10-28-2020, 08:35 PM | #1 |
Join Date: Sep 2020
Location: Bluff city TN
Posts: 14
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No spark Zongshen LZX 200
Good day to all. So I am experiencing a no spark issue in which I have replaced the CDI (AC). I have checked the continuity (resistance) to the stator , CDi and rectifier and found no issues. I do not have a kickstand kill switch and all my lights work even though no spark. At this point I’m thinking just replace all electrical. Any advice. ASI have looked at spuds sticky’s for ideas and resistance values but am not having any luck. It should be worth it once I figure it out since only 4800 km on the odometer
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10-29-2020, 04:30 AM | #2 |
Join Date: Jun 2020
Location: A small country with a funny name
Posts: 164
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Are you certain you have no kill switch? As in, there's actually nothing bolted on top of the kickstand/or it's there but has been disabled/bypassed?
FWIW, I was convinced mine was non-functional, but during a recent inspection I found out it was indeed functional, only that it was bolted incorrectlty to the frame (with only one screw!) and it simply didn't reach the kickstand. Even after correctly reinstalling it however, its actuator was still too short to engage the kickstand. Last edited by ChillRider; 10-29-2020 at 09:04 AM. |
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10-29-2020, 07:17 AM | #3 | |
Join Date: Sep 2020
Location: Bluff city TN
Posts: 14
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Quote:
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10-29-2020, 09:04 AM | #4 | |
Join Date: Jun 2020
Location: A small country with a funny name
Posts: 164
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Quote:
How/where do you measure this resistance? Both sides of the ignition coil should read some amount of resistance, however this should be different at each side (CDI side should be relatively low, spark plug side should be relatively high) and, by no means, there should be any electrical continuity between CDI/spark side: the coupling should be purely inductive. If it's not, or if you read an open circuit at either side, then something has given. |
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10-29-2020, 09:33 AM | #5 | |
Join Date: Sep 2020
Location: Bluff city TN
Posts: 14
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Quote:
FYI to get my resistance readings at the spark plug connections I placed the black prong on a bolt grounded to frame and inserted the red and readings were shown I cannot recall exactly the numbers. I will have to perform again and write them down. Thanks for all the help ChillRider. |
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10-29-2020, 10:03 AM | #6 |
Join Date: Jun 2020
Location: A small country with a funny name
Posts: 164
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Needless to say, to measure the coil or any other electrical component of the bike, especially one that may attach (or short...) to the ground/common or be connected in parallel with other components, it should first be removed/isolated from the bike.
However, usually ignition coils are electrically connected to the ground on both the input (+12V) and output (spark) side by design, so in that case you must measure both sides with reference the common ground without removing anything, except maybe from the CDI unit. You should still get two different resistances at each side (Ri + Ro), and measuring the resistance directly between input and output (no ground) should give you their equivalent series resistance (Rt = Ri + Ro). If Rt is significantly lower than the sum of Ri + Ro, then you have a short between input/output. Also, if either Ri or Ro is infinite, then that side has failed open. It is also possible for the output side to fail closed (0 Ohms relative to ground, aka shorted). |
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