motorcycles I’ve had I’m getting fairly good at electrical troubleshooting... keep us posted as to results!
L
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1988 Kawasaki KLR250 1969 Honda Z50 silver tag 2002 Ford F-350 7.3 diesel 1975 Corvette 2017 Chevy Bolt “Throttle twisting geek” -LFN |
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