gy6 engine no spark! | It Is The Ride

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gy6 engine no spark! by: jasperp88 - Sept 17, 2017 11:53:08 GMT -5 via mobile

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Post by jasperp88 on Sept 17, 2017 11:53:08 GMT -5

Hey guys, I've been working on a kasea 150cc buggy with gy6 engine. I was able to get it running for about 10 minutes, give it some gas, it gained rpm then cut off and I haven't had spark since then. I have replaced the cdi with no luck and have done testing with multimeter on parts. One thing that is weird, I get a spike of voltage from cdi to ignition coil at initial turnover then it drops in voltage and doesn't come back. Any ideas as to what might be happening, could it be another bad cdi? Please note that I was starting it before by jumping it with a battery charger.i have also replaced ignition coil.

Stator readings
Blue/white - .5v when cranking
Blue/white - 157ohms resistance to ground
Red/black - 84v when cranking
Red/black - 363ohms resistance to ground

To ignition coil
Initial turnover - 50v-100v
Then drops to - 3v-14v
Resistance across ignition coil - 1.2ohms

Any input would be great, I'm trying to not just throw parts at it in order to fix it.

I have also removed the cvt housing and replaced a bolt with ground wires on it, do you think it's possible that I am just not getting a proper ground? I have conductivity from block to ground post but not sure if it's solid enough for the system to create consistent proper voltage

Last Edit: Sept 17, 2017 16:51:20 GMT -5 by jasperp88

UniqueSP PM UniqueSP UniqueSP's Posts UniqueSP's Threads Sophomore Rider Currently Offline THE GY6 150CC EXPERTS Posts: 150 Likes: 11 Joined: Jan 21, 2014 18:50:45 GMT -5	gy6 engine no spark! by: UniqueSP - Sept 27, 2017 9:13:30 GMT -5 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by UniqueSP on Sept 27, 2017 9:13:30 GMT -5 CDI, Ignition Coil, Stator, Kill switch. That is pretty much it for the spark. Check all, Replace them. even if you replaced the CDI the new one could be defective.
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gy6 engine no spark! by: dollartwentyfive - Sept 27, 2017 14:57:15 GMT -5

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Post by dollartwentyfive on Sept 27, 2017 14:57:15 GMT -5

jasper,
50 to 100 volts of input to the coil seems excessive to me, and quite likely has burned out the coil.

i would imagine that the CDI isn't really a capacitive discharge but instead relies on the coil to give the voltage increase.
this would imply the CDI output be a maximum of battery voltage.
i have no idea how you measured these voltage spikes with a multimeter, they are of such short duration that only an oscilloscope can detect them.

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gy6 engine no spark! by: lhumpolick - Sept 27, 2017 18:59:48 GMT -5 via mobile

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Post by lhumpolick on Sept 27, 2017 18:59:48 GMT -5

For your info jumping off a battery charger or a vehicle battery can kill your electrical system. It's because of the amps also I would check All your wires on the scooter for any burned wire
And check your fuses.

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gy6 engine no spark! by: lostforawhile - Sept 27, 2017 19:28:37 GMT -5

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Post by lostforawhile on Sept 27, 2017 19:28:37 GMT -5

Sept 27, 2017 14:57:15 GMT -5 dollartwentyfive said:

jasper,
50 to 100 volts of input to the coil seems excessive to me, and quite likely has burned out the coil.

i would imagine that the CDI isn't really a capacitive discharge but instead relies on the coil to give the voltage increase.
this would imply the CDI output be a maximum of battery voltage.
i have no idea how you measured these voltage spikes with a multimeter, they are of such short duration that only an oscilloscope can detect them.

the typical output of a Cdi into the coil is around 250-600 volts, you can't measure the full voltage output unless you have a good meter with peak hold. These are nothing like an inductive type ignition coil, these coils fire when voltage is applied, not interrupted

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gy6 engine no spark! by: lostforawhile - Sept 27, 2017 19:32:09 GMT -5

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Post by lostforawhile on Sept 27, 2017 19:32:09 GMT -5

Sept 27, 2017 18:59:48 GMT -5 lhumpolick said:

For your info jumping off a battery charger or a vehicle battery can kill your electrical system. It's because of the amps also I would check All your wires on the scooter for any burned wire
And check your fuses.

the amperage has nothing to do with it, a battery charger or a car battery is exactly the same except it has more storage capacity, no more current is going to flow in the system, then with the stock battery, voltage is the same, resistance is the same, current is the same

gy6 engine no spark! By jasperp88 (Read 3,176 times)

Post by jasperp88 on Sept 17, 2017 11:53:08 GMT -5

Post by UniqueSP on Sept 27, 2017 9:13:30 GMT -5

Post by dollartwentyfive on Sept 27, 2017 14:57:15 GMT -5

Post by lhumpolick on Sept 27, 2017 18:59:48 GMT -5

Post by lostforawhile on Sept 27, 2017 19:28:37 GMT -5

Post by lostforawhile on Sept 27, 2017 19:32:09 GMT -5

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